The touchfoil gets its power from Pin 4 of the 9 way 'D' Serial connector, but the standard wiring for bluetooth devices traditionally have this pin unused. However, Pin 7 is available to provide power instead.
Make a 9 way 'D' male to female adaptor that connects:
- Pin 2 to Pin 2 (Communications)
- Pin 5 to Pin 5 (OV)
- Pin 4 to Pin 7 (Power 7 - 12 Volts @ 5mA)
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