Posts: 677
Registered: ‎09-04-2012

Low Power Idea Contest: Submit your ideas here!

[ Edited ]

Submit your low power ideas (max. 2 ideas per user) in the comments below by September 26th, 2015.  Our internal jury will select up to 30 submissions, and the winners will receive a free EFM32 STK ($67 USD). Compare different EFM32 STK options here.


View Judging & Winner Announcement Information Here  



By entering the contest, you acknowledge that you have read and agree to the Community Contest Terms and Conditions 

Nari | Community Manager | Silicon Labs
Posts: 63
Registered: ‎04-14-2015

Re: Low Power Idea Contest: Submit your ideas here!

Adaptive, Gridless Yard Solar Holiday Lighting Controller


I want to use the EFM32's Low Power Features to sequence holiday light decorations in our front yards, off the grid. With the increased success in solar lighting in recent years, it makes a lot more sense to set up yard decorations without connecting to a 120V or 220V electrical outlet. This completely removes the risk of electrocution from stringing electrical wire through the snow. Additionally, this is cheaper, more energy-efficient, and a lot easier to set up. However, it means we have to find other means to power the lighting, such as batteries or solar.


The EFM32's Low Power features will be used to reduce power consumption not just in the CPU itself, but—more importantly—in the lighting. When lighting displays are sequenced using a microcontroller, they not only look better, but they also consume less power. Power consumption can be monitored and rationed using a variety of methods through the EFM32 controller:


  1. Go into Shutoff Mode when ambient light exceeds a threshold for a prolonged period. It is assumed that this is because the sun is up. Thus the display should shut off.

  2. Go into Sleep Mode and turn off the lighting when ambient light exceeds a certain threshold for a short time. This could come from a car's headlights, or other man-made light source outshining the display.

  3. Adapt light sequences based on how much battery is left. Some sequences consume less power than others.

  4. Ration out power to last for a targeted amount of time. For example, we may only want yard ornamentation lit from 18:00pm to 23:59pm at night, because no one is even out on the roads after midnight.

  5. Adapt solar lighting's power consumption based on how much sunlight the solar cells got that day. Some days are sunnier than others. Some places—such as Oslo—get very little sunlight during Christmas time, but during the summer it is the opposite: it is almost never dark.

  6. Initiate more lively, but more power-consuming sequences when a motion or IR sensor senses movement—since it is more likely that passersby are actually viewing the display.

  7. Automatically notify the owner of the yard display that power is running low: the minimal lighting sequence will convey that.


This application takes advantage of the following Low Power features of the EFM32:


  • LESENSE. The CPU needs to monitor ambient light, motion sensors, and the 24-hour clock during the majority of the time while it is asleep.

  • Fast wake-up time. The lighting display turns quickly on-and-off when motion is detected, or when other lighting (such as auto headlights) temporarily outshines the display.

  • Peripheral Reflex System. Some simple lighting operation can actually occur while the CPU is asleep, during periods when very little power is available.

  • Multi-level sleep modes.

  • The Voltage Comparator. Required to monitor available battery power.


Do note that, in spite of the Low Power Contest falling right around Christmas, this application by no means is limited only to Christmas lighting. Indeed, the hope is to develop a software library in Simplicity Studio so that others can adapt their own wireless displays, with their own sequencing, to the EFM32.

Posts: 1
Registered: ‎09-15-2015

Re: Low Power Idea Contest: Submit your ideas here!

Considering the very low power operation that EFM32 makes possible, I came up with an idea for using it on a solar energy converter. The concept is to make it the controller of a buck-boost converter, allowing for energy harvesting from low voltage solar cells.

The input voltage from a string of solar cells would be something between 1 volt and 6 vols, and the output voltage would be 5 volts fixed. Using all the processing power of EFM32 makes it possible to achieve a fast control loop, while keeping the system power consumption very low. It is important to keep losses low (thus an efficient and fast control) to drive the system efficience up.

The application for this energy converter ranges from remote locations weather stations to sensor nodes and also security and monitoring.

Posts: 1
Registered: ‎09-18-2015

Transfer Energy[Crazy Idea]

i want EFM32 STK low-power device to transfer energy with the help of iot.

Transfer energy to another continent.

[we could make electricity from even wifi signals].Why could we share those energy

Nari wrote:

Submit your low power ideas (max. 2 ideas per user) in the comments below by September 26th, 2015.  Our internal jury will select up to 30 submissions, and the winners will receive a free EFM32 STK ($67 USD). Compare different EFM32 STK options here.


View Judging & Winner Announcement Information Here  



By entering the contest, you acknowledge that you have read and agree to the Community Contest Terms and Conditions 


Posts: 2
Registered: ‎09-20-2015

Low Power Ambient Environment Sensor Network

My idea is to develop an ambient environment sensor that measures lighting levels,
proximity, temperature and humidity and reports the current status over a NRF24L01
based 2.4GHz wireless network to a base station. The sensors are battery powered
and can be deployed both inside and outside of the house.


The information gathered by the sensors can be used to monitor and adjust for
environmental conditions (by monitoring the light and temperature levels in a
garden for example) and provide triggers to automate other processes (turning
off the lights in a room if it has been unoccupied for a certain amount of


The sensors will be battery powered and my goal is to be able to power a sensor
from a single 2000mAh AA battery for 6 months. This requires the average current
consumption of the sensor to be less than 150uA over it's operating period. To
achieve this goal will require very careful power management.


The design uses a number of Silicon Labs products including:


  • EFM32 Cortex-M0+ Microcontroller
  • SI7054 Temperature/Humidity sensor
  • SI1141 Ambient light and Proximity sensor

All of these products can operate with very low current draws which will aid in

meeting the target. In addition the LESENSE features of the EFM32 will allow
for additional sensor inputs (such as soil moisture) to be added in the future
that can be activated and read while the CPU remains in low power mode.


Posts: 4
Registered: ‎08-28-2014

Re: Low Power Ambient Environment Sensor Network

My Idea is to develop an EFM32 + BLE based name card, with E-Ink display.


This name card will be carried out by a people, put it into your pocket and show them to customers, and the BLE will start to advtising, so your customer can use smart phone to receive these infomation, include:


Company Profile


Contact People

Telephone Number




As the name card will have a display, so it can can also be directly display your info on it, like name, contact info, title. And the name card can be weared in your clothes, so when you go into a bar, if the server wear the name card, it can let customer know the name, and let customer know the QR code, which is good for biz development.


As the phone can connect to the name card, the phone capble of changing the display image any time any where, so the name card also can become a note for transfer infomation between family members, collegues, etc.


EFM32 low power features and E-Ink display reference design is right fit for this application, also the GigaBlue BLE module can accelerating the time from idea to prototype, and finally to market.


How it can be achieved:


EFM32 + Giga BLE Module + Si114x Light senor



Posts: 2
Registered: ‎12-09-2014

Re: Low Power Idea Contest: Submit your ideas here!



A Smart Farm

My idea is to develop a smart farm system that uses EFM32 with battery powered. It measures temperature, humidity and soil moisture. The measurement results will be sent included battery energy level to a base station through XBee IEEE 802.15.4 if the threshold values are achieved, such as high temperature, low humidity or low battery energy. A decision to send a report to a base station uses Fuzzy approach. Some rule set are defined to build Fuzzy control system for a smart farm.


By utilizing LESENSE features on EFM32, a smart farm system works with efficient energy consumption. After acquired data from sensor, a smart farm system analyzes the data using a Fuzzy controller. If no decision to send data, EFM32 will sleep. Otherwise, it sends the data to a base station.

The following is required hardware modules:
* EFM32
* Two XBee IEEE 802.15.4 modules
* Temperature and humidity sensor module
* Soil moisture sensor module


Posts: 1
Registered: ‎09-21-2015

Re: Low Power Idea Contest: Submit your ideas here!



This project is related to wearable electronics.


A series of LEDs are sewn to a vest and then laminated for waterproofing. It is intended to be worn by motorcyclists, traffic enforcers, police officers, construction workers, or anybody who needs to be visible in challenging light conditions for safety purposes. Examples are working during the night or in a foggy environment. It will be powered via a Lithium-polymer battery so it's rechargeable and lightweight. It will employ accelerometer, gyro, and magnetometer (all MEMS) to detect body position at any point in time. The vest also has an embedded low-energy Bluetooth (BLE) that will enable it to connect to the smartphone carried by the person wearing the vest so when an impact condition is detected (by interpolating data from the IMU sensors), it will automatically send a text message or initiate a call to an emergency hotline number (or to any number set by the user), indicating the location by giving the exact GPS coordinates from the smartphone's GPS.


I believe that the EFM32 Cortex-M0+ Microcontroller is the most suitable controller for this project. It can execute processor intensive algorithms at far less the energy than executing the same algorithm on an 8-bit or 16-bit micro. This is very important as I will be running some sensor fusion algorithm to continuously monitor and interpret the data from the IMU sensor. Another feature that I like with the EFM32 is that it does offer different levels of sleep modes, which will allow me to optimize energy consumption on the little Li-Po batteries that I have to embed in the vest. I can use the LESENSE for monitoring the ambient light to tell when the vest should be "active" so the LEDs and the system is automatically turned on when a particular ambient light level is reached. In this concept system, the major energy consumers are the LEDs. The intelligence of the EFM32 microcontroller would allow me to save energy on other aspects of the system. The advantages offered by Simplicity Studio for energy profiling would be of great help in evaluating the energy consumption of the micro as I run the algorithms while monitoring a multitude of sensors and controlling external IC's.


To wrap up, this project is intended to involve the following as major components:

1. EFM32 Cortex-M0+ Microcontroller

2. 9-DOF sensor

3. BLE module

4. Ambient Light Sensor

5. Li-Po Batteries

6. LEDs

7. Temperature and Pulse Oxymetry sensors (future enhancement)


Thank you.

Posts: 1
Registered: ‎09-22-2015

Smart Motorcycle Navigation System

I'd use a SIlabs EFM32 to power a smart navigation system for cycles and motorcycles. The system would use EM3 or Stop mode the majority of the time, taking interrupts from an accelerometer and some sort of crash sensor.


The device would feature the following functionality

1. Implement an anti theft feature for when you park your bike. Stop mode would be perfect for something like this, connected to a bluetooth 4 module.

2. Implement crash detection and automatically inform first responders in the area.

3. During a ride, it would use sleep and use bluetooth to communicate with a users phone as well as briefly turning indicator leds on and off for navigation.


This would use a lot of LESENSE optimization as its entire purpose is to collect information from various sensors and pass them onto a phone and vice versa.


Thus, because of the EFM32 it will be extremely low power

Posts: 9
Registered: ‎09-22-2015

Re: Low Power Idea Contest: Submit your ideas here!

Industrial Automation Process Data Display


In many automated industrial facilities process information is transmitted to a central location. This information is available in a local HMI (Human Machine Interface) that usually is located several hundred feet from instrumentation.

When maintenance personnel work on some of the instrumentation, they typically have to move back and forth from the location they are working at and the local HMI to check process values or check values via radio with the operators. This common design is to reduce costs of having local indicators on the instrumentation and to require cabling power to some of these locations that may be hazardous.


The low power features of the EFM32 allows creating a very small all included (even power) device that can be installed really close to instrumentation to display process data right on the point where it is produced.


A very small board, based on an EFM32, completely encased in epoxy, with its own power enough to last several years and only having a pair or RS485 terminals can be glued in top of any device, for example a pump. When a user comes near the pump, just touching the device will make it wakeup, communicate with the PLC or device that contains the data and show it in the screen.


So, the proposed device is a completely encapsulated device with a LCD screen and battery with a few exposed wires. Wires would allow communicating with instrumentation devices using: Modbus over RS485, 4..20mA current loop sensor with HART protocol.


The features that make the EFM32 important for this application are:

            LCD Screen handling capability

            LESENSE based low power capacitive sensing for user interface

            UART for Modbus Communication over RS485


Because of the large integration of function in the EFM32 this project can be made at a very competitive cost that will make it very attractive in industrial installations.


Posts: 2
Registered: ‎09-22-2015

Interactive Music Toy

Interactive Music Toy


This proposal involves a series of conductive stickers that can be glued to the walls. Each sticker is connected to a small EFM32 based board with a small non-user replaceable battery. When any of the conductive stickers is touched, the capacitive sensor of the EFM32 detects the touch and sends a code via IR (Infrared).


Another EFM32 based device that contains an IR sensor is able to detect the touches and makes a sound in response to the sticker touch. The system is fully configurable, including the sounds played and or even the IR codes sent.


The full system could be configured to convert entire rooms into musical instruments or remote controls of devices like TVs. For example a big button on a wall can be linked to a power on command over IR or some logos can be configured to change channels to a specific channel.


Furthermore more sensors could be added to implement things like turning on lights.

Posts: 2
Registered: ‎09-22-2015

Low Power Idea Contest: Portable Baby Habits Log

Portable Baby Habits Log


During the first months of a baby life, it is very important to log feeding and diaper use. This is an easy to forget task that becomes complicated because of the multiple activities involved in caring a baby.


This project idea is to create a small device that would be attached to the baby and would have a small screen and several capacitive buttons. Every time a button is pressed for a long press, that specific activity will be logged. A short press will show the last time of the activity and how many times has been done in the last 24 Hours.


This project involves using an EFM32 with a Memory LCD. For baby security reasons the unit is completely encapsulated in a plastic case. Battery is not removable and thanks to the EFM32 low power consumption, battery should last several months.


Additional features could be added to the system like temperature logging and movement detection.


The EFM32 is perfect for this application because of the Low Power consumption and capacitive sensing capabilities.



Posts: 34
Registered: ‎09-11-2012

Re: Low Power Idea Contest: Submit your ideas here!

I would use the EFM32 to build a self-power battery checker.

When one wants to check the state of lets say an AA cell, its just very accurate to use a multimeter - due to the internal resistance one needs to apply a certain load to get good result. Doing so makes the measurement procedure more awkward, and its requires a multimeter (which in turn needs batteries, thats need to be checked ony in a while...)

So my idea is to automate that, and to power the battery tester from the battery that is about to be tested (so it doesn't need its own one).

When a battery is inserted into the tester, a low-power low-voltage boost converter creates about 3V from the battery, and also fills a reservoir capacitor (for about a second or so). Then the EFM32 is started so it can do several measurements (without load, with 30mA, and with 120mA). From these measurements it can calculate the real battery state (battery voltage under load, and percentage of charge left).

The low power usage of the EFM32 together with the capacitor ensures it still works even with the battery voltage dropping totally under load (which includes even the load created by the EFM32 itself).

To err is human, to forgive is against company policy.
Posts: 10
Registered: ‎03-26-2013

Re: Low Power Idea Contest: Submit your ideas here!

I want to use the EFM32 at  a test bench for testing of communication devices (see picture here under). The EFM32 is connected via the DAQ (Data Acquisition) card to the device being tested. Also this DAQ board is connected to a PC running the test program. The different bus protocols of communication device such as RS485, I2C, and CAN are tested by the DAQ card using the EFM32 to monitor the measurement sensors data and display it on screen.



Posts: 4
Registered: ‎12-10-2014

Re: Low Power Idea Contest: Submit your ideas here!

I would like to use the EFM32 to build Portable All-in-one Measuring System.
The system can be used as:
- Multimeter (voltmeter, ammeter, ohmmeter),
- Function generator,
- Simple oscilloscope,
- Spectrum analyzer,
- Logic analyzer,
- Protocol analyzer for SPI, I2C, CAN, LIN.
Signals will be connected to analog processing board with additional high speed analog to digital converters (ADC), digital to analog converters (DAC), programmable gain amplifiers (PGA) and GPIO isolators.
To access the virtual instrument (e.g. oscilloscope) user can be used PC or a built-in touch display with optional keyboard.

Posts: 2
Registered: ‎09-25-2015

Re: Low Power Idea Contest: Submit your ideas here!

Industrial Data Logger with USB interface


The idea of this project is to use an EFM32 processor to implement a Digital/Analog data logger able to record signals using the LE Sensor interface using minimum power. A Data logger like this would be very power efficient and could be packed with a very long lasting battery.


Furthermore using USB to retrieve the logged data, it would be possible to charge the battery while is connected to USB and this way completely avoids having to replace batteries.


While connected via USB the data logger will become a Data Acquisition system that due to the extremely low power consumption could be connected to a cell phone, allowing it to process field signals.

Posts: 1
Registered: ‎09-25-2015

Re: Low Power Idea Contest: Submit your ideas here!

Wireless sensor networks

My idea is to develop a wireless sensor network (WSN) to monitor environmental conditions (pressure, humidity, temperature).
Each node is connected to one sensor and has several parts:
* EFM32 microcontroller,
* RF transceiver
* battery

Driver assistance system

I'm working on driver assistance system designed to avoid collisions and alert the driver to vehicle problems.
I want to connect the MCU board to a vehicle via CAN bus.

Proposed system should consist of the following hardware modules:
* EFM32 board,
* OV7670 camera module
* LCD with touchpad
* CAN transceiver and controller module
* L80 GPS module
* SIM900 GSM/GPRS modem
* USB 3G HSPA modem
* L3G4200D 3-axis gyroscope module
* MMA7455 3-axis accelerometer module
* IR emiters and sensors

Major features of the proposed system:
* Route logging
* Crash detection
* Driver drowsiness detection

Posts: 1
Registered: ‎09-25-2015

Re: Low Power Idea Contest: Submit your ideas here!

Low Power Violin Tuner (EFM32 DSP demonstrator).


I want to use the EFM32 Wonder Gecko to build a violin tuner that will demonstrate low power features of the EFM32 for DSP applications. Audio will be sampled from a microphone and the system processor will use FFT to find the strongest frequency components of the signal. A display will show the nearest musical note and indicate how close the sampled frequency is to the target for that note. The tuner will be battery operated so low power is extremely important. Current violin tuners have about a 30 hour battery life. Using the low energy features of the EFM32 I conservatively estimate a 45 hour battery life.


The primary purpose of this project is to demonstrate how to use Timer, ADC, and DMA peripherals with the Peripheral Reflex System to sample audio signals in Energy Mode 1 while using Energy Mode 0 to process the sample window and update the display.

Posts: 2
Registered: ‎04-07-2015

Re: Low Power Idea Contest: Submit your ideas here!

My summer house (chalet) battery source supervisor.


I had a chalet behind my city where there is emergency battery powered heating pumps and control electronic required not to be out of power. There is big Pb accu involved. I would use low power features of EFM32 to monitor condition (state of charge) of accu by measuring discharge current from the accu and calculating remaining energy considering also ambient temperature. If a level of estimated energy in accu is below a critical level, an EFM32 control module would transmit an emergency message to me (by GSM) to come for a rescue. It is very important not to draw much power to measure energy in accu so LESENSE technology would be perfect. There is also need to model a math characteristics of discharging accu in EFM32 and use of its DSP instructions.

Posts: 2
Registered: ‎02-27-2015

Re: Low Power Idea Contest: Submit your ideas here!

My Idea is to develop an Greenhouse Monitoring for Tomato Plantation and using EFM32's Low Power Features is perfect for this project.

The system would be battery powered and it will take advantage of the Low Power features of the EFM32 such as LESENSE and the voltage comparator.
The system will be composed of a EFM32 Cortex-M0+ microcontroller and it will measure temperature and humidity using a SI7054, light levels and UV index using a SI114x sensor and carbon dioxide levels using COZIR Ambient low power sensor.

All the gathered information will be sent to a central computer via sub-GHz radios to achieve higher distance and lower power consumption.

I think that the EFM32 is perfect for this application because of the Low Power Features.

Posts: 3
Registered: ‎02-28-2015

Re: Low Power Idea Contest: Submit your ideas here!

Hello everyone!


My idea is to reinvent the smartwatch. The current smartwatches have bad battery lives and nowadays people don't want to charge their watch every night. What's more, my smartwatch doesn't have any buttons and even no touchscreen! It will use the Si1147 sensor for 2D gestures and the housing of the watch will be a select button (capacitive touch button).

To make that smartwatch which can also last more than a day on one full charge, it needs to be very low-power. That's why I need the SiLabs microcontroller, because it consumes little power and has many advanced sleep modes and in addition to that, it also has LESENSE and Autonomous peripheral operation.

So in this smartwatch I would like to use these components:

  • Happy Gecko MCU
  • Si1147
  • Low-power Memory LCD
  • Temperature sensor
  • And of course a battery

The MCU will update the display every second so that the user always sees the current time and because a temperature sensor will be used, the user will be able to see the temperature. The best option would be an analog temperature sensor, because in that case, I could benefit from the LESENSE feature, it would only adjust the temperature on the display when it really changes and that will save some precious power.

The Si1147 will be used for interfacing with the smartwatch with 2D gestures. For example: swiping left and right to scroll through options and select by touching the smartwatch. That will eliminate the need of physical pushbuttons and a touchscreen, which is not very practical on such a small device.

One other thing that I dislike in the current smartwatches is the fact that they're very thick. It's not a big problem, but it's always nice if the smartwatch is thin and with these components I think I can create the world's thinnest smartwatch! The display is really thin, and all components are available in small smd packages which I can place on a thin pcb.


To make this happen I need to check everything in real life and make some prototypes and write the code, that's why I need the Gecko Board. I can use it to create this project, but I have some other cool ideas on my wishlist Robot Happy


Have a nice day!

Posts: 5
Registered: ‎09-26-2015

Re: Low Power Idea Contest: Submit your ideas here!

I want to create with a use of an EFM32 processor an alarm system. This system will be installed in a house which is uninhabitated during the winter. Thus it should be battery powered and has a possibility to send messages with a state of an object on its own.

The heart of the system will be an EFM32. The system will consist of several sensors like:

- PIR motion detectors

- switches installed in window and doors

- camera - it is the main part of the system. Before i call the cops i need to know what exactly is going on - so i have to get a picture from the house.

Because the system will be battery powered, one of the main factor is low power consumption. In general, iIt is hard to lower the power consumption of sensors (but i have some ideas how to do this), so i focus on lowering the consumption of the main unit.

To do so i plan to use a LESENSE interface from the EFM32 processor. For the most of the time the processor will sleep - and all sensors (except camera) will be connected to this interface. If something will happen (the motion will be detected, the switch will be switched-on) the processor will be awake. Then it will turn on the camera, make some photos and send them to the cloud server using a GSM module (it might be a popular SIM900 module). Simultaneously the pictures will be stored also on a local storage (flash or sdcard). After sending photos the system will wait for the decision what to do - i plan to connect to it also a siren which will be tunred on based on a message sent by me through a network.

To lower the power consumption in this stage i plan to change dynamically the speed of the processor. When the system will do more complicated tasks - the clock will be higher. While the system will wait for command - the speed will be reduced.

You may ask why an arm processor must be used in such design. I decide to use it because it has enough power under the hood to perform simple image processing which can be used to decide what exactly is going on - based on pictures from the attached camera.

  Best regards

Posts: 1
Registered: ‎09-26-2015

Re: Low Power Idea Contest: Submit your ideas here!

Personal GPS and Environmental Data Display and Logger for Hiking and Wilderness Exploration


The EFM32 starter kits' low power consumption and processing capabilities are perfect for long trips out of town where battery life is crucial and a cell phone cannot obtain reception.


The hand held device will make use of the start kits' buttons for interaction, and the LCD for displaying data obtained from the on board barometric, atmospheric and GPS sensors.  It will also log all data gathered on an SD card.    The LCD will also be used to display the current time and date.  The low power consumption of the EFM32 means the device can stay active.  And using the GPIIO, the GPS module can be deactivated when not in use to further save power.  


The EFM32 will have the following peripherals:

-SD card on the for data logging (SPI) 

-Barometric pressure sensor (I2C)

-Atmospheric pressure sensor (I2C)

-Low Power GPS module (UART)




<a href=""><font color="#000000"><font size="2">Hero Employee</font></font> </a> Alf
Posts: 280
Registered: ‎09-06-2012

Low Power Idea Contest Winners Announcement

[ Edited ]

Thanks a lot for all the good ideas coming in. Obviously we’ve done a good job in educating you, as you seem to have very good understanding of the EFM32 low power capabilities!


Below is a short comment from the judges, along with the board we want to send you. All winners will be contacted directly via email in order to arrange the shipping. If we’ve misunderstood your requirements, please let us know what kit you want when you reply to our message. If you have any questions, send an email to

So, here goes:


@mapleleafs - Adaptive, Gridless Yard Solar Holiday Lighting Controller

Very good explanation and project description. Excellent understanding of the EFM32 capabilities. Sending the EFM32LG, as this has LESENSE and enough flash memory for your application.


@clovisf – solar energy converter

Interesting application. Sending the EFM32ZG as it has a single-cycle I/O interface and very low active current consumption.


@TheGarageLab - Low Power Ambient Environment Sensor Network

Excellent description and an application where we have a very high market share. Unfortunately we do not have devices with M0+ and LESENSE, but as both the sensor you reference are based on I2C, we want to send you the Zero Gecko with a weather station board, containing both RH+temp sensor and light sensor.


@cplmaomao0 - EFM32 + BLE based name card

Good understanding of what it takes to build a low-power tag. Sending the EFM32ZG as this is the lowest power device in our family.


@agusk - A Smart Farm

Good description! Sending the EFM32TG as this is our most popular device in metering applications that require LESENSE.


@Ruch – Intelligent Safety Vest

Very cool project! As you note, the LEDs will be the main drivers for the battery life-time, and we therefore want to send you a device with more capabilities to integrate all the sensor data; the EFM32WG. Have fun, stay safe Robot Happy


@CalmDownKarm - Smart Motorcycle Navigation System

I'd love to have one of these. Sending you the Leopard Gecko, as it will have a good mix of peripherals and flash size for your application.


@inakizi - Industrial Automation Process Data Display

Definately see the market for this and good description! The Tiny Gecko has LESENSE and low-power LCD drivers and should be perfect for your application.


@marthinicar - Interactive Music Toy

Looking forward to the video! The perfect device for this will depend on the code size, but the Happy Gecko should have enough resources (64 kB flash) for this and definitely be low enough power so you don't have to run around the room changing batteries all the time!


@marthinicar - Portable Baby Habits Log

As I'm not a father, I find this slightly odd, but I'll take your word for it Robot Happy The EFM32HG starter kit has a memoryLCD and should be perfect for your project. It even has USB in case you want to download it to a computer (or smartphone).


@hlipka - self-power battery checker

As most of the energy will be consumed in the load, you can use almost any microcontrollers for it. The EFM32 series however will get you quickly up running using Simplicity Studio, so we'll send you the EFM32ZG to get you started right away.


@lahcen005 - testing of communication devices

Cool application. Sending you the Giant Gecko to make sure you have enough resources.


@mmsk - All-in-one Measuring System

Love the application, but a bit thin on the realization part. Sending you a EFM32WG with DSP-capabilities and USB.


@neovisr - Industrial Data Logger with USB interface

A very good application for the EFM32 series. Make sure to check out this link. Sending you the EFM32HG with the new low-power crystal-less USB interface.


@MarTI - Driver assistance system

Not neccessarily a low-power application, but I'd love to see it realized. Sending you the Giant Gecko to make sure you have enough resources for everything you want to do.


@ejclark - Low Power Violin Tuner

Good project and description! I think my current guitar tuner has even less than 10 hours battery life, I'm really looking forward to see how long battery life you're able to achieve. An EFM32WG is on its way!


@krznowak - summer house battery source supervisor

Simple and understandable description. Winter is coming, so I hope you’ll get it ready before that… As you mention DSP instructions we will send you the EFM32WG with Cortex-M4 and integrated FPU.


@cchipmikro - Greenhouse Monitoring for Tomato Plantation

I love a good gardening project! Sending you the weather-station kit with the EFM32ZG and both RH+temp and light sensor.


@tym3k - reinvent the smartwatch

Thank you! Too many "smart" watches have just too many features to be used, looking forward to yours! Sending you the EFM32LG as this is one of the most popular devices for wearable market right now together with the weather station kit that has a gesture-sensing EXP-board.


@storyteller – alarm system

Good description and good understanding of the power of low-power in the EFM32. Sending you the Wonder Gecko for your processing needs!


@dk_5zm - Personal GPS and Environmental Data Display and Logger

As an avid hiker myself, I can definitely see the use-case! Sending you the EFM32LG as it should have all the capabilities you need!


@Sbharath33997 - Heart Attack Emergency Band for old people

A perfect application for Silicon Labs products. We have all you need from light sensors to low power intelligence! Sending you the Wonder Gecko, to make sure you can process the heart-rate in real-time.


While I can't promise you anything, we'll also try to get BLE-modules to those that mentioned that in the submission. All information in the e-mail.


Thank you again for sharing your great ideas with us and look forward to seeing your submission in the Low Power Design Contest (deadline: November 30th, 2015) for a chance to win $3,000 USD and other great prizes!


Best regards,


My views are my own and do not necessarily represent the views of Silicon Labs