Poly, Arduino, Fab academy, Send Information
Pauduino:
Having managed to create my own version of an Arduino this year, I used that for the final board. For each of the drivers/axis of my robot I only need 2 pins to send the information for the number of steps and the direction of the stepper motors, so with an Arduino, I can in theory drive up to 10 motors, which would be more than enough for every axis I require. Of course I need other pins for different functions.
Microstepping:
My board can achieve mircrostepping with the Pololu drivers (the top step and direction pins are for the larger tb6600 stepper driver required for the NEMA 23 – this can be interchanged with a Satstep board) using the 3 switches on the board indicating MS1, MS2 and MS3.
I2C:
I am using I2C communication for the stop switches. In this way I could have up to 128 stop switches using just two pins (a little over the top), but the pin saving is tremendous for the 6 I will eventually need. For this I connected the SDA and SCL pins of the AT-Mega 328-P to the same on an AT Tiny85. The 85s are in turn connected to a button which changes the boolean being sent to the main board when pressed.
This project is made by Paul Nichols
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