Home > Arduino Projects > Analog IR Temperature Gauge

Description:

The IRTEMP module from Freetronics is an infrared remote temperature sensor that can be incorporated into your Arduino / microcontroller projects. It can scan a temperature between -33 to +220 C, and can be operated using a 3.3 to 5V power supply. It can be powered directly from the Arduino 5V pin.  This module can also provide an ambient temperature reading if required.
The Servo used in this project is a SG-5010 standard servo which will be utilised to display the temperature reading from the IRTEMP module..

Video:



Parts Required:

Freetronics Eleven or any compatible Arduino.
Freetronics IRTEMP module
MG-995  or SG-5010 Standard servo
Mini Breadboard 4.5cm x 3.5cm
Protoshield and female header pins (not essential - but makes it more tidy)
9V Battery and Battery Clip
Wires to connect it all together


Software:

Arduino IDE
Processing IDE
IRTemp library (copy to your Arduino IDE's library folder)

Sketch:

 


Freetronics' Eleven / Arduino Sketch:

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/* -------------------------------------------------------
Analog IR Temperature Gauge: written by ScottC on 1st Dec 2012.
http://arduinobasics.blogspot.com/2012/12/arduino-basics-analog-ir-temperature.html


* Some of the code was adapted from a sketch by Andy Gelme (@geekscape)
* For more information on using the IRTEMP
see www.freetronics.com/irtemp

* IRTemp library uses an Arduino interrupt:
* If PIN_CLOCK = 2, then Arduino interrupt 0 is used
* If PIN_CLOCK = 3, then Arduino interrupt 1 is used
---------------------------------------------------------*/

#include "IRTemp.h"
#include <Servo.h>

Servo servo1;
static const byte PIN_DATA = 2;
static const byte PIN_CLOCK = 3; // Must be either pin 2 or pin 3
static const byte PIN_ACQUIRE = 4;

static const bool SCALE=false; // Celcius: false, Farenheit: true

/* Used to capture the temperature from the IRTEMP sensor */
float irTemperature;
int temp;

/* The minimum and maximum temperatures on the gauge. */
static const int minTemp = -45;
static const int maxTemp = 135;


/* The servo minimum and maximum angle rotation */
static const int minAngle = 0;
static const int maxAngle = 175;
int servoPos;

IRTemp irTemp(PIN_ACQUIRE, PIN_CLOCK, PIN_DATA);



/*----------------------SETUP----------------------*/

void setup(void) {

servo1.attach(9); // turn on servo
}


/*-----------------------LOOP-----------------------*/

void loop(void) {
irTemperature = irTemp.getIRTemperature(SCALE);
printTemperature("IR", irTemperature);

/* If you want the ambient temperature instead - then use the code below. */
//float ambientTemperature = irTemp.getAmbientTemperature(SCALE);
//printTemperature("Ambient", ambientTemperature);

}

/*-----------printTemperature function---------------*/

void printTemperature(char *type, float temperature) {

temp=(int) temperature;
servoPos = constrain(map(temp, minTemp,maxTemp,minAngle,maxAngle),minAngle,maxAngle);

if (isnan(temperature)) {
//is not a number, do nothing
}
else {

/* To test the minimum angle insert the code below */
//servoPos = minAngle;

/*To test the maximum angle, insert the code below */
//servoPos = maxAngle;

/* Rotate servo to the designated position */
servo1.write(servoPos);
}
}


For more awesome projects, or more info on this project, check out ScottC's Arduino Basics Blog