This blog post is a follow-up on "Pre-processor for the DIY RC Light controller"
It did not take long until it became necessary to shrink down the pre-processor for my DIY light controller.
The HobbyKing HK-GT2R receiver is significantly smaller than the HKR3000 the LANE Boys are using, especially in height. No way an old-fashioned micro-controller in a DIP (Dual Inline Plastic) package can fit in there!
We need to solve this...
WARNING: This and other DIY projects are purely "at your own risk". If you are at all uncomfortable or inexperienced working with electronics, please reconsider doing the job yourself.
Luckily it is easy to get tiny micro-controllers nowadays. I opted for a Microchip PIC12F1840 in a SOIC8 package, which while being only 5 x 6 mm is still reasonably handable by mere mortals.
To program the chip I had to temporarily solder on tiny wires. A converter socket we ordered on eBay is still in transit.
Conveniently there is an empty area on the bottom of the HK-GT2R circuit board were we can mount our chip. The area contains test pads for 3.3V and ground that we tap on to power our little computer. The signals are wired with 0.19 mm thick enamel wire.
Like in the HKR3000 we used the (unused) signal pin on the battery connector to output our light controller signal. The HK-GT2R has this pin floating so no modification was needed.
Everything works fine and is nicely concealed!
All articles in this series:
DIY car light controller for 3-channel RC
Pre-processor for the DIY RC Light controller
DIY RC Light controller pre-processor miniaturization
DIY RC Light Controller update
DIY RC Light Controller with WS2812B