Triple Stepper for Atmega32U4 Development
grabcad
This is an application board for my Atmega32U4 PCIE based development board. It's got three stepper driver interfaces, a relay, and a 2 x 16 LCD parallel interface. The inputs comprise two buttons and an encoder. Everything needed to push the capability of the 32U4. It might not run GRBL, but its a good place to start for simple robotic applications. It uses most of the io on the 32U4. It needs 6 of the 7 pins that are not available on the arduino pro-micro. So this is a good fit.
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