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Have you read Anders' forum post on EFM32 Christmas tree kit? The kit was designed by Anders, Marius, and Dewald last year to give a meaningful gift to their colleagues in Norway. This year, the team challenged to make 1200 EFM32 Christmas kits for all employees at Silicon Labs and deliver them before Christmas. The kits are made for Silicon Labs' employees only but we would like to give away some of them to our forum members as well! 

How to win your EFM32 Christmas tree kit? It's easy. Share a project you want to hack on in 2014 in the comments below. We will pick 15 winners with the most interesting ideas and send them an EFM32 Christmas tree kit. NB: You can participate in the contest only once. Join the contest now, and get the chance to win a fantastic Christmas gift to yourself or your loved one! 

Watch how 32-bit Christmas Trees based on EFM32 Cortex-M3 are born:

The contest ends December 11st, 2013


Good luck!   :-)


  • Projects
  • This really looks awesome! So yes, I'd love to have a chance to win one.

    I'm really unlocky when it comes to traveling. During one of my previous missions, I was sent to the US twice. The first time, they lost my baggage for 2 weeks, the second time they sent it through a transporter, and it was locked in customs for a week. Then I went on a mad rush through the US; 14 days, 14 flights. They lost my luggage 5 times. I can remember watching from the airplane window as they were loading luggage onto the aircraft. I watched to see if my luggage was there. It was. I really wished I hadn't of watched.

    That is when an idea came to mind. I wanted to put a bit of electronics in my baggage, to see what happens. I wanted a few sensors; accelerometer, humidity (which is also on the advent calendar!), temperature and a few others, just to see what my luggage goes through. This would all be powered by something very low powered, because maybe I'll need to keep it on for two weeks, if ever my luggage is lost again. Also, I want it to run from a standard battery, nothing LiPo (after all, baggage is screened, if they see some strange electronics, it might become difficult to get through). I think a little I2C network might be fun, but I'd need to look a little closer at the accelerometer, so see if there is a way of sending an IRQ when a certain level is reached, either that or wake up the system every few seconds, but I'd miss 90% of any impact data. Still studying!

  • I like PC keyboards with mechanical keyswitches with good tactile feedback, instead of the cheap mushy dome or membrane switches used in most PC keyboards now. I liked the IBM Model M with its buckling spring technology, or the Nortgate OmniKey with Alps keyswitches. There are still some mechanical jeyboards beind made, mostly using Cherry switches, but they are uncommon and expensive.

    I also want n-key rollover, which only exotic gaming keyboards tend to have. This requires a diode in series with each key, which isn't actually very costly, but since most people don't care about it, the vendors aren't willing to add even that small additional expense.

    I also like wireless keyboards. They're inexpensive but don't have good tactile feel or n-key rollover.

    I plan to take an existing mechanical keyboard, rip out the old, power-hungry NMOS 8051 encoder, snd replace it with an EFM32 microcontroller and a Bluetooth LE module, to get a wireless keyboard with good tactile feel, n-key rollover, and long battery life.

    I'm primarily doing this to satisfy my own need, but I've already had some friends ask me to build them units as well, so I'm considering manufacturing these for sale, though it's obviously a niche product.

    This would be a great application for an EFR, but I'll prototype with a Gecko, or a Zero Gecko if I can make the firmware small enough to fit.
  • It looks nice,

    I have forwarded the video to all our factory with subject : It would be nice if our pcbas could be made like these Robot Happy

    We have a new design request for battery powered cleaner. Even we have a good price with ST microcontroller (Some million/year) is still a challenge to try with your EFM32 or is a good inspiration for my kids Robot Happy


  • We currently have an EFM32 Gecko based 2.4 GHz wireless sensor node running our own special gossiping protocol. Next year we would very much like to port it to an EFR to see if we can cut on the power budget. The currently used transceiver is drawing a significant amount of current when listening. And with less current we can also downscale the energy harvesting for it.


    Why would I want the Christmas tree? To convey my enthusiasm for electronics and embedded software to my 10 year old daughter.


  • Well, in 2014 we're installing a network of parking sensors in a large-ish city in Argentina. The data converges to the internet for further analysis, statistics, business intelligence and traffic optimization.

    Each node is installed in the street where the car parks, it has a solar panel and with its supercap it can last for 4+ days without any light. Even shadowed and with very low light intensity it charges 5x the current it consumes. Under direct sunlight it charges around 2000x the current it consumes. It uses a magnetic sensor and a neat power supply posted here. Since it uses a supercap instead of a battery, I expect to guarantee a 10 years of service life, and hopefully in practice it could be more like 20 years.

    Today we were struggling with the new radio, but it should be finished soon. I'm in charge of the over-the-air bootloader.

    Oh, and it obviously uses an EFM32. We ordered a couple of samples of the new Zero Gecko to migrate the firmware to the new device.


    This platform will be neat for speed sensors as a replacement of radars, general traffic analysis, and general outdoor sensing, its a very strong enclosure.

  • My first project for 2014 is to build a new kitchen working light. You know, the one hidden under the wall cupboard, where one never knows where the switches are hiding... So this project is about replacing the neon lights with a string of 1W white LEDs, activated by a proximity sensor. This allows activating by simple moving the hand somewhere near the lights to switch them on and off.

  • the project  i would like to hack in 2014 is the Lego's sorting device  is a machine that sort Lego's on color and size. The controle of this device is done by a computer. I want rebuild this Lego's sorting device to be wireless control via my smartphone.


  • In the spirit of flashing LEDS, this coming year’s hack-able project may bring back memories to those “older” folks in the audience.  Very popular with the in the mid 70’s were analog light boxes called color organ.  These boxes converted sound, generally music, to colored light patterns.  The signal was run through parallel band pass filters to specific color lamps.  The color pattern was determined by the frequency and amplitude of the input.  The object of the hack would be to replace the analog filter with a processor’s DSP function and the lamps with high efficiency LEDs.  Total groovy and completely psychedelic!

    Attached Files

  • This really looks awesome! 

    My first project for 2014 is a microcontroller watering system to automate the watering of my plants. With this system one can monitor temperature and soil humidity and alert me when something is wrong.

    This gives the possibility to water the plants remotely over the Internet from any PC or mobile phone.

  • Great job on the tree!!

    My first project for 2014 is to create a USB power monitor using the memory display and the EFM32ZG to allow me to characterize and monitor the power consumption of various USB devices I have. It will measure voltage the voltage of the power source as well as the current drawn by the load and log it in csv format to a SD card for easy importing into Excel. This will allow me to create cool graphs of charging and power profiles of various device.

    Merry Christmas Robot Happy