Circuit Documentation

Summary

This circuit is designed to control a 12V white LED strip using an Arduino UNO and a motion sensor (HC-SR501). The circuit includes a TIP120 transistor to handle the high current required by the LED strip, and a 7805 voltage regulator to provide a stable 5V supply to the Arduino and the motion sensor. The motion sensor detects movement and sends a signal to the Arduino, which then controls the LED strip through the transistor.

Component List

1. Arduino UNO

   • Description: Microcontroller board based on the ATmega328P.
   • 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

2. HC-SR501 Motion Sensor

   • Description: Passive infrared (PIR) motion sensor.
   • Pins: GND, OUT, VCC

3. TIP120 Hi-Current Darlington Transistor

   • Description: NPN power transistor.
   • Pins: BASE, COLLECTOR, EMITTER

4. Resistor (10k Ohms)

   • Description: Resistor with a resistance of 10k Ohms.
   • Pins: pin1, pin2

5. 7805 Voltage Regulator

   • Description: 5V voltage regulator.
   • Pins: Vin, Gnd, Vout

6. 12V Power Supply

   • Description: 12V DC power supply.
   • Pins: +, -

7. 12V White LED Strip

   • Description: LED strip that operates at 12V.
   • Pins: +12V, GND

8. USB Power

   • Description: USB power supply.
   • Pins: +, -

Wiring Details

Arduino UNO

• D2 is connected to pin2 of the first 10k Ohm resistor.
• D9 is connected to pin1 of the second 10k Ohm resistor.
• 5V is connected to Vout of the 7805 voltage regulator.

HC-SR501 Motion Sensor

• OUT is connected to pin1 of the first 10k Ohm resistor.
• GND is connected to EMITTER of the TIP120 transistor, Gnd of the 7805 voltage regulator, and - of the 12V power supply.
• VCC is connected to Vout of the 7805 voltage regulator.

TIP120 Hi-Current Darlington Transistor

• BASE is connected to GND of the 12V white LED strip.
• COLLECTOR is connected to pin2 of the second 10k Ohm resistor.
• EMITTER is connected to Gnd of the 7805 voltage regulator, GND of the HC-SR501 motion sensor, and - of the 12V power supply.

Resistor (10k Ohms)

• First Resistor:
  • pin1 is connected to OUT of the HC-SR501 motion sensor.
  • pin2 is connected to D2 of the Arduino UNO.
• Second Resistor:
  • pin1 is connected to D9 of the Arduino UNO.
  • pin2 is connected to COLLECTOR of the TIP120 transistor.

7805 Voltage Regulator

• Vin is connected to + of the 12V power supply and +12V of the 12V white LED strip.
• Gnd is connected to EMITTER of the TIP120 transistor, GND of the HC-SR501 motion sensor, and - of the 12V power supply.
• Vout is connected to VCC of the HC-SR501 motion sensor and 5V of the Arduino UNO.

12V Power Supply

• + is connected to Vin of the 7805 voltage regulator and +12V of the 12V white LED strip.
• - is connected to Gnd of the 7805 voltage regulator, EMITTER of the TIP120 transistor, and GND of the HC-SR501 motion sensor.

12V White LED Strip

• +12V is connected to + of the 12V power supply and Vin of the 7805 voltage regulator.
• GND is connected to BASE of the TIP120 transistor.

Documented Code

Arduino UNO Code (sketch.ino)

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

}

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

}

Additional Documentation (documentation.txt)

This documentation provides a comprehensive overview of the circuit, including a summary, detailed component list, wiring details, and the code used in the Arduino UNO.