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Correct, there have been some issues with the DAC setup but believe they finally fixed it in the 0.4.5 firmware release:


https://community.particle.io/t/photon-dac-pin-output-not-working-stuck-at-3-26v/16367/6


Seems there's also a DAC2 pin at A3, haven't played around with DAC yet so not sure how well this works.


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