Purpose of this project:
In this project a cooling system will be built with Arduino. It mainly uses a DTH11 temperature sensor, fan and LCD display.
When the Arduino board detects a temperature > 28°C the fan starts to rotate until the temperature becomes < 28°C.
Necessary components
- Arduino
- LCD display
- DTH11 temperature sensor
- a small 5V fan
- a relay
- connecting wires
Mounting
To complete the assembly, you can connect:
For relay
- Pin S to PIN1 of Arduino
- Pin (+) to 3.3V of Arduino
- Pin (-) to GND of Arduino
- Pin ON to 5V PIN of Arduino
For the fan:
- Pin (+) to COM Pin of relay
- Pin (-) to GND of Arduino
For DHT11 sensor:
- Pin DATA to Pin2 of Arduino.
- Pin VCC to 3.3V of Arduino
- Pin GND to GND of Arduino
For the LCD display:
-
the SDA pin at the Arduino analog pin A4.
-
the SCL pin at the Arduino analog pin A5.
-
the VCC pin at the Arduino 5v pin.
-
the GND pin at the Arduino GND pin
Program
This is the cooling system program.
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#include <dht11.h> #include <LiquidCrystal_I2C.h> #define DHT11PIN 2 // DATA -> Pin 2 #define ventilateurPIN 1 // Pin -> for Fan LiquidCrystal_I2C lcd(0x27, 20, 4); dht11 DHT11; void setup() { pinMode(ventilateurPIN,OUTPUT); //sets the Pin 2 digital of the Arduino in output mode lcd.init(); } void loop() { DHT11.read(DHT11PIN); lcd.backlight(); lcd.clear(); lcd.setCursor(0, 0); lcd.print("temperature= "); lcd.setCursor(0,1); lcd.print((float)DHT11.temperature); if ((float)DHT11.temperature >28) { digitalWrite(ventilateurPIN,HIGH); // the fan starts to turn } else { digitalWrite(ventilateurPIN,LOW); // the fan stops } delay(2000); } |
Note: both libraries must be downloaded DTH11 et I2c_LCD1602
You can also see
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