I am using a pulse sensor (https://pulsesensor.com) connected to an Adafruit Feather Huzzah esp8266 board. It draws power from a 3V pin ("the output from the 3.3V regulator that can supply 500mA peak"), and sends the sensor values to the ADC pin. However, this pin has "a 1.0V maximum voltage." I am trying to create a voltage divider but don't know how to go about it. Any help/a diagram showing how to wire this voltage divider on a breadboard, would be greatly appreciated.
Forget the voltage divider.Use analogReference(INTERNAL) and you will get a range of 0..1.1V at the analog inputs. By the way that will be more independen from Vcc as well.
None of that on an ESP8266.It only has one analogue input with a range of ~0-1volt.Leo..
Then, where is the problem?
The sensor delivers about 3.3V.