I'm using a gear motor to drive my pinch wheel, and I decided I needed feedback to control the speed. Unfortunately, I didn't order a rotation sensor PCB when I bought the electronics from MakerBot. The various charges mean that buying it now would cost me about £30, which is daft, and no-one else seems to sell it. I looked into getting one made, but that's almost as much, especially as it's double-sided. In fact, the only people I could find offering to make PCBs in small quantities for a reasonable price have pictures on their website that look just like home-made boards I have seen. Maybe I should find out how it's done?
I decided (since I've never made a PCB before) to simplify the board as much as possible. My aims were:
- Keep the same position of the IC relative to the mounting holes, in case I ever want to replace the board with the MakerBot version;
- Keep the same connector and pin assignment so that it connects to the Extruder Controller;
- Switch to a single-sided PCB if possible;
- Switch to through-hole components, except for the IC (which is surface mount only).
- Lose the two extra mounting holes near the centre of the board;
- Lose the analog output on pin 2 of the connector.