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Can I measure lithium ion cell voltage with Arduino ADC which is used to power the same Arduino through a boost module (XL6009)? The output voltage of boost module is 9 volts.

  • Sidenote: why are you boosting the voltage to 9V (and presumably using the voltage regulator on the nano to bring it back to 5V)? – Gerben Sep 24 '18 at 18:26
  • @Gerben Because the lithium ion cell voltage can be in the range of 3-4.2 volts depending upon the charge level. So to operate the analog circuit (using LM358) and Arduino nano at a stable voltage I have to boost the input voltage. Plus the XL6009 module will keep the output voltage stable at 9V regardless of the input voltage. – Muhammad Saad Sep 25 '18 at 5:41
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I'm the author of a library called BatterySense and you can use it to achieve your goal. In the repository Readme you can also find wiring diagrams and usage examples, but to give you a rough idea...

  1. Verify the negative side of your battery has continuity to the GND pin of your Arduino: you need to identify if the boost module is messing the common ground, but if you have continuity then you are fine
  2. Add a connection from the battery positive terminal going into one of the Arduino analog pins
  3. Use the BatterySense library to get the battery voltage and percentage level
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You could use an analog pin to measure the voltage as long as it is not over 5VDC (assuming your Arduino is running at 5V).

There is a tutorial here: https://www.arduino.cc/en/Tutorial/ReadAnalogVoltage

void setup() {
  Serial.begin(9600);
}

void loop() {

  // read the input on analog pin 0:
  int sensorValue = analogRead(A0);

  // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):
  float voltage = sensorValue * (5.0 / 1023.0);

  Serial.println(voltage);
}
  • You can use a voltage divider to increase the range of measurement. For example divider made of two identical resistors will drop voltage by exactly 50% of the input voltage, so you can measure voltages from 0V to 10V and not exceed the 5V limit on Arduino input (you loose precision though) – Filip Franik Feb 26 '18 at 14:51

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