DC-DC Converter Project for ESP32, DC Motor, and LCD Display

This project involves the development of a DC-DC converter that steps down 36V to 5V to power an ESP32 microcontroller, a DC motor, and an LCD 16x2 I2C display.

Overview

The system includes a DC-DC converter circuit and control logic to operate a DC motor and display relevant information on an I2C LCD. A push button triggers the system, turning on a red LED and sending a signal to a 2N2222 transistor to activate the motor. The 1N1007 diode is placed before the motor to prevent reverse current flow.

When the button is pressed, the message "DC motor running" is displayed on the LCD. Communication with the display is handled via the I2C protocol using the LiquidCrystal_I2C library.

Components

DC-DC Converter:

• Fuse
• LM7805 voltage regulator
• 0.33µF capacitor (input stabilization)
• 0.1µF capacitor (output noise filtering)

ESP32 Setup:

• LCD JHD-2x16-I2C
• ESP32 WROOM
• Red LED (SMD)
• Push button
• DC motor
• 2N2222 transistor
• 1N1007 diode

Assembly

• Eletronic Schematic:

• PCB Layout:

• 3D Visualization:

Functionality

• Button Press: Activates the motor for 10 seconds, turning on the red LED and signaling the 2N2222 transistor to power the motor.
• Current Protection: The 1N1007 diode prevents reverse current that could damage the circuit.
• Display: The message "DC motor running" is shown on the LCD when the motor is active.
• Noise Filtering: The capacitors are used for effective noise filtering and stabilization of the power supply, ensuring the smooth operation of the LM7805, which acts as the voltage converter.

This project highlights the integration of basic electronic components for power regulation and control, combining software and hardware for a simple yet functional motor control system.