Hello,
I would like to make an infrared thermometer like in this tutorial: DIY Non Contact Thermometer - Open Green Energy
however I do not have an OLED screen at my disposal I would like if possible to use an LCD screen (16x2) with i2C.
But I can't find the code; please help me.
Thanks
#include <Adafruit_SSD1306.h> //library oled
#include <Adafruit_MLX90614.h> //library sensor temperature
#include <Wire.h> //library I2C
#include <millisDelay.h> //library looping
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
const int GREEN_LED = 3; // pin D3 for green LED
const int RED_LED = 5; // pin D5 for red LED
const int buzzer = 7; // pin D7 for buzzer
const int statePin = 9; // pin D9 for IR proximity sensor
bool measurement = false; //check temperature measurement running
const unsigned long interval_sensor = 50; // interval refresh sensor in mS
millisDelay sensorDelay; // the delay object
const unsigned long interval_display = 500; // interval refresh OLED display in mS
millisDelay displayDelay; // the delay object
const unsigned long delay_hold_red = 5000; // delay hold red LED in mS
const unsigned long delay_hold_green = 1000; // delay hold green LED in mS
millisDelay holdDelay; // the delay object
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
// Declaration for an MLX90614 sensor connected to I2C (SDA, SCL pins)
Adafruit_MLX90614 mlx = Adafruit_MLX90614();
void setup() {
Serial.begin(9600);
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
Serial.println(F("OLED Display allocation failed"));
for(;;);
}
pinMode(statePin, INPUT);
pinMode(GREEN_LED, OUTPUT);
pinMode(RED_LED, OUTPUT);
pinMode(buzzer, OUTPUT);
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(WHITE);
display.setCursor(20, 20);
display.println("Initializing");
display.display();
delay(250);
display.clearDisplay();
mlx.begin(); //sensor initialization
displayDelay.start(interval_display); //refresh display
}
void loop()
{
static float temperature = -1; //initial condition
int state = digitalRead(statePin); //IR sensor condition
// check if the IR sensor detect people in front of sensor. If it is, the state is LOW:
if (state == LOW && measurement == false)
{
sensorDelay.start(interval_sensor); //read sensor
displayDelay.finish(); //finish interval refresh for display
measurement = true; //change state of measurement
}
if (measurement == true)
{
//if sensor reading
temperature = GetTemp(); //get temperature in celcius
}else
{
temperature = -1; //marker if sensor not reading temperature
}
ShowTemp(temperature ); //display temperature to OLED
holdReading(); //call holdReading function
}
float GetTemp()
{
static int index = 0;
static float temptot = 0;
float hasil = 0;
if (sensorDelay.justFinished())
{
// read sensor and repeat
sensorDelay.repeat(); // repeat
// temptot += mlx.readObjectTempC(); //add the reading to the total
temptot += mlx.readObjectTempF();
index++; //increment index
if(index==19)
{
//if already 20 measurement
hasil = temptot/20; //calculate average
temptot = 0; //zero total
index = 0; //zero index
sensorDelay.stop(); //stop reading
displayDelay.finish(); //complete the refresh interval so that it shows immediately
return hasil; //give results
}
}
return hasil; //As long as there are no results, give a value of result = 0
}
void ShowTemp(float temperature)
{
if (displayDelay.justFinished())
{
displayDelay.repeat(); // repeat
//show temperature
if(temperature == -1)
{
//if there are no object in front of sensor
display.clearDisplay();
display.setTextSize(2);
display.setCursor(35, 5);
display.print("-----");
display.setCursor(105, 20);
display.print("");
display.setTextSize(2);
display.setCursor(35, 40);
display.print("-----");
display.setCursor(105, 46);
display.print("");
display.display();
}else if(temperature == 0)
{
//if still reading temperature
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(WHITE);
display.setCursor(20, 25);
display.println("WAIT ....");
display.display();
}else
{
//if there is a new result
temperature += 8.5; // sensor temperature calibration
display.clearDisplay();
if( temperature > 100)
{
display.setTextSize(3);
display.setCursor(5, 20);
display.print(temperature,1);
display.print("F");
// display.print("C");
}
else
{
display.setTextSize(3);
display.setCursor(10, 20);
display.print(temperature,1);
display.print(" F");
// display.print("C ");
}
display.display();
if (temperature > 100.4)
{
//if the temperature is too high
digitalWrite(RED_LED, HIGH);
holdDelay.start(delay_hold_red); //run delay for red LED or temp > 38
}else
{
//if the temperature is normal
digitalWrite(GREEN_LED, HIGH);
holdDelay.start(delay_hold_green); //run delay for green LED or temp < 38
}
digitalWrite(buzzer, HIGH);
displayDelay.stop(); //stop refresh display
}
}
}
void holdReading()
{
if (holdDelay.justFinished()) {
// if holddelay finish
digitalWrite(RED_LED, LOW);
digitalWrite(GREEN_LED, LOW);
digitalWrite(buzzer, LOW);
measurement = false; //allow new measurements
displayDelay.start(interval_display); //restart the OLED display
}
}
