Hello Arduino! - Binary Thermometer

Project Description

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This was kind of my “Hello World!” project for the Arduino. The DHT11 will read temperature in Celsius and display the binary value of it via the 8 LEDs.

Parts List

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• Arduino Uno
• DHT11 Temperature and Humidity Sensor
• 8 LEDs
• 8 220 Ohm Resistors
• Breadboard
• Jumper Wires

Installation

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1. Connect the DHT11 to the Arduino as follows:
   • VCC to 5V
   • GND to GND
   • DATA to Pin 13
2. Connect the LEDs with resistors to the Arduino as follows:
   • LED 1 to Pin 1
   • LED 2 to Pin 2
   • LED 3 to Pin 3
   • LED 4 to Pin 4
   • LED 5 to Pin 5
   • LED 6 to Pin 6
   • LED 7 to Pin 7
   • LED 8 to Pin 8
3. Upload the code to the Arduino

   #include "DHT.h"
   #define DHTPIN 13
   #define DHTTYPE DHT11
   DHT dht(DHTPIN, DHTTYPE);
   
   const int NUM_LEDS = 8;
   int outputPins[NUM_LEDS] = {1, 2, 3, 4, 5, 6, 7, 8};
   
   void displayTemperature(int temperature) {
     byte tempByte = (byte)temperature;
   
     for (int i = 0; i < NUM_LEDS; i++) {
       bool bitState = bitRead(tempByte, i);
       digitalWrite(outputPins[i], bitState);
     }
   }
   
   void setup() {
     Serial.begin(9600);
     dht.begin();
   
     for (int i = 0; i < NUM_LEDS; i++) {
       pinMode(outputPins[i], OUTPUT);
     }
   }
   
   void loop() {
     delay(2000);
     int t = dht.readTemperature();
     Serial.println(t);
     displayTemperature(t);
   }