Circuit Documentation

Summary

The circuit in question appears to be a smart control system designed to interface with various sensors and actuators. It includes two ESP32 microcontrollers, which are likely used for processing and communication purposes. The circuit can control an AC bulb via a 12v relay, which is triggered by one of the ESP32s. It also includes an LDR (Light Dependent Resistor) for light sensing, an IR transmitter and receiver for infrared communication, and a DHT22 sensor for measuring temperature and humidity. The power for the relay's coil is derived from the 3.3V supply of the ESP32, and the AC bulb is powered by a 240v power source.

Component List

ESP32 (30 pin)

• A microcontroller with WiFi and Bluetooth capabilities, featuring a variety of digital and analog pins.

12v Relay

• An electromechanical switch that allows the ESP32 to control high-power devices such as the AC bulb.

LDR (Light Dependent Resistor)

• A sensor that changes resistance based on the ambient light level.

GND (Ground)

• A common reference point for the electrical current in the circuit.

240v Power Source

• Provides the main power for the AC bulb.

AC Bulb

• A standard bulb that operates on 240v AC power.

IR Transmitter

• An infrared LED that can be used to send signals to other infrared-enabled devices.

DHT22

• A sensor used for measuring ambient temperature and humidity.

IR Receiver

• A module that can detect infrared signals from a remote control or transmitter.

Wiring Details

ESP32 (30 pin)

• D32 connected to the IN pin of the 12v Relay.
• GND connected to the GND pin of the 12v Relay and the GND pin of the LDR.
• 3V3 connected to the DC+ pin of the 12v Relay and the VCC pin of the LDR.
• D15 connected to the A0 pin of the LDR.
• D12 connected to the DAT pin of the IR Transmitter.
• D13 connected to the DATA pin of the IR Receiver.
• GND connected to the GND pins of the IR Transmitter and IR Receiver.
• 3V3 connected to the VCC pins of the IR Transmitter, IR Receiver, and DHT22.
• D15 connected to the DAT pin of the DHT22.

12v Relay

• IN connected to D32 on the ESP32.
• DC- connected to GND on the ESP32.
• DC+ connected to 3V3 on the ESP32.
• NO (Normally Open) connected to the P (Positive) pin of the AC Bulb.
• COM (Common) connected to the Live wire of the 240v Power Source.

LDR

• A0 connected to D15 on the ESP32.
• GND connected to GND on the ESP32.
• VCC connected to 3V3 on the ESP32.

AC Bulb

• P connected to the NO pin of the 12v Relay.
• N (Neutral) connected to the Neutral wire of the 240v Power Source.

IR Transmitter

• DAT connected to D12 on the ESP32.
• VCC connected to 3V3 on the ESP32.
• GND connected to GND on the ESP32.

DHT22

• DAT connected to D15 on the ESP32.
• VCC connected to 3V3 on the ESP32.
• GND connected to GND on the ESP32.

IR Receiver

• DATA connected to D13 on the ESP32.
• VCC connected to 3V3 on the ESP32.
• GND connected to GND on the ESP32.

Documented Code

No code was provided for the microcontrollers in the circuit. For this system to function, code would need to be written and uploaded to the ESP32 microcontrollers to handle input from the LDR and DHT22 sensors, control the relay to power the AC bulb, and manage IR communication with the IR transmitter and receiver. The code would likely include routines for reading sensor values, debounce logic for stable relay operation, and protocols for IR signal encoding and decoding.