- Thu Jun 06, 2019 5:35 pm
#82700
What I consider the biggest problem with the ESP8266 A/D is the non-symmetrical aspect of the noise. Random noise can be filtered if you if you integrate long enough. But when it is largely distributed in one direction it is harder to get the correct result without more sophisticated filtering.
The above was taken from a lengthy discussion on an Arduino/ESP8266 issue.
https://github.com/esp8266/Arduino/issues/2070
One solution to reduce the noise was to disable the radio in order to take a measurement. And that may be an option in some circumstances.
I have used the A/D to make a six button analog keypad interface. More recently as a 100 step stepper motor controlled throttle position sensor for remote control of a gas motor water pump. Accuracy wasn't the primary requirement. Stability was more important. I finally found a useful filter for that application.
ResponsiveAnalogRead https://github.com/dxinteractive/ResponsiveAnalogRead
I have another application that I am using the ESP32. Temperature and AC current monitoring, for a customer where I work. I had thought they learned from the ESP8266 and had a good A/D in the ESP32. But it also has serious issues. 12 bit A/D that I consider to be equivalent to an 8 bit A/D on a microcontroller.
The above was taken from a lengthy discussion on an Arduino/ESP8266 issue.
https://github.com/esp8266/Arduino/issues/2070
One solution to reduce the noise was to disable the radio in order to take a measurement. And that may be an option in some circumstances.
I have used the A/D to make a six button analog keypad interface. More recently as a 100 step stepper motor controlled throttle position sensor for remote control of a gas motor water pump. Accuracy wasn't the primary requirement. Stability was more important. I finally found a useful filter for that application.
ResponsiveAnalogRead https://github.com/dxinteractive/ResponsiveAnalogRead
I have another application that I am using the ESP32. Temperature and AC current monitoring, for a customer where I work. I had thought they learned from the ESP8266 and had a good A/D in the ESP32. But it also has serious issues. 12 bit A/D that I consider to be equivalent to an 8 bit A/D on a microcontroller.
