Circuit Documentation

Summary

The circuit in question is a complex system that integrates various components including relays, sensors, a microcontroller, a stepper motor, and an LED strip. The primary control unit is an Arduino UNO microcontroller, which interfaces with a ULN2003 driver to control a 28BYJ-48 stepper motor. The circuit also includes PIR sensors for motion detection and IR sensors for object detection. A relay module is used to switch higher power loads, such as a fan and an LED strip. The system is designed to operate on a 5V supply for logic components and may require a 12V supply for the LED strip.

Component List

Relay 4 Channel 5v

• Description: A 4-channel relay module capable of controlling higher power loads.
• Pins: GND, IN1, IN2, IN3, IN4, VCC, COM1, COM2, COM3, COM4, NO1, NO2, NO3, NO4, NC1, NC2, NC3, NC4

LED Strip

• Description: A strip of LEDs that operates at 12V.
• Pins: B, +12V, R, G

Fan

• Description: A 5V fan used for cooling purposes.
• Pins: GND, 5V

Arduino UNO

• Description: A 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

ULN 2003

• Description: A 7-channel Darlington array used for driving high-current loads.
• Pins: IN1, IN2, IN3, IN4, IN5, IN6, IN7, GND, +, COIL1, COIL2, COIL3, COIL4, COIL5

PIR Sensor

• Description: A passive infrared sensor used for motion detection.
• Pins: VDD, SIG, GND

ESP32 (30 pin)

• Description: A microcontroller with Wi-Fi and Bluetooth capabilities.
• Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, Vin, D23, D22, TX0, RX0, D21, D19, D18, D5, TX2, RX2, D4, D2, D15, 3V3

28BYJ-48 Stepper Motor

• Description: A small, 5-wire, unipolar stepper motor.
• Pins: BLUE, PINK, YELLOW, ORANGE, RED

IR Sensor

• Description: An infrared sensor used for object detection.
• Pins: out, gnd, vcc

Wiring Details

Relay 4 Channel 5v

• COM1 connected to Fan (5V)
• COM2 connected to LED Strip (+12V)
• COM3 connected to Arduino UNO (5V), ULN 2003 (+), and PIR Sensors (VDD)
• COM4 connected to IR Sensors (vcc) and Arduino UNO (5V)

LED Strip

• +12V connected to Relay 4 Channel 5v (COM2)

Fan

• 5V connected to Relay 4 Channel 5v (COM1)

Arduino UNO

• 5V connected to Relay 4 Channel 5v (COM3 and COM4)
• GND connected to ULN 2003 (GND) and PIR Sensors (GND)
• D11 connected to ULN 2003 (IN4)
• D10 connected to ULN 2003 (IN3)
• D9 connected to ULN 2003 (IN2)
• D8 connected to ULN 2003 (IN1)
• D3 connected to PIR Sensor (SIG) and IR Sensor (out)
• D2 connected to PIR Sensor (SIG) and IR Sensor (out)

ULN 2003

• IN1 to IN4 connected to Arduino UNO (D8 to D11)
• COIL1 to COIL5 connected to 28BYJ-48 Stepper Motor (BLUE to RED)
• GND connected to Arduino UNO (GND)
• • connected to Relay 4 Channel 5v (COM3)

PIR Sensor

• VDD connected to Relay 4 Channel 5v (COM3)
• SIG connected to Arduino UNO (D2 and D3)
• GND connected to Arduino UNO (GND)

IR Sensor

• vcc connected to Relay 4 Channel 5v (COM4)
• out connected to Arduino UNO (D2 and D3)
• gnd connected to Arduino UNO (GND)

28BYJ-48 Stepper Motor

• BLUE to RED connected to ULN 2003 (COIL1 to COIL5)

Documented Code

Arduino UNO (Instance 1)

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

}

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

}

Arduino UNO (Instance 2)

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

}

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

}

(Note: The code provided for both instances of the Arduino UNO is a template and does not contain any functional code specific to the circuit's operation. Additional code would be required to control the components as per the circuit design.)