Wireless Temperature Monitoring System

 

Circuit Diagram :-

Github :- Check Here

Code :-

//Prateek //www.prateeks.in #include <Adafruit_SSD1306.h> #include <Adafruit_MLX90614.h> #include <Wire.h> #include <millisDelay.h> #define SCREEN_WIDTH 128 #define SCREEN_HEIGHT 64 const int GREEN_LED = 5; const int RED_LED = 6; const int buzzer = 8; const int statePin = 10; bool measurement = false; const unsigned long interval_sensor = 50; millisDelay sensorDelay; const unsigned long interval_display = 500; millisDelay displayDelay; const unsigned long delay_hold_red = 5000; const unsigned long delay_hold_green = 1000; millisDelay holdDelay; Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1); Adafruit_MLX90614 mlx = Adafruit_MLX90614(); void setup() { Serial.begin(9600); if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { 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(); displayDelay.start(interval_display); } void loop() { static float temperature = -1; int state = digitalRead(statePin); if (state == LOW && measurement == false) { sensorDelay.start(interval_sensor); displayDelay.finish(); measurement = true; } if (measurement == true) { //if sensor reading temperature = GetTemp(); } else { temperature = -1; } ShowTemp(temperature ); holdReading(); } float GetTemp() { static int index = 0; static float temptot = 0; float hasil = 0; if (sensorDelay.justFinished()) { sensorDelay.repeat(); temptot += mlx.readObjectTempF(); index++; if (index == 19) { hasil = temptot / 20; temptot = 0; index = 0; sensorDelay.stop(); displayDelay.finish(); return hasil; } } return hasil; } void ShowTemp(float temperature) { if (displayDelay.justFinished()) { displayDelay.repeat(); if (temperature == -1) { 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) { display.clearDisplay(); display.setTextSize(1); display.setTextColor(WHITE); display.setCursor(20, 25); display.println("WAIT ...."); display.display(); } else { temperature += 8.5; display.clearDisplay(); if ( temperature > 100) { display.setTextSize(3); display.setCursor(5, 20); display.print(temperature, 1); display.print("F"); } else { display.setTextSize(3); display.setCursor(10, 20); display.print(temperature, 1); display.print(" F"); } display.display(); if (temperature > 100.4) { digitalWrite(RED_LED, HIGH); holdDelay.start(delay_hold_red); } else { digitalWrite(GREEN_LED, HIGH); holdDelay.start(delay_hold_green); } digitalWrite(buzzer, HIGH); displayDelay.stop(); } } } void holdReading() { if (holdDelay.justFinished()) { digitalWrite(RED_LED, LOW); digitalWrite(GREEN_LED, LOW); digitalWrite(buzzer, LOW); measurement = false; displayDelay.start(interval_display); } }


Result :-

Video :-