Sunday, April 20, 2008


USB comms established on Big Board

I had accidentally taken the three 104 nF capacitors that were supposed to be wired in parallel between pin 18 and ground were connected wrong. The 3.3v supply (pin 18) had been accidentally connected directly to ground bypassing the capacitors (see red arrow).

Once I fixed that my PC immediately recognised the board when I plugged it into a USB port. Using the Tommelise 2.0 control panel I was also able to see that tests of USB and buffer code is working like it does on the prototype board (see red arrow).

Now I must start wiring up a hex inverter chip and one of the stepper driver chips (754410).

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