Search found 2 matches

by Marc Boon
Sun Aug 08, 2021 12:50 pm
Forum: ESP32 Arduino
Topic: ESP32-S2 ADC2
Replies: 3
Views: 5936

Re: ESP32-S2 ADC2

I found that using analogRead(1) on Arduino gives unexpected results out of the box. Connecting GPIO1 (ADC1_CH0) to VCC/2 (1.65V) results in a value of 8191 (instead of around 2047 as expected for a 12 bit result at half-scale). After reading the documentation, I understand that after reset ADC1 is ...
by Marc Boon
Sat Aug 07, 2021 7:21 pm
Forum: Hardware
Topic: Digital To Analogue Converter Characteristics
Replies: 7
Views: 15368

Re: Digital To Analogue Converter Characteristics

I came across the same problem with a ESP32-S2-WROVER, mounted on the ESP32-S2-Saola-1 development module. I guess the DAC is the same as in the original ESP32. Using a 10K load to GND gives a linear response, no curvature at the high end with the 220 ohm load as pictured above. So, if you need to s...