Circuit Documentation

Summary

This circuit integrates various components to form a system that likely serves as a sensor network with actuation capabilities. The Arduino UNO serves as the central microcontroller, interfacing with an ESP8266 ESP-02 WiFi module for wireless communication, a PIR sensor for motion detection, an LDR (Light Dependent Resistor) for light sensing, and a relay module for controlling an external circuit, which in this case is connected to an LED. The power supply provides the necessary voltage to the relay, which switches the LED on or off based on the control signal from the Arduino.

Component List

Arduino UNO

• Microcontroller board based on the ATmega328P
• Provides I/O pins for interfacing with various sensors and modules

1 Channel 5V Relay Module

• Electromechanical switch that allows control of a high power circuit by a low power signal
• Has Normally Open (N.O.), Common (COM), and Normally Closed (N.C.) terminals for switching

LDR (Light Dependent Resistor)

• A sensor that changes resistance based on the ambient light level
• Used to detect light intensity

PIR Sensor

• Passive Infrared Sensor used for motion detection
• Outputs a signal when motion is detected

LED: Two Pin (red)

• A simple red light-emitting diode
• Indicates the status of the relay or can be used as a general indicator

ESP8266 ESP-02 WiFi Module

• A WiFi module that enables wireless communication
• Can be used for remote monitoring and control

Power Supply

• Provides the necessary voltage and current to power the circuit components

Wiring Details

Arduino UNO

• 3.3V connected to ESP8266 ESP-02 WiFi Module VCC
• 5V connected to PIR sensor VDD, LDR VCC, and Relay Module VCC+
• GND connected to PIR sensor GND, LDR GND, Relay Module VCC- (GND), and ESP8266 ESP-02 WiFi Module GND
• A0 connected to LDR A0
• D4 connected to LDR D0
• D3 connected to Relay Module IN
• D2 connected to PIR sensor SIG
• D1 connected to ESP8266 ESP-02 WiFi Module RXD
• D0 connected to ESP8266 ESP-02 WiFi Module TXD

1 Channel 5V Relay Module

• VCC+ connected to Arduino UNO 5V
• VCC- (GND) connected to Arduino UNO GND
• IN connected to Arduino UNO D3
• N.O. connected to LED anode
• COM connected to Power Supply +

LDR

• A0 connected to Arduino UNO A0
• D0 connected to Arduino UNO D4
• GND connected to Arduino UNO GND
• VCC connected to Arduino UNO 5V

PIR Sensor

• VDD connected to Arduino UNO 5V
• SIG connected to Arduino UNO D2
• GND connected to Arduino UNO GND

LED: Two Pin (red)

• anode connected to Relay Module N.O.
• cathode connected to Power Supply -

ESP8266 ESP-02 WiFi Module

• VCC connected to Arduino UNO 3.3V
• GND connected to Arduino UNO GND
• TXD connected to Arduino UNO D0
• RXD connected to Arduino UNO D1

Power Supply

• + connected to Relay Module COM
• - connected to LED cathode

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:

}

The provided code is a template with empty setup() and loop() functions. The setup() function is intended for initialization code that runs once at startup, such as pin mode configurations. The loop() function contains the main logic of the program, which runs repeatedly after the setup() is complete. Actual implementation details need to be added to these functions based on the desired behavior of the circuit.