This example demonstrates the use of an M5S digital input module (M5S-BID0524B1) to detect a voltage of 24 V DC. It reads a digital input using the digitalRead function and prints the result to the Serial Monitor.

Since the code uses pinMode(INPUT_PULLUP) instead of pinMode(INPUT), no external pull-up resistor is required. An internal resistor of 20 kΩ in Arduino pulls the input pin to 5 V in passive state. This configuration causes the input to read HIGH when the input module is OFF, and LOW when it is ON.

The circuit

• External: M5S digital input module detecting a voltage of 24 V DC.
• Internal: M5S digital input module connected to Arduino digital pin 2.

Characteristics of different input modules

• M5S-BID0524B1

  M5S input Uext    -> M5S ON  -> Arduino pin voltage 0 V -> Arduino value 0 (LOW)
  M5S input passive -> M5S OFF -> Arduino pin voltage 5 V -> Arduino value 1 (HIGH)

• M5S-BID0524A1
  

  M5S input GND     -> M5S ON  -> Arduino pin voltage 0 V -> Arduino value 0 (LOW)
  M5S input passive -> M5S OFF -> Arduino pin voltage 5 V -> Arduino value 1 (HIGH)

Code

void setup() {  
  Serial.begin(9600);       // start serial connection
  pinMode(2, INPUT_PULLUP); // configure pin 2 as an input and enable the internal pull-up resistor  
}

void loop() {
  int sensorVal = digitalRead(2); // read the value of pin 2 into a variable
  Serial.println(sensorVal);      // print the value to the Serial Monitor
}

This example code is based on the Arduino default example:
http://www.arduino.cc/en/Tutorial/InputPullupSerial

This example demonstrates the use of an M5S digital output module (M5S-BOT05750D1b) to switch a load with a maximum voltage of 24 V DC and a maximum current of 750 mA. It writes a HIGH / LOW value to a digital pin using the digitalWrite function and prints the value to the Serial Monitor.

The circuit

• External: M5S digital output module switching a load with a maximum voltage of 24 V DC and a maximum current of 750 mA.
• Internal: M5S digital output module connected to Arduino digital pin 3.

Characteristics of different output modules

• M5S-BOT05750D1b

  Arduino value 0 (LOW)  -> Arduino pin voltage 0 V -> M5S ON  -> M5S output Uext
  Arduino value 1 (HIGH) -> Arduino pin voltage 5 V -> M5S OFF -> M5S output passive

• M5S-BOT05750C1b

  Arduino value 0 (LOW)  -> Arduino pin voltage 0 V -> M5S ON  -> M5S output GND
  Arduino value 1 (HIGH) -> Arduino pin voltage 5 V -> M5S OFF -> M5S output passive

Code

void setup() {  
  Serial.begin(9600); // start serial connection  
  pinMode(3, OUTPUT); // configure pin 3 as an output
}

void loop() {
  writeAndPrint(HIGH); 
  delay(1000);         // wait 1 second
  writeAndPrint(LOW);  
  delay(3000);         // wait 3 seonds
}

void writeAndPrint(int value) {
  digitalWrite(3, value); // write the value to pin 3  
  Serial.println(value);  // print the value to the Serial Monitor
}

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

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

This example demonstrates the use of M5S analogue output modules to output 0-20 mA / 0-10 V signals. It uses the analogWrite function to set the pulse width modulation (PWM) of a digital output pin. The value has to be between 0 and 255. Also prints the value to the Serial Monitor.

The circuit

• External: M5S analogue output module outputs 0-10 mA / 0-10 V signal.
• Internal: M5S analogue output module connected to Arduino digital pin 5.

Characteristics of different output modules

• M5S-AOA05020D3Ab

  Arduino value 0   -> Arduino pin voltage always 0 V -> M5S ON  -> M5S output 20 mA
  Arduino value 255 -> Arduino pin voltage always 5 V -> M5S OFF -> M5S output 0 mA

• M5S-AOV05010D3Ab

  Arduino value 0   -> Arduino pin voltage always 0 V -> M5S ON  -> M5S output 10 V
  Arduino value 255 -> Arduino pin voltage always 5 V -> M5S OFF -> M5S output 0 V

Code

const int analogOutPin = 5; // analogue output pin

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

void loop() {
  writeAndPrint(0);
  delay(1000); // wait 1 second
  writeAndPrint(127);
  delay(1000); // wait 1 second
  writeAndPrint(255);
  delay(3000); // wait 3 seconds
}

void writeAndPrint(int value) {
  analogWrite(analogOutPin, value); // change the value of analogOutPin
  Serial.println(value);            // print the value to the Serial Monitor
}

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