Circuit Documentation

Summary

This document provides a detailed overview of a circuit designed to interface an ESP32 microcontroller with various sensors and actuators. The circuit includes a DHT22 temperature and humidity sensor, a YL-69 soil moisture sensor, a 1-Channel Relay to control a Plastic Solenoid Valve, and a power supply module. The ESP32 serves as the central processing unit, reading sensor data and controlling the relay based on programmed logic.

Component List

DHT22 Temperature and Humidity Sensor

• Pins: +, Out, -
• Description: A sensor used to measure the ambient temperature and humidity.

Humidity YL-69 Soil Moisture Sensor

• Pins: A0, D0, GND, VCC
• Description: A sensor used to measure the moisture level in soil.

Terminal Block (4 Positions)

• Pins: 1, 2, 3, 4, 5, 6, 7, 8
• Description: A connector used to organize and secure wiring.

1-Channel Relay (5V 10A)

• Pins: NC, signal, C, power, NO, ground
• Description: An electromechanical switch used to control high power devices.

ESP32 (30 pin)

• 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
• Description: A microcontroller with Wi-Fi and Bluetooth capabilities, used for processing and controlling the circuit.

Plastic Solenoid Valve

• Pins: pin1, pin2
• Description: An electrically-controlled valve used to control the flow of liquid.

Power Supply (220V)

• Pins: hot wire, neutral wire
• Description: A module that provides power to the circuit.

Wiring Details

DHT22 Temperature and Humidity Sensor

• + connected to ESP32 3V3
• Out connected to ESP32 D2
• - connected to ESP32 GND

Humidity YL-69 Soil Moisture Sensor

• A0 connected to ESP32 D18
• D0 connected to ESP32 D19
• GND connected to Terminal Block 7
• VCC connected to Terminal Block 3

Terminal Block (4 Positions)

• 1 connected to Relay power
• 2, 4 connected to ESP32 Vin
• 5 connected to Relay ground
• 6, 8 connected to ESP32 GND
• 3 connected to YL-69 VCC
• 7 connected to YL-69 GND

1-Channel Relay (5V 10A)

• NC not connected
• signal connected to ESP32 D14
• C connected to Solenoid Valve pin1
• power connected to Terminal Block 1
• NO connected to Power Supply neutral wire
• ground connected to Terminal Block 5

Plastic Solenoid Valve

• pin1 connected to Relay C
• pin2 connected to Power Supply hot wire

Power Supply (220V)

• hot wire connected to Solenoid Valve pin2
• neutral wire connected to Relay NO

Documented Code

ESP32 Microcontroller Code (sketch.ino)

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

}

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

}

Note: The code provided is a template and does not contain any functional logic. It needs to be populated with the necessary instructions to read sensor data, process it, and control the relay accordingly.