This example demonstrates the use of M5S analogue input modules to read 0-20 mA / 0-10 V signals. It uses the analogRead function to read an analogue input pin, which results in a value between 0 and 1023. Also prints the value to the Serial Monitor.

The circuit

• External: M5S analogue input module connected to a 0-20 mA / 0-10 V signal.
• Internal: M5S analogue input module connected to Arduino analogue pin A4.

Characteristics of different output modules

• M5S-AIA05020B3

  M5S input 0 mA  -> Arduino pin voltage 0 V -> Arduino value 0
  M5S input 20 mA -> Arduino pin voltage 5 V -> Arduino value 1023

• M5S-AIV05010B3

  M5S input 0 V   -> Arduino pin voltage 0 V -> Arduino value 0
  M5S input 10 V  -> Arduino pin voltage 5 V -> Arduino value 1023

Code

const int analogInPin = A4; // analogue input pin

void setup() {
  Serial.begin(9600); // start serial connection  
}

void loop() {
  int sensorValue = analogRead(analogInPin); // read the value of analogInPin into a variable
  Serial.println(sensorValue);               // print the value to the Serial Monitor

  // wait 2 milliseconds before the next loop for the analogue-to-digital
  // converter to settle after the last reading
  delay(2);
}

This example code is based on the Arduino standard sample:
http://www.arduino.cc/en/Tutorial/AnalogInOutSerial