![]() ![]() The three ATTiny84 chips are set into the breadboard so that there are 5 holes separating them and so that the Vcc and GND pins (1 and 14) are lined up with the rail holes. a bunch of jumper wires (I cut mine for this project so's they'd be all purty.If you want to do this yourself, you're going to need: The above breadboard image is an annotated photo of the prototype that I put together. While this sounds simple, there were some hurdles that I had to overcome along the way, these hurdles are really more about my knowledge and understanding than anything else.Īnyway, as with my other instructables, I'll try to explain what I've done and why and what I learned along the way. connect three ATTiny84 microprocessors to an Arduino UNO via I2C (or TWI in Arduino parlance). The goal with this mini project is pretty simple, really. This is where this instructable comes in. Since the architecture doesn't support multi-threading or multi-tasking, my solution is to outsource the control of each of the step motors to slaved devices. I've been working on building the pieces that I need to make myself a CNC PCB Mill for a little while now and the next part of the puzzle is trying to get the Arduino to control 3 step motors simultaneously.
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