Grove Voltage Divider measurements are not accurate or stable

[Leto]

@jasta I’m having a similar issue with my Arduino Nano + Grove Voltage Dividers. Maybe you can join the discussion.

Grove Voltage Divider not accurate on stable 12V

Hi everyone, When using a V1.1 Grove Voltage Divider to check a stable 12V (provided by a 2A wall adapter) the readings are off by about 0.6V. (12.7 vs actual 12.08-12.11). I’m running this from an Arduino Nano with the groove board, powered by my PC’s USB port. I checked with a second identical V1.1 Divider (on a different Pin) and got the same measurements. I measured the 12V using 2 voltmeters (12.08-12.11) I tried both the 3 and 10 setting. I used the provided x * sensorValue * 4980 / 10…