Allan Stirling wrote:
In addition to the (simple) circuit described, you need to add a 800ohm resistor between pin 25 and pin 12 to bring the voltages on the '150 down to 3.3v again. The reason for this is the '150 uses 'low voltage' I2c - 3.3v. The parallel port "pulls up" to 5v. Therefore, none of the chips onboard the card get "low" pulses. Be
Doh.
... aware that with this resistor present, the board WILL NOT WORK properly when not attached to the parallel port. So make this resistor switchable or removable in some way.
Cheers,
Allan.
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