Another Unicorn HAT project that I’ve been fiddling around with for a while. I was looking for a way to introduce kids to the idea of Fast Fourier Transforms (FFTs) and signal processing so with my love of blinking lights I thought I’d create an audio visualiser just like the one you tend to find in media-players.
This post is a sort of eulogy. About 5 years ago I decided to teach myself a little more about electronics and thought building an LED matrix from scratch would be a good idea. Not just any old LED matrix, a 16×8 LED matrix. That’s 128 individual LEDs along with a whole bunch of resistors, transistors and a couple of shift registers for good measure.
Short one today. For another robotics project I’m working on I needed an easy way to mount multiple ultrasonic sensors to the chassis. This mount was designed to be screwed directly to the chassis, whilst allowing the actual sensor to clip in without a permanent fixing.
These next two prints were a little less ambitious than the Unicorn HAT diffuser. Needing a little platform to experiment with robotics I bought a STS-Pi kit with the intention of mounting a Raspberry Pi Zero (with Explorer pHAT) on it to make a teeny rover. I didn’t realise until I received it, that it’s designed to bolt a full size Raspberry Pi directly to the chassis and while you can mount a Pi Zero, you’d need extra bolts to mount one in it’s case. Not wanting to ditch a case (or buy any extra bolts), I set about designing something to fix the problem. (more…)
Whilst the Unicorn HAT is a lovely, colourful, 8×8 matrix, the individual NeoPixels are naturally round and quite bright. Needing to get to grips with our Maker Space’s 3D printer I decided a good first project would be a diffuser that would turn those circular LEDs into square ‘pixels’.