ESP8266: Handling analog signals without an analog input, ju
Posted: Mon Apr 20, 2015 12:05 pmExperimenting with the ESP8266 at one point I came across the need of dealing with analog signals. There are a lot of versions of the module and most of them have GPIO accessibility but not ADC access. Some of the lates versions of the module have ADC though, but I have a few modules in stock that do not have it. And I need ADC handling.
Well, it is totally possible and here is how to do it.
There are 4 basic things that need to be done:
I am using NodeMCU Lua API. For more details and a description of the project visit http://www.horaciobouzas.com
Well, it is totally possible and here is how to do it.
There are 4 basic things that need to be done:
- convert the analog signal into pulse width modulation (PWM)
read the PWM on any GPIO
read the PWM duty cycle on the ESP8266
calibrate the PWM to analog level response
I am using NodeMCU Lua API. For more details and a description of the project visit http://www.horaciobouzas.com