I am trying to make a small 2 wheel car but one of the wheels is only turning one way. The other motor is connected to a different channel on my L298N motor driver and works fine both ways, i tried connecting another motor to the potentially faulty channel and it does the same thing - only turns when i send the letter N through the serial terminal. Should i replace the motor driver or is the issue in my code or wiring? #include "Arduino.h" #include const byte rxPin = 9; const byte txPin = 8; int in1 = 5; int in2 = 4; int in3 = 12; int in4 = 6; SoftwareSerial BTSerial(rxPin, txPin); // RX TX void setup() { // define pin modes for tx, rx: pinMode(rxPin, INPUT); pinMode(txPin, OUTPUT); BTSerial.begin(9600); Serial.begin(9600); pinMode(13, OUTPUT); pinMode(in1, OUTPUT); pinMode(in2, OUTPUT); pinMode(in3, OUTPUT); pinMode(in4, OUTPUT); pinMode(7, OUTPUT); } String messageBuffer = ""; String message = ""; void loop() { while (BTSerial.available() > 0) { char data = (char) BTSerial.read(); messageBuffer += data; if (data == 'n'){ message = messageBuffer; messageBuffer = ""; digitalWrite(in3, HIGH); digitalWrite(in4, LOW); digitalWrite(in1, HIGH); digitalWrite(in2, LOW); digitalWrite(7, HIGH); delay(1000); digitalWrite(7, LOW); } if (data == 'b'){ message = messageBuffer; messageBuffer = ""; digitalWrite(in1, LOW); digitalWrite(in2, HIGH); digitalWrite(in3, LOW); digitalWrite(in4, HIGH); digitalWrite(7, HIGH); delay(1000); digitalWrite(7, LOW); } } }

Remove the jumpers ATV_A and ATV_B and connect wires to Arduino pins as shown below. [Captura de tela de 2023-02-14 14.00.43] [Captura de tela de 2023-02-14 14.00.07]

[image] tishadev: The other motor is connected to a different channel on my L298N motor driver [image] How to make a schematic you can post. Introductory Tutorials When you submit a question on the forum you will usually need to add a schematic (circuit diagram). The tutorial that follows will explain some ways to create a useful image; however lets start by explaining how to add the image to your post. Its easy. Having created the image all you need to do is : Save the image somewhere convenient - maybe your desktop Start your post, and place the cursor (insertion point) where you want the image to be shown; [upload image to forum] 3: click th…

I believe that you forgot the enable pin. Show us how it's wired. Also take a look in this tutorial. [image] In-Depth: Control DC Motors with L293D Motor Driver IC & Arduino Learn about L293D DC Motor Driver IC along with PWM, H-bridge Working, Pinout, Wiring, Arduino Code for controlling speed & direction of two DC motors. Estimated reading time: 10 minutes PS. is not the same IC but I believe that the logic is the same. Edit: You are using pin 7 to enable both motors. Are 3 pins per motor as you can see in this example: // Motor A connections int enA = 9; int in1 = 8; int in2 = 7; // Motor B connections int enB = 3; int in3 = 5; int in4 = 4; void setup() { // Set all the motor control pins to outputs pinMode(enA, OUTPUT); pinMode(enB, OUTPUT); pinMode(in1, OUTPUT); pinMode(in2, OUTPUT); pinMode(in3, OUTPUT); pinMode(in4, OUTPUT); // Turn off motors - Initial state digitalWrite(in1, LOW); digitalWrite(in2, LOW); digitalWrite(in3, LOW); digitalWrite(in4, LOW); } void loop() { directionControl(); delay(1000); speedControl(); delay(1000); } // This function lets you control spinning direction of motors void directionControl() { // Set motors to maximum speed // For PWM maximum possible values are 0 to 255 analogWrite(enA, 255); analogWrite(enB, 255); // Turn on motor A & B digitalWrite(in1, HIGH); digitalWrite(in2, LOW); digitalWrite(in3, HIGH); digitalWrite(in4, LOW); delay(2000); // Now change motor directions digitalWrite(in1, LOW); digitalWrite(in2, HIGH); digitalWrite(in3, LOW); digitalWrite(in4, HIGH); delay(2000); // Turn off motors digitalWrite(in1, LOW); digitalWrite(in2, LOW); digitalWrite(in3, LOW); digitalWrite(in4, LOW); } // This function lets you control speed of the motors void speedControl() { // Turn on motors digitalWrite(in1, LOW); digitalWrite(in2, HIGH); digitalWrite(in3, LOW); digitalWrite(in4, HIGH); // Accelerate from zero to maximum speed for (int i = 0; i = 0; --i) { analogWrite(enA, i); analogWrite(enB, i); delay(20); } // Now turn off motors digitalWrite(in1, LOW); digitalWrite(in2, LOW); digitalWrite(in3, LOW); digitalWrite(in4, LOW); }

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ah sorry that mightve been confusing but pin 7 is an led, i put it so i could see if i was getting a message received from my phone which has a bluetooth terminal app.

The photos are useless to us. Please post a photo of a hand-drawn wiring diagram, with pins and connections clearly labeled.

Try the example above. This pics doesn't help so much.

@johnerrington yeah i put some pictures below

will i have to remove the extra headers on the sides of the middle pins on the motor controller to use the ENA pins?

Motor only turns in one direction, while the other is fine

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johnerrington February 14, 2023, 4:22pm 2

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Motor only turns in one direction, while the other is fine

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