The main control board was updated with the following hardware:
- HM-11 Bluetooth Module: Will allow for control and interfacing with display while it's spinning
- IR Led Driver Circuitry: The hall effect trigger signal is now also fed into an inverting buffer which drives an IR LED. This LED is oriented such that it shines on a receiver circuit (consisting of an array of phototransistors) on the stationary base. This setup creates an optocouple and allows me to transmit the hall effect trigger signal from the rotating control board to the stationary motor control circuitry. As the motor I'm using doesn't have an encoder, this signal will allow me to adaptively control the motor speed.
- Additional Bluetooth Status LEDS: An LED for the bluetooth connection status, and one connected to the bluetooth TX line make it easier to see what's going on with the bluetooth module, and also add a little bit of flair to the board.
The boards were fabricated using OSH park, and I had a stencil made through OSH Stencils. This was my first time using a stencil but aside from some minor solder bridges between the microcontroller pins, everything came out fine, and I found the experience to be much easier than placing the solder paste on each pad by hand.
I feel it's worth noting that I incorporate the receiving circuitry for the inductive coils onto the control board itself, instead of just mounting the coil's PCB. This involves desoldering the components from the coil's PCB and resoldering them onto my board. Which is definitely a less than ideal situation. I would love to instead develop my own inductive power transmission circuit as to not have to rely on these modules, but my previous attempts didn't pan out. If anyone has any comments or advice on this matter, I'd very much appreciate it.