Arduino (IoT): RTD PT 100 Sensores Industriales Parte I

Setup:

PT100 (blanco) ——–4/20mA (B)

Resistor A0-Tierra es 237Ω

Codigo:

int sensorValue = 0;
int temperature = 0;
int ReceivedByte = 0;
float f1 = 0;
float t1 = 0;

void setup() {
  Serial.begin(9600);
  Serial.println("hi...");
}

void loop() {
  delay(1000);
  sensorValue = analogRead(A2);
  //Serial.println(sensorValue);
  /**
   current voltage(250 Ohm) ADC Temperature
 -----------------------------------------------------
 4 mA 1 V 205 -50 C
 20 mA 5 V 1023 +150 C
   **/
  // map the signals (multiplied by 10
  // to get decimal values, because map() doesn't work with floats)
  temperature=map(sensorValue,205,1023,-500,1500);
  f1 = temperature; // Float conversion
  t1 = f1/10.0; // dividing by 10
  // with one decimal value
  // Printing temperature value over serial port
  Serial.print(t1);
  Serial.print("\n");

Resultados :