Why is this cool?

It is a low cost microcontroller from microchip manufacturer Silicon Labs in the US that could find many uses for small projects as an alternative to the SAMD10 or PIC16. This is my first microcontroller that uses the 8051 from Intel.

The EFM8 family comes with multiple variations of the same chip, tailoring them to various tasks. The Universal Bee has USB capabilities and an integrated 3.3V LDO regulator, the Laser Bee is targeted towards analog and digital sensing functions, featuring a 14 bit ADC and a 4 channel 12 bit DAC, the Sleepy Bee is a low power specialist, and the Busy Bee serves as the generalist of the bunch.

First impressions

The EFM8 Laser Bee PCB is gorgeous. The pins are surface-mounted, so there aren't any prickly bits on the bottom, making the PCB very comfortable to hold and manipulate. However, one quibble is that you will need male-female wires to prototype anything on a breadboard because of how the pins are broken out.

EFM8 Laser Bee Development Board

It comes with a low power LCD and hardware to monitor the power that the Laser Bee is drawing. This is integrated closely with the IDE that Silicon Labs provides and you can even view a live trace of the current draw.

Simplicity Studio Energy Profiler Perspective


Development is done within the Eclipse-based Simplicity Studio, and Silicon Labs provides the Keil compiler for their chips completely free of charge. Simplicity Studio is cross-platform and installation is a breeze.

Note that for Linux users, you will have to install wine and libqt4-network separately for Simplicity Studio to work correctly.  

For the library/examples, there is no need to download and install the software development kit separately, everything is handled automatically within Simplicity Studio. I tried the examples in the launcher and was pleasantly surprised that they work without a hitch and actually come with really helpful comments and documentation. The examples are loaded on the launcher perspective when you select your board.

Launcher perspective

You would think that this is a given, but often enough I have come across old code or plain broken examples that looked like they were hacked together from an example for another chip. Sometimes they don't even exist at all and you are expected to work out the details yourself from a single 'general' example for the entire family of chips. Happily, this is not the case with Silicon Labs.

Helpful comments in the ADC example

There isn't much in the way of a standard library like HAL from ST Microelectronics or the ASF from Atmel, so most of the programming/setting up peripherals comes from register programming. It does require some familiarity with programming registers to get started quickly, but if you know how to toggle a pin using registers, then you should be fine. Newcomers from Arduino might be a little lost as to where to start, but both the useful documentation as well as the Open Declaration feature in Simplicity Studio should quickly help you get started.


The EFM8 development board is a joy to work with. With useful debugging tools, a smooth usage experience, and plenty of documentation, I would highly recommend this as the next new thing to try it out. If you have some experience with Arduino this might be a good next step into embedded development. The targeted features of this chip combined with their low cost make them highly attractive as mid-level workhorses, good in small systems or working in concert with more powerful chips in more complex systems.