L298N DC Motor Driver Conundrum

Using Arduino Motors, Mechanics, Power and CNC
1

I am trying to control a single DC motor using a L298N DC Motor Driver. I have a 12V motor plugged into Out1 and Out2, a 7.4 volt battery wired to the 12v in and common ground, a m/m common ground going from the arduino grnd to the L298N common ground, and I have IN1 and IN2 connected to digital pins 2 and 3. I am powering the Uno with USB. I am also running a m/m wire from the Uno 5v to the L298N (I shouldn't have to) in order to power the L298N

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I am using a basic code to test the motor

> int motor1pin1 = 2;
>     int motor1pin2 = 3;
>     
>     void setup() {
>       pinMode(motor1pin1, OUTPUT);
>       pinMode(motor1pin2, OUTPUT);
>      
>     }
>     
>     void loop() {  
>       digitalWrite(motor1pin1, HIGH);
>       digitalWrite(motor1pin2, LOW);
>     
>       delay(1000);
>     
>       digitalWrite(motor1pin1, LOW);
>       digitalWrite(motor1pin2, HIGH);
>     
>       delay(1000);
>     }

If I wire the 7.4v lipo battery directly to the L298N the red led doesn't go on. It only goes on when I run a 5V wire from the Uno to the L298N. Yet still I get no reaction out of the motor. However if I run a ground from the arduino directly to the out1 or out2, the motor turns in that one direction. Anyone have an idea what I am doing wrong?

2

Hi,
Instead of that Fritzy image can you please draw your circuit with pen(cil) and paper.
Please include your power supplies and component labels and pin names.

Do you have a DMM?

Thanks.. Tom... :grinning: :+1: :coffee: :australia:

3

Your old driver chip will drop about 4V so that only 4V arrive at your 12V motor. Try 15V (2 batteries) or use a modern MOSFET driver.

4

There are straps on the L298 board that selects things. Check them up!

5

I know it's enough voltage to turn the motor though because when I touch an additional ground from the arduino to the Out1 or Out2 the motor turns in that direction

6

Doing so may have already killed the output transistors of the driver :frowning:

7

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