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This guide explains how to connect a temperature sensor (e.g., LM35) and LEDs to an Arduino to indicate temperature levels visually.
Step 1: Gather Components
Arduino Uno
LM35 Temperature Sensor
3 LEDs (Red, Green, Blue)
3 Resistors (220Ω each)
Breadboard and Jumper Wires
Step 2: Circuit Connections
Temperature Sensor (LM35): Connect the left pin of the LM35 to the Arduino's 5V. Connect the middle pin to A2 (analog input). Connect the right pin to GND.
LEDs: Connect the cathode (short leg) of each LED to GND via a 220Ω resistor. Connect the anode (long leg) of: Red LED to Pin 4. Green LED to Pin 3. Blue LED to Pin 2.
Step 3: Upload Code
Use the following Arduino code to read temperature and control LEDs based on thresholds:
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