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ESP32-Based Wi-Fi Controlled Robotic Car with OLED Display and Laser Shooting

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Circuit Documentation

Summary

This circuit is designed to control a motorized system using an ESP32 microcontroller, a TB6612FNG motor driver, and various other components. The system includes a 0.96" OLED display for visual feedback, a piezo buzzer for audio alerts, and a laser controlled by a MOSFET. The circuit also features a photocell (LDR) for light detection and a rocker switch for power control. The ESP32 is programmed to interface with a PS3 controller for remote control of the motors and laser.

Component List

  1. DC Mini Metal Gear Motor

    • Description: A small DC motor with metal gears for increased torque.
    • Pins: IN1, IN2

  2. TB6612FNG Motor Driver

    • Description: A dual motor driver capable of controlling two DC motors.
    • Pins: GND, B01, B02, A02, A01, VCC, VM, PWMB, BI2, BI1, STBY, AI1, AI2, PWMA

  3. 0.96" OLED

    • Description: A small OLED display for visual feedback.
    • Pins: GND, VDD, SCK, SDA

  4. ESP32 Devkit V1

    • Description: A powerful microcontroller with Wi-Fi and Bluetooth capabilities.
    • Pins: 3V3, GND, D15, D2, D4, RX2, TX2, D5, D18, D19, D21, RX0, TX0, D22, D23, EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, VIN

  5. Mosfet

    • Description: A transistor used for switching and amplifying electronic signals.
    • Pins: Gate, Drain, Source

  6. 12v Battery

    • Description: A power source providing 12V DC.
    • Pins: +, -

  7. Mini-360 DC-DC Step Down Buck Converter

    • Description: A voltage regulator that steps down 12V to a lower voltage.
    • Pins: Input -, Input +, Output +, Output -

  8. LED bulb AC / Bombillo AC

    • Description: An AC-powered LED bulb.
    • Pins: +, -

  9. Rocker Switch (SPST)

    • Description: A single-pole single-throw switch for power control.
    • Pins: 1, 2

  10. Photocell (LDR)

    • Description: A light-dependent resistor used for light detection.
    • Pins: pin 0, pin 1

  11. Piezo Buzzer

    • Description: A small speaker used for audio alerts.
    • Pins: pin 1, pin 2

  12. Resistor (51k Ohms)

    • Description: A resistor with a resistance of 51k Ohms.
    • Pins: pin1, pin2

  13. Resistor (220 Ohms)

    • Description: A resistor with a resistance of 220 Ohms.
    • Pins: pin1, pin2

Wiring Details

DC Mini Metal Gear Motor

  • IN1 connected to B01 of TB6612FNG Motor Driver
  • IN2 connected to B02 of TB6612FNG Motor Driver

TB6612FNG Motor Driver

  • GND connected to - of 12v Battery and Input - of Mini-360 DC-DC Step Down Buck Converter
  • B01 connected to IN1 of DC Mini Metal Gear Motor
  • B02 connected to IN2 of DC Mini Metal Gear Motor
  • A02 connected to IN1 of another DC Mini Metal Gear Motor
  • A01 connected to IN2 of another DC Mini Metal Gear Motor
  • VCC connected to 3V3 of ESP32 Devkit V1
  • VM connected to 2 of Rocker Switch (SPST)
  • PWMB connected to D5 of ESP32 Devkit V1
  • BI2 connected to TX2 of ESP32 Devkit V1
  • BI1 connected to RX2 of ESP32 Devkit V1
  • STBY connected to 3V3 of ESP32 Devkit V1
  • AI1 connected to D4 of ESP32 Devkit V1
  • AI2 connected to D2 of ESP32 Devkit V1
  • PWMA connected to D15 of ESP32 Devkit V1

0.96" OLED

  • GND connected to GND of ESP32 Devkit V1
  • VDD connected to 3V3 of ESP32 Devkit V1
  • SCK connected to D22 of ESP32 Devkit V1
  • SDA connected to D21 of ESP32 Devkit V1

ESP32 Devkit V1

  • GND connected to GND of Piezo Buzzer, Source of Mosfet, pin1 of Resistor (51k Ohms), GND of 0.96" OLED, and Output - of Mini-360 DC-DC Step Down Buck Converter
  • 3V3 connected to pin 1 of Photocell (LDR), STBY and VCC of TB6612FNG Motor Driver, + of LED bulb AC / Bombillo AC, and VDD of 0.96" OLED
  • D22 connected to SCK of 0.96" OLED
  • D21 connected to SDA of 0.96" OLED
  • D5 connected to PWMB of TB6612FNG Motor Driver
  • TX2 connected to BI2 of TB6612FNG Motor Driver
  • RX2 connected to BI1 of TB6612FNG Motor Driver
  • D4 connected to AI1 of TB6612FNG Motor Driver
  • D2 connected to AI2 of TB6612FNG Motor Driver
  • D15 connected to PWMA of TB6612FNG Motor Driver
  • VIN connected to Output + of Mini-360 DC-DC Step Down Buck Converter
  • D18 connected to Gate of Mosfet
  • D12 connected to pin1 of Resistor (220 Ohms)
  • D13 connected to pin 0 of Photocell (LDR) and pin2 of Resistor (51k Ohms)

Mosfet

  • Gate connected to D18 of ESP32 Devkit V1
  • Drain connected to - of LED bulb AC / Bombillo AC
  • Source connected to GND of ESP32 Devkit V1

12v Battery

  • + connected to 2 of Rocker Switch (SPST) and VM of TB6612FNG Motor Driver
  • - connected to GND of TB6612FNG Motor Driver and Input - of Mini-360 DC-DC Step Down Buck Converter

Mini-360 DC-DC Step Down Buck Converter

  • Input - connected to - of 12v Battery and GND of TB6612FNG Motor Driver
  • Input + connected to 1 of Rocker Switch (SPST)
  • Output + connected to VIN of ESP32 Devkit V1
  • Output - connected to GND of ESP32 Devkit V1

LED bulb AC / Bombillo AC

  • + connected to 3V3 of ESP32 Devkit V1
  • - connected to Drain of Mosfet

Rocker Switch (SPST)

  • 1 connected to Input + of Mini-360 DC-DC Step Down Buck Converter
  • 2 connected to + of 12v Battery and VM of TB6612FNG Motor Driver

Photocell (LDR)

  • pin 0 connected to D13 of ESP32 Devkit V1 and pin2 of Resistor (51k Ohms)
  • pin 1 connected to 3V3 of ESP32 Devkit V1

Piezo Buzzer

  • pin 1 connected to GND of ESP32 Devkit V1
  • **