I am testing ADS115 boards and have a weird issue.
When I connect one to an esp32 using DuPont cables. The A0 measure voltage is always 0.5-0.6V, even with nothing connected to the A0 pin. I have tested with 3 different ADS boards and 2 different esp32’s with the same result.
I have 1 ads board that works as expected, A0 shows 0.00xxV when nothing is connected and it works reading a CT clamp sensor.
Are the ADS boards bad? Or am I missing something?
wiring
Esp32 ↔ ADS1115
- SDA ↔ SDA
- SCL ↔ SCL
- 3.3V ↔ VDD
- GND ↔ GND
- None ↔ A0 disconnected: multiplexer set to A0_GND