Circuit Documentation

Summary

This circuit is designed to control various devices such as water pumps, a valve solenoid, and to interact with a user through rotary encoders and a pushbutton. The central processing unit is an ESP32 microcontroller, which manages input from the rotary encoders and the pushbutton, and controls the relay module to switch the water pumps and valve solenoid. The circuit also includes an LCD display for user interface, which is connected to the ESP32 via I2C communication. Power management is handled by two LM2596 Step Down Modules, which provide regulated voltage to the components.

Component List

ESP32 (30 pin)

• Microcontroller with WiFi and Bluetooth capabilities.
• It has a variety of digital I/O pins and supports serial communication.

Relay 4 Channel 5v

• A module with 4 relays that can control high power devices.
• Each relay has a Normally Open (NO) and a Normally Closed (NC) contact.

Rotary Encoder (x3)

• Input devices that provide rotational position feedback.
• Each encoder has a clock, data, and switch pin for interfacing.

Pushbutton

• A simple switch that connects two contacts when pressed.

LCD Display 16x4 I2C

• An alphanumeric liquid crystal display with 16 characters per line and 4 lines.
• Uses I2C communication for interfacing with the microcontroller.

LM2596 Step Down Module (x2)

• Voltage regulators that step down input voltage to a lower output voltage.
• Each module has input and output terminals for voltage and ground.

Water Pump (x2)

• Pumps used for moving water.
• Each pump has a voltage and ground connection.

Valve Solenoid Water

• An electrically-controlled valve used for controlling the flow of water.

Wiring Details

ESP32 (30 pin)

• Vin connected to power supply along with Rotary Encoders and LCD Display.
• GND connected to common ground.
• D32, D33, D25 connected to Relay 4 Channel inputs IN3, IN2, IN1 respectively.
• D26, D27, D14, D12, D13 connected to Rotary Encoders' clk, dt, sw pins respectively.
• D22, D21 connected to LCD Display's SCL, SDA pins for I2C communication.
• D19, D18, D5, D4, D15 connected to Rotary Encoders' dt, clk, sw pins and Pushbutton's Pin 4 (out) respectively.

Relay 4 Channel 5v

• VCC connected to LM2596 Step Down Module's OUT+.
• GND connected to common ground.
• IN1, IN2, IN3 controlled by ESP32 pins D25, D33, D32.
• COM1 connected to LM2596 Step Down Module's OUT+.
• COM2, COM3 connected to LM2596 Step Down Module's IN+.
• NO1, NO2, NO3 connected to Valve Solenoid Water's IN01 and Water Pumps' VCC.

Rotary Encoder (x3)

• clk, dt, sw pins connected to ESP32's D26, D27, D14, D12, D13, D19, D18, D5, D4.
• + pin connected to power supply.
• gnd pin connected to common ground.

Pushbutton

• Pin 1 (in) connected to common ground.
• Pin 4 (out) connected to ESP32's D15.

LCD Display 16x4 I2C

• SCL, SDA pins connected to ESP32's D22, D21 for I2C communication.
• VCC connected to power supply.
• GND connected to common ground.

LM2596 Step Down Module (x2)

• OUT+, OUT- connected to Relay 4 Channel VCC and GND.
• IN+, IN- connected to power supply and common ground.

Water Pump (x2)

• VCC connected to Relay 4 Channel NO2, NO3.
• GND connected to common ground.

Valve Solenoid Water

• IN01 connected to Relay 4 Channel NO1.
• IN02 connected to common ground.

Documented Code

There is no code provided for the microcontroller. The code would typically include initialization of the I/O pins, setup of the I2C communication for the LCD display, and the main loop handling the logic for reading the rotary encoders, debouncing the pushbutton, and controlling the relay module based on the inputs.