My Arduino pins are full! I have an RFID reader using SPI, a PIR sensor, an LCD and a 74HC595 controlling LEDs! The only pins I have left are A1, A2, D2 and D3 which are being used for this. So the reason I am going from digital to analog back to digital again is I have to. I know the internal ADC will work - using a potentiometer, but I can't get this external DAC to work. I've also tried using an R-2R Ladder like this attached to the switch rather than Arduino, which works well I get Va...
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