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    Arduino PT100 Temperature Sensor Converter

    PT100 Arduino Sketch (LCD)

    Alex @ AEQ-WEB

    Example code for the Projekt PT100 temperature measurement with Arduino. This sample code outputs the measured temperature values in the serial monitor and on a 16x2 I2C LC display.

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    //More information about this project can be find here: https://www.aeq-web.com/pt100-temperature-sensor-arduino-r-u-converter/
    #include <SoftwareSerial.h>
    #include <Wire.h>
    #include <LiquidCrystal_I2C.h>
    
    LiquidCrystal_I2C lcd(0x27, 16, 2);  // set the LCD address to 0x27 for a 16 chars and 2 line display
    
    const int pt100Pin = A0;  // Define PT100 input pin
    const float offset = -0.00; // Offset (depending on the line resistance)
    
    // Define known points (voltage & temperature)
    const float voltages[] = { 0.079, 0.56, 1.04, 1.99, 2.95 };    // Voltages in Volts
    const float temperatures[] = { 0, 25.0, 50.0, 100.0, 150.0 };  // Temperatures in Celsius
    
    const int numPoints = sizeof(voltages) / sizeof(voltages[0]);
    
    // Linear interpolation
    float interpolate(float x, float x0, float x1, float y0, float y1) {
      return y0 + (y1 - y0) * (x - x0) / (x1 - x0);
    }
    
    // Calculate temperature from voltage
    float calculateTemperature(float voltage) {
    
      // Set to 0°C if voltage is higher than max. known point
      if (voltage > voltages[numPoints - 1]) {
        return 999;
      }
    
      // Find limits for interpolation
      int i = 0;
      while (voltage > voltages[i + 1] && i < numPoints - 1) {
        i++;
      }
    
      // Interpolate between limits
      return interpolate(voltage, voltages[i], voltages[i + 1], temperatures[i], temperatures[i + 1]);
    }
    
    void setup() {
      Serial.begin(9600);
      lcd.init();
      // Print a message to the LCD.
      lcd.backlight();
      lcd.setCursor(2, 0);
      lcd.print("PT100 Tester");
      lcd.setCursor(0, 1);
      lcd.print("WWW.AEQ-WEB.COM");
      delay(5000);
      lcd.clear();
    }
    
    void loop() {
    
      int sensorValue = analogRead(pt100Pin);
      float voltage = sensorValue * (5.0 / 1023.0);
      float temperature = calculateTemperature(voltage)+offset;
    
      lcd.clear();
      Serial.print("Voltage: ");
      Serial.print(voltage, 3);
      Serial.print("V, Temperature: ");
      Serial.print(temperature, 1);
      Serial.println("°C");
    
    
      lcd.setCursor(0, 0);
      lcd.print("Temp: ");
      lcd.print(temperature, 1);
      lcd.print(" *C");
      lcd.setCursor(0, 1);
      lcd.print("Volt: ");
      lcd.print(voltage, 3);
      lcd.print(" V");
    
      delay(1000);
    }
    


    Info: This page was automatically translated and may contain errors
    122X122

    About the Author

    Alex, the founder of AEQ-WEB. He works for more of 10 years with different computers, microcontroller and semiconductors. In addition to hardware projects, he also develops websites, apps and software for computers.

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