Monday, September 17, 2007


I2C + GM3 = problems

A while ago there was a discussion about using the I²C protocol for linking RepRap boards. My RepStrap machine uses I²C but when I started using it to control the GM3 gear motor of the extruder I ran into problems with electrical noise. Although I managed to solve them, my recommendation is that I²C is not a suitable protocol for off board communication, and the GM3 needs suppression. A triangle of three 1nF ceramic capacitors, one connected across the terminals and one from each terminal to the can works well and a couple of ferrite beads plus a fourth capacitor works even better.

More details in my blog:

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