Closed
Description
v3.8 was the first version to use the tighter tolerance value of 4.75%. Prior to that version, the tolerance windows were very large (10%).
Some ESP32 have an incorrectly trimmed ADC fuse. This leads to the ADC reading of the device ID resistors being slightly wrong. This leads to some devices being improperly ID'd. When the device can't ID itself, it defaults to the Surveyor type.
It seems very rare. We've only seen a few devices (5 currently) that exhibit this behavior. The solution is to increase the ID windows by increasing the tolerance as well as calculating the upper and lower thresholds more accurately.