L298N motor drive not working when using battery power src

[mannok]

Hi everyone...
I have finish building my robot car... but seems that there is problem in power supply and I am seeking for your help.
I am now using this model.

At the moment, My car can work if I supply power from RPi 5V power pin... (But the power is so weak, the motor turn so slow)... here is the schematics.


So, I have change the design to supply power to the L298N by 4x1.5V battery... schematics:

However, the motor won't even move. I am getting very confuse!!!!!!

Anyone can help me to solve the problem?
btw... My circuit design is quite similar to this video:
https://www.youtube.com/watch?v=b4uhh_j8uR0 (I am not using the battery to supply power to the Pi, I use micro USB to supply power the Pi)

[gordon77]

I would suggest connecting the pwr gnd to battery -ve and the pi gnd, l think they did that in the video.

[mannok]

I would suggest connecting the pwr gnd to battery -ve and the pi gnd, l think they did that in the video.

I am not able to test it now. I will try it after an hour later. May I know how come you said that?
btw... the 298N showing me a green light... seems there is a problem in power supply

[gordon77]

And 5v from the Pi to 5v terminal, as in the video

And the 5v enable link isn't fitted in the video.

[mannok]

And 5v from the Pi to 5v terminal, as in the video

And the 5v enable link isn't fitted in the video.

Seems that he wants to supply power to Pi by battery cells so he connect in this form

[gordon77]

I dont think so, his pi is powered by the micro usb plug.

Isnt it a 5v input to the 298n? I cant find a datasheet for this board.

[joan]

I dont think so, his pi is powered by the micro usb plug.

Isnt it a 5v input to the 298n? I cant find a datasheet for this board.

If the L298N motor board 5V jumper is in place then the logic 5V required is derived from the motor supply and 5V must NOT be supplied by the Pi.

[mannok]

I dont think so, his pi is powered by the micro usb plug.

Isnt it a 5v input to the 298n? I cant find a datasheet for this board.

Seems I find the problem, but I dont know the soulution... I place the jumper to enableA. Acually, there are two pin for enableA, what is the mean of each?

[gordon77]

I dont think so, his pi is powered by the micro usb plug.

Isnt it a 5v input to the 298n? I cant find a datasheet for this board.

If the L298N motor board 5V jumper is in place then the logic 5V required is derived from the motor supply and 5V must NOT be supplied by the Pi.

Thanks. Datasheet anywhere?

[joan]

I dont think so, his pi is powered by the micro usb plug.

Isnt it a 5v input to the 298n? I cant find a datasheet for this board.

Seems I find the problem, but I dont know the soulution... I place the jumper to enableA. Acually, there are two pin for enableA, what is the mean of each?

There is one enable pin for each motor. I suggest you leave them jumpered so both A and B outputs are enabled.

Motor A has two inputs, IN1 and IN2. Connect IN1 and IN2 to gpios (through a resistor if you prefer). Set one gpio high and the other low, the motor will move in one direction. Change to one gpio low, the other high to change direction. If both gpios are high or both gpios are low the motor will stop.

[joan]

I dont think so, his pi is powered by the micro usb plug.

Isnt it a 5v input to the 298n? I cant find a datasheet for this board.

If the L298N motor board 5V jumper is in place then the logic 5V required is derived from the motor supply and 5V must NOT be supplied by the Pi.

Thanks. Datasheet anywhere?

I'm not aware of one. I think people look at the chips and then follow the tracks to work out what is going on.

[BMS Doug]

The 5v produced by the on board voltage regulator is not stable enough to run a pi (it fluctuates when the motors are driven) so should not be used (as you don't want two seperate 5v supplies to the same device, especially if one of them is fluctuating).

If the jumper is removed then the pi can supply the 5v to the board.

[mannok]

I dont think so, his pi is powered by the micro usb plug.

Isnt it a 5v input to the 298n? I cant find a datasheet for this board.

Seems I find the problem, but I dont know the soulution... I place the jumper to enableA. Acually, there are two pin for enableA, what is the mean of each?

There is one enable pin for each motor. I suggest you leave them jumpered so both A and B outputs are enabled.

Motor A has two inputs, IN1 and IN2. Connect IN1 and IN2 to gpios (through a resistor if you prefer). Set one gpio high and the other low, the motor will move in one direction. Change to one gpio low, the other high to change direction. If both gpios are high or both gpios are low the motor will stop.

There are two pins for enableA and other two pins for enableB
as in the picture: http://i1.minus.com/ibch7xnAhDDkoT.jpg
You can see both enableA and enableB have two pins. both pair of them are jumpered

[joan]

Enable A is next to IN1. Enable B is next to IN4. The pin behind each enable pin is connected to 5V. The jumper connects 5V to the enable pin.

[mannok]

Enable A is next to IN1. Enable B is next to IN4. The pin behind each enable pin is connected to 5V. The jumper connects 5V to the enable pin.

SOLVED!!! thanks!!!!