3volt pwm turn on by itself!

Thread Starter

KevenR

Joined Dec 30, 2018
1
Hi!
Sorry for my bad english... i will try to make it easy.
I have buy some of this pwm 10Pcs DC 3V To DC 35V 5A 90W Mini DC Motor PWM Speed Controller Module Speed Regulator Adjustable Light Modulator Electronic Switch Module Board. I plug it with 4,5v on arduino motor and if I put the pot to off position, after a few hours, the power comes up by itself! If i turn the pot to on position, i can regulate power but when i turn to off, the power goes to full throttle. But the small led supposed to be light on when i power is on, came little bright when is in off position and motor turn. I have remove completely the switch (pot) from the board and it always power on! But all this became after +24 hours i put the battery on it!
Anyone have an idea?
Thanks.
 
Last edited by a moderator:

danadak

Joined Mar 10, 2018
4,057
When pot turned to off position could be it does not ground the
signal properly, eg. it has poor contact with its end stops for the
pot wiper. If you have ohmmeter you could measure from wiper
to ground to see if it looks like a good ground.

If you do not have ohmmeter possibly use a contact cleaner on the
pot.

An alternative is to add a R to ground to pot wiper, use a value 10X
the resistance of the pot so as to not alter significantly the functionality
and voltages delivered by the pot wiper.

Chinese pots are pretty awful, my experience, in their quality.


Regards, Dana.
 
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