Sometimes the simplest projects can be the most impressive. Most of the time our simple projects are not as neat and elegant as our more time consuming ones. Sometimes they don’t even leave the breadboard! When [Sasa Karanovic] first envisioned his key-chain idea, he knew it would be simple. But he made up for the lack of sophistication with style.
The heart-shaped key-chain has one goal – to flash a pair of red LEDs when a capacitive button is touched. He was able to accomplish this with a PIC12LF1822 and a handful of supporting components. We’re quite impressed with the soldering skills and layout of the PCB. The resistors, LEDs and single capacitor are 0603 surface mount devices, which push the limits of hand soldering. [Sasa] gives a great explanation of how capacitive touch buttons work and how they can be easily incorporated directly into a PCB.
What’s the smallest SMD you’ve soldered? Let us know in the comments, along with what you think about this nifty key-chain.