Aim:
To collect and display live sensor readings from a temperature or light sensor.

Requirements:

• Arduino Uno or Raspberry Pi Pico

• LM35 temperature sensor or LDR (light-dependent resistor)

• Breadboard and jumper wires

• USB cable

• Computer with Arduino IDE (for Arduino) or Thonny IDE (for Pico)

Procedure (Step-by-Step)

1. Set Up Your Microcontroller
   • Connect the Arduino/Pico to your computer using a USB cable.

   • Open the appropriate coding software (Arduino IDE or Thonny).

2. Connect the Sensor
   • LM35:
     • Vcc → 5V

     • GND → Ground

     • Output → Analog pin (e.g., A0)

   • LDR:
     • One leg to 5V

     • Other leg to A0 with a resistor to GND.

3. Write the Code

Arduino Example:

cpp
CopyEdit
int sensorValue = analogRead(A0);

Serial.println(sensorValue);

delay(1000); // wait 1 second

•  
• This reads the sensor value every second and prints it.

1. Upload and Run the Code
   • Click the Upload button in Arduino IDE or run in Thonny.

2. Open the Serial Monitor / Python Shell
   • For Arduino: Tools → Serial Monitor.

   • For Pico: Use print() in Python to display in Thonny Shell.

3. Observe the Data
   • For LM35: Temperature changes when you touch or heat it.

   • For LDR: Values change when you shine light or cover it.

4. Record Observations
   • Note how fast the readings change.
   • Compare values under different conditions.