Circuit Documentation

Summary

This circuit is designed to control a bulb using a motion sensor and a relay, all managed by an Arduino UNO. When motion is detected by the HC-SR501 motion sensor, the Arduino UNO triggers the 5V relay to turn on the bulb. The circuit is powered by an AC source.

Component List

1. AC Source

   • Description: Provides AC power to the circuit.
   • Pins: +, -

2. 5V Relay

   • Description: Acts as a switch to control the bulb based on the signal from the Arduino.
   • Pins: Normally Open, Common terminal, Normally Closed, In, GND, VCC

3. HC-SR501 Motion Sensor

   • Description: Detects motion and sends a signal to the Arduino.
   • Pins: GND, OUT, VCC

4. Bulb

   • Description: The load that is controlled by the relay.
   • Pins: GND, power

5. Arduino UNO

   • Description: Microcontroller that processes the signal from the motion sensor and controls the relay.
   • Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0

Wiring Details

AC Source

• +: Connected to the Common terminal of the 5V relay.
• -: Connected to the GND of the bulb.

5V Relay

• VCC: Connected to the 5V pin of the Arduino UNO and the VCC pin of the HC-SR501 motion sensor.
• GND: Connected to the GND pin of the Arduino UNO and the GND pin of the HC-SR501 motion sensor.
• In: Connected to the D3 pin of the Arduino UNO.
• Normally Open: Connected to the power pin of the bulb.
• Common terminal: Connected to the + pin of the AC source.

HC-SR501 Motion Sensor

• GND: Connected to the GND pin of the Arduino UNO and the GND pin of the 5V relay.
• OUT: Connected to the D2 pin of the Arduino UNO.
• VCC: Connected to the 5V pin of the Arduino UNO and the VCC pin of the 5V relay.

Bulb

• GND: Connected to the - pin of the AC source.
• Power: Connected to the Normally Open pin of the 5V relay.

Arduino UNO

• 5V: Connected to the VCC pin of the 5V relay and the VCC pin of the HC-SR501 motion sensor.
• GND: Connected to the GND pin of the 5V relay and the GND pin of the HC-SR501 motion sensor.
• D3: Connected to the In pin of the 5V relay.
• D2: Connected to the OUT pin of the HC-SR501 motion sensor.

Documented Code

sketch.ino

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

documentation.txt