Author Topic: digispark analog input  (Read 1112 times)

dlc_mnl

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digispark analog input
« on: December 20, 2019, 04:47:03 pm »
I have the problem that by directly connecting a potentiometer to the digispark the light flashes without any variation. What pins of the digispark can a potentiometer be used?

granzeier

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Re: digispark analog input
« Reply #1 on: December 21, 2019, 02:42:21 am »
Take a look at the schematic (https://s3.amazonaws.com/digistump-resources/files/97a1bb28_DigisparkSchematic.pdf;) the analog input pins (ADC) are connected to PB2, PB3 and PB4. Unfortunately, due to the limited number of pins, ADC2 (PB4) and ADC3 (PB3) are used for the USB communications. Any external circuitry connected to those pins MAY interfere with the USB, and may need to be removed to reprogram the Digispark.

To connect a pot to the Digispark, connect the two ends of the pot to +V and ground, and the wiper to ADC1 (PB2.)