I want to replace our kitchen clock with one that glows in the dark. I was inspired by this instructable from DeltaFlo and encouraged by further write ups such as this one from Barton Dring and this one from Vulcaman.
- I'm choosing Raspberry Pi for the controller. There are several other good options: Beaglebone might obviate the need for a separate MCU, ESP32 is cheap and in vogue right now. However, Raspberry Pi is well supported and has plenty of compute power.
- The Pi will have a physical and a web UI, accessible from the local LAN. The Pi will get its time from the internet.
- The Frame Driver draws the same thing over and over, until it's told to draw something different. It will be powered by a small microcontroller, and its output will be two ±5v differential signal.
- Complicated power supply. First, the Frame Driver's DAC will need a rock solid supply in order to accurately produce a signal for the mirror drivers. Second, that signal needs to be amplified from 3.3V to ±5v.
Questions To Answer
I will begin by addressing uncertainties:
- How good are the galvos and their drivers? What kind of accuracy can I expect in drawing?
- Do I need really to produce a ±5v signal, or is 0-10v good enough?
- What laser should I use? I want one that can operate continuously (for years, I hope!) show brightly and still be eye-safe.
- Where did I put that Raspberry Pi and its power supply?