Circuit Documentation

Summary

This document provides a detailed overview of a circuit design that includes various sensors, actuators, and an ESP32 microcontroller. The circuit is designed to interface with multiple components such as an I2C LCD screen, pushbuttons, LEDs, a relay module, and various sensors including soil moisture, rain, ultrasonic, and temperature/humidity sensors. The circuit also includes a solar charge controller and a TP-Link router for connectivity.

Component List

I2C LCD 16x2 Screen

• Pins: SCL, SDA, VCC (5V), GND, VDD, VO, RS, RW, E, D0, D1, D2, D3, D4, D5, D6, D7, BLA, BLK
• Description: A 16x2 character LCD screen with I2C interface.

YL-83 Module LM393

• Pins: A0, D0, GND, VCC, -, +
• Description: A soil moisture sensor module.

Pushbutton

• Pins: Pin 3 (out), Pin 4 (out), Pin 1 (in), Pin 2 (in)
• Description: A simple pushbutton switch.

HC-SR04 Ultrasonic Sensor

• Pins: VCC, TRIG, ECHO, GND
• Description: An ultrasonic distance sensor.

LED: Two Pin (red)

• Pins: cathode, anode
• Description: A red LED.

LED: Two Pin (green)

• Pins: cathode, anode
• Description: A green LED.

LED: Two Pin (yellow)

• Pins: cathode, anode
• Description: A yellow LED.

YL-69 Sonda

• Pins: +, -
• Description: A soil moisture sensor probe.

2ch relay

• Pins: NC, COM, NO, VCC, IN2, IN1, GND
• Description: A 2-channel relay module.

12V Battery (mini)

• Pins: -, +
• Description: A 12V mini battery.

DHT22

• Pins: +, Out, -
• Description: A temperature and humidity sensor.

Mini Diaphragm Water Pump

• Pins: Positive (+), Negative (-)
• Description: A small water pump.

Plastic Solenoid Valve

• Pins: pin1, pin2
• Description: A plastic solenoid valve.

NPK Soil Sensor (mini)

• Pins: VCC, GND, A, B
• Description: A mini NPK soil sensor.

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 30-pin ESP32 microcontroller.

RAIN SENSOR

• Pins: AO, DO, GRD, VCC
• Description: A rain sensor module.

Solar Charge Controller

• Pins: Solar +, Solar -, Battery +, Battery -, Load +, Load -
• Description: A solar charge controller.

Solar Panel

• Pins: +, -
• Description: A solar panel.

TP-Link Router

• Pins: Power, POE, LAN
• Description: A TP-Link router for network connectivity.

Wiring Details

I2C LCD 16x2 Screen

• VCC (5V): Connected to ESP32 Vin
• GND: Connected to ESP32 GND
• SCL: Connected to ESP32 D22
• SDA: Connected to ESP32 D21

YL-83 Module LM393

• VCC: Connected to ESP32 Vin
• GND: Connected to ESP32 GND
• A0: Connected to ESP32 D33
• +: Connected to YL-69 Sonda +
• -: Connected to YL-69 Sonda -

Pushbutton

• Pin 1 (in): Connected to ESP32 D5
• Pin 2 (in): Connected to ESP32 D5
• Pin 3 (out): Connected to GND
• Pin 4 (out): Connected to GND

HC-SR04 Ultrasonic Sensor

• VCC: Connected to ESP32 Vin
• GND: Connected to ESP32 GND
• TRIG: Connected to ESP32 D12
• ECHO: Connected to ESP32 D13

LED: Two Pin (red)

• anode: Connected to ESP32 D32
• cathode: Connected to GND

LED: Two Pin (green)

• anode: Connected to ESP32 D14
• cathode: Connected to GND

LED: Two Pin (green)

• anode: Connected to ESP32 D27
• cathode: Connected to GND

LED: Two Pin (yellow)

• anode: Connected to ESP32 D26
• cathode: Connected to GND

LED: Two Pin (yellow)

• anode: Connected to ESP32 D25
• cathode: Connected to GND

YL-69 Sonda

• +: Connected to YL-83 Module LM393 +
• -: Connected to YL-83 Module LM393 -

2ch relay

• VCC: Connected to ESP32 Vin
• GND: Connected to ESP32 GND
• IN1: Connected to ESP32 D4
• IN2: Connected to ESP32 D2
• NO: Connected to Mini Diaphragm Water Pump Positive (+)
• NO: Connected to Plastic Solenoid Valve pin2
• COM: Connected to ESP32 Vin
• COM: Connected to ESP32 Vin

12V Battery (mini)

• +: Connected to Solar Charge Controller Battery +
• -: Connected to Solar Charge Controller Battery -

DHT22

• +: Connected to ESP32 Vin
• -: Connected to ESP32 GND
• Out: Connected to ESP32 D19

Mini Diaphragm Water Pump

• Positive (+): Connected to 2ch relay NO
• Negative (-): Connected to GND

Plastic Solenoid Valve

• pin1: Connected to GND
• pin2: Connected to 2ch relay NO

NPK Soil Sensor (mini)

• VCC: Connected to ESP32 Vin
• GND: Connected to ESP32 GND
• A: Connected to ESP32 VP
• B: Connected to ESP32 D23

ESP32 (30 pin)

• Vin: Connected to I2C LCD 16x2 Screen VCC (5V)
• GND: Connected to GND
• D5: Connected to Pushbutton Pin 1 (in)
• D22: Connected to I2C LCD 16x2 Screen SCL
• D21: Connected to I2C LCD 16x2 Screen SDA
• D19: Connected to DHT22 Out
• D14: Connected to LED: Two Pin (green) anode
• D27: Connected to LED: Two Pin (green) anode
• D26: Connected to LED: Two Pin (yellow) anode
• D25: Connected to LED: Two Pin (yellow) anode
• D32: Connected to LED: Two Pin (red) anode
• D33: Connected to YL-83 Module LM393 A0
• D12: Connected to HC-SR04 Ultrasonic Sensor TRIG
• D13: Connected to HC-SR04 Ultrasonic Sensor ECHO
• D4: Connected to 2ch relay IN1
• D2: Connected to 2ch relay IN2
• VP: Connected to NPK Soil Sensor (mini) A
• D34: Connected to RAIN SENSOR AO
• D35: Connected to RAIN SENSOR DO

RAIN SENSOR

• VCC: Connected to ESP32 Vin
• GRD: Connected to GND
• AO: Connected to ESP32 D34
• DO: Connected to ESP32 D35

Solar Charge Controller

• Solar +: Connected to Solar Panel +
• Solar -: Connected to Solar Panel -
• Battery +: Connected to 12V Battery (mini) +
• Battery -: Connected to 12V Battery (mini) -
• Load +: Connected to TP-Link Router Power

Solar Panel

• +: Connected to Solar Charge Controller Solar +
• -: Connected to Solar Charge Controller Solar -

TP-Link Router

• Power: Connected to Solar Charge Controller Load +

Documented Code

ESP32 (30 pin)