Author Topic: PWM Signal Generator in reverse polarity mode  (Read 439 times)

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Offline VanillaIceCream

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PWM Signal Generator in reverse polarity mode
« on: July 11, 2021, 10:35:35 am »
Can I switch the output ports of this PWM motor driver module to get out a negative PWM signal for my motor without destroying anything in the module?
I found no info about it on the sellers page.


PWM Module:

https://www.amazon.com/dp/B07XR9B1RN/ref=cm_cr_arp_d_product_top?ie=UTF8&language=en_US
 

Offline Benta

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Re: PWM Signal Generator in reverse polarity mode
« Reply #1 on: July 11, 2021, 06:21:03 pm »
I've no idea what you mean.
0...100% can be reversed to 100...0% PWM for a "negative pulse" PWM, if that's what you need.
 

Offline jpanhalt

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Re: PWM Signal Generator in reverse polarity mode
« Reply #2 on: July 11, 2021, 06:51:45 pm »
In addition, it may depend on whether the motor case/frame is "ground."  In other words, motor ground and your PWM source share a ground.
 

Online ledtester

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Re: PWM Signal Generator in reverse polarity mode
« Reply #3 on: July 11, 2021, 06:56:27 pm »
Do you mean you want to create a PWM signal between 0 and -5V instead of between 0 and 5V?

Then you might try this which doesn't require a negative rail:

https://electronics.stackexchange.com/a/221425/95488

The output won't be able to provide a lot of current, but into a high impedance input it should work.


 
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Offline VanillaIceCream

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Re: PWM Signal Generator in reverse polarity mode
« Reply #4 on: July 15, 2021, 03:59:15 pm »
Do you mean you want to create a PWM signal between 0 and -5V instead of between 0 and 5V?

Then you might try this which doesn't require a negative rail:

https://electronics.stackexchange.com/a/221425/95488

The output won't be able to provide a lot of current, but into a high impedance input it should work.



Yes exactly, thanks.
« Last Edit: July 22, 2021, 01:30:46 am by VanillaIceCream »
 


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