wiser
Posts: 7
Joined: Thu Aug 22, 2019 3:21 am

Motor controller board

Fri Aug 23, 2019 3:59 am

My L298n motor controller board that goes with a raspberry pi isn't lighting up even though it is connected to a power source (4 AA batteries). Does anyone have any solutions to this?

jondallimore
Posts: 199
Joined: Thu Aug 04, 2016 11:02 pm

Re: Motor controller board

Fri Aug 23, 2019 12:26 pm

check power leads, check solder joints, check batteries with a multimeter

theres so many things it could be...

pcmanbob
Posts: 6652
Joined: Fri May 31, 2013 9:28 pm
Location: Mansfield UK

Re: Motor controller board

Fri Aug 23, 2019 6:43 pm

Hi.

You really need 7 volts on the battery input before the on board voltage regulator will function, these L298N boards are really designed to operate with a 12v battery.
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wiser
Posts: 7
Joined: Thu Aug 22, 2019 3:21 am

Re: Motor controller board

Fri Aug 23, 2019 11:51 pm

I did check my solder joints and power leads. Will 4 AA batteries be enough for this board?

pcmanbob
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Location: Mansfield UK

Re: Motor controller board

Sat Aug 24, 2019 10:12 am

wiser wrote:
Fri Aug 23, 2019 11:51 pm
I did check my solder joints and power leads. Will 4 AA batteries be enough for this board?
4 X 1.5V = 6v No load, so under load when the motors are running the voltage will probably be nearer 4-5v so the on board voltage regulator will just about work at 6v but will stop functioning at 4v.

As I said these L298N boards are design to operate with a 12v motor supply, at lower voltages the volt drop across the controller chip will consume much of your battery voltage , which will lead to your motors being slow or not functioning.
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wiser
Posts: 7
Joined: Thu Aug 22, 2019 3:21 am

Re: Motor controller board

Sat Aug 24, 2019 6:09 pm

Will a raspberry pi and 4 AA batteries together be enough to light the motor controller board up?

pcmanbob
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Location: Mansfield UK

Re: Motor controller board

Sat Aug 24, 2019 6:24 pm

wiser wrote:
Sat Aug 24, 2019 6:09 pm
Will a raspberry pi and 4 AA batteries together be enough to light the motor controller board up?
What's up don't you like my answer above ?

Asking the question again won't change the answer.
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jondallimore
Posts: 199
Joined: Thu Aug 04, 2016 11:02 pm

Re: Motor controller board

Sat Aug 24, 2019 10:38 pm

wiser wrote: ↑
Sat Aug 24, 2019 6:09 pm
Will a raspberry pi and 4 AA batteries together be enough to light the motor controller board up?
You've already tried with 4 AA batteries. I would use at least 8 AA's, but preferably a li-po battery from an rc car (12v again).
Or the board could be fried.

wiser
Posts: 7
Joined: Thu Aug 22, 2019 3:21 am

Re: Motor controller board

Sun Aug 25, 2019 2:26 am

Ok

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