Circuit Documentation

Summary

This circuit is designed to control a DC motor using an L298N motor driver module, with a Raspberry Pi 4B as the main controller. The circuit also includes an OLED display to provide visual feedback on the motor's status. The motor's direction and speed are controlled by the Raspberry Pi 4B through GPIO pins connected to the L298N driver. The OLED display is interfaced with the Raspberry Pi 4B to show the current status of the motor, such as "FORWARD", "BACKWARD", and "STOPPED".

Component List

Raspberry Pi 4B

• Microcontroller board with multiple GPIO pins for interfacing with peripherals.
• Provides the processing power for controlling the motor driver and the OLED display.

L298N DC Motor Driver

• An H-bridge motor driver that allows for controlling the direction and speed of a DC motor.
• It receives control signals from the Raspberry Pi 4B and drives the motor accordingly.

DC Motor

• A simple electric motor that converts electrical energy into mechanical motion.
• It is driven by the L298N motor driver in this circuit.

OLED Display 2.42"

• A small display that provides visual feedback on the system status.
• It is controlled by the Raspberry Pi 4B via I2C communication.

Battery 12V

• A power source for the motor driver and the DC motor.
• It provides the necessary voltage and current to drive the motor.

Wiring Details

Raspberry Pi 4B

• GPIO2 connected to L298N IN1
• GPIO3 connected to L298N IN2
• GPIO4 connected to L298N IN3
• GPIO17 connected to L298N IN4
• GPIO27 connected to L298N ENA
• GPIO22 connected to L298N ENB
• 3V3 connected to OLED Display VCC
• GND connected to OLED Display GND, L298N GND, and Battery -
• GPIO5 connected to OLED Display SCK
• GPIO6 connected to OLED Display SDA
• GPIO12 connected to OLED Display RES
• GPIO13 connected to OLED Display DC
• GPIO19 connected to OLED Display CS

L298N DC Motor Driver

• OUT1 and OUT2 (not used in this circuit)
• 12V connected to Battery +
• GND connected to Raspberry Pi 4B GND and Battery -
• 5V, 5V-ENA-JMP-I, 5V-ENA-JMP-O, +5V-J1, +5V-J2 (not used in this circuit)
• OUT3 connected to DC Motor pin 2
• OUT4 connected to DC Motor pin 1
• ENA connected to Raspberry Pi 4B GPIO27
• IN1 connected to Raspberry Pi 4B GPIO2
• IN2 connected to Raspberry Pi 4B GPIO3
• IN3 connected to Raspberry Pi 4B GPIO4
• IN4 connected to Raspberry Pi 4B GPIO17
• ENB connected to Raspberry Pi 4B GPIO22

DC Motor

• pin 1 connected to L298N OUT4
• pin 2 connected to L298N OUT3

OLED Display 2.42"

• GND connected to Raspberry Pi 4B GND
• VCC connected to Raspberry Pi 4B 3V3
• SCK connected to Raspberry Pi 4B GPIO5
• SDA connected to Raspberry Pi 4B GPIO6
• RES connected to Raspberry Pi 4B GPIO12
• DC connected to Raspberry Pi 4B GPIO13
• CS connected to Raspberry Pi 4B GPIO19

Battery 12V

• + connected to L298N 12V
• - connected to Raspberry Pi 4B GND and L298N GND

Documented Code

/*
 * This Arduino Sketch controls a DC motor using an L298N motor driver and
 * displays status on an OLED display. The Raspberry Pi 4B is used to
 * interface with the motor driver and the OLED display. The motor is
 * controlled via GPIO pins connected to the L298N driver, and the OLED
 * display shows the motor status.
 */

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// Motor driver pins
const int IN1 = 2;
const int IN2 = 3;
const int IN3 = 4;
const int IN4 = 17;
const int ENA = 27;
const int ENB = 22;

void setup() {
  // Initialize motor driver pins
  pinMode(IN1, OUTPUT);
  pinMode(IN2, OUTPUT);
  pinMode(IN3, OUTPUT);
  pinMode(IN4, OUTPUT);
  pinMode(ENA, OUTPUT);
  pinMode(ENB, OUTPUT);

  // Initialize OLED display
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  display.display();
  delay(2000);
  display.clearDisplay();

  // Display initial message
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.println(F("Motor Control Initialized"));
  display.display();
}

void loop() {
  // Motor forward
  digitalWrite(IN1, HIGH);
  digitalWrite(IN2, LOW);
  digitalWrite(IN3, HIGH);
  digitalWrite(IN4, LOW);
  analogWrite(ENA, 255);
  analogWrite(ENB, 255);

  // Update display
  display.clearDisplay();
  display.setCursor(0, 0);
  display.println(F("Motor Status: FORWARD"));
  display.display();
  delay(2000);

  // Motor backward
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, HIGH);
  digitalWrite(IN3, LOW);
  digitalWrite(IN4, HIGH);
  analogWrite(ENA, 255);
  analogWrite(ENB, 255);

  // Update display
  display.clearDisplay();
  display.setCursor(0, 0);
  display.println(F("Motor Status: BACKWARD"));
  display.display();
  delay(2000);

  // Motor stop
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, LOW);
  digitalWrite(IN3, LOW);
  digitalWrite(IN4, LOW);
  analogWrite(ENA, 0);
  analogWrite(ENB, 0);

  // Update display
  display.clearDisplay();
  display.setCursor(0, 0);
  display.println(F("Motor Status: STOPPED"));
  display.display();
  delay(2000);
}

This code is designed to run on a Raspberry Pi 4B, which is not typically programmed using Arduino sketches. However, the code provided is written in the style of an Arduino sketch, which suggests that it may be intended for use with an Arduino-compatible environment on the Raspberry Pi, such as using the Arduino IDE with an add-on for Raspberry Pi GPIO programming.