Why with the exception of pin 3? While I can't recall using pin 3 for PWM why can't it be used? I'm curious on that note.

Ron

You CAN use pin 3, but it has another commonly used assignment. Unless you’re absolutely confident in what you’re doing, it’s best to avoid pin 3.

Let’s say you’re debugging a sketch. Most Arduino models don’t have built-in debugging. So you add debug code to serial print intermediate values and statito the IDE console. You’ve created a difficult to find coding error. Because the IDE console is written to using pin 3. Or if your sketch uses the USB interface, you’ve crashed your sketch. Because the Arduino uses pin 3 for USB communication.

Hence, I routinely recommend that unless absolutely necessary and you know what you’re doing, that you avoid using pin 3 for PWM.

Update: fixed typos.

 

Thanks for sharing that.

Ron

 

I am thinking of using this driver for Forward/Reverse. 2 Motors each with about 6A Rating. Any thoughts/suggestions?

New Dual Motor Driver Module board H-bridge DC MOSFET IRF3205 3-36V 10A Peak 30A | eBay

 

It should do the job as long as it lives up to its spec.

 

I had a similar requirement where, at short notice, I had to drive a small 12V motor using an arduino. I used an IRFZ44 MOSFET, with its gate switched by a transistor. I had a small 5V DPDT relay with 2 Amp contacts laying around so I used it, driven by a transistor, to reverse the motor. If you use a relay, make sure the motor has stopped before you switch the relay or the back EMF will weld or burn off the contacts.
View attachment 252966

Wonder how to interface this with the 2 DAFURUI motor drivers for the 2 motors?

 

Obtain the PDF for the board before you purchase it and review its capabilities!

 

Hello,

What model of the driver board do you have?
An image search gives many:
https://www.google.com/search?q=DAF...0AhVHnKQKHSTDBdcQvgV6BAgBEDE&biw=1270&bih=541

Bertus

 

DaFuRui 8Pack DC 5V-36V 15A(Max 30A) 400W MOS Transistor Driving Controller Dual High-Power 0-20KHz FET PWM Trigger Switch Driver Module Adjustable Switch Control Board Motor Speed Lamp Brightness

 

Hello,

Is this the one?
https://www.ebay.com/itm/154299394022
Those are single mosfet switches.


Bertus

 

Wonder how to interface this with the 2 DAFURUI motor drivers for the 2 motors?

Connect the outputs the the contacts of two DPDT relays to reverse the motors. Switch the reversing relays by the microcontroller as I have shown in the diagram.

 

Hello,

Is this the one?
https://www.ebay.com/itm/154299394022
Those are single mosfet switches.
View attachment 253067

Bertus

Yes, the one.

 

Still looking for something like the L298 which drives 2 motors F, R, but with a rating of 10 A FOR EACH MOTOR. Using a separate relay as suggested may be an option but preferable is to find a motor driver controlled by the PWM output of the UNO, which can drive 2 motors X 10 A.

 

Still looking for something like the L298 which drives 2 motors F, R, but with a rating of 10 A FOR EACH MOTOR. Using a separate relay as suggested may be an option but preferable is to find a motor driver controlled by the PWM output of the UNO, which can drive 2 motors X 10 A.

All you had to do was to look on-line:
https://www.amazon.com/Driver-Module-H-bridge-MOSFET-IRF3205/dp/B07V7BBLLT

 

All you had to do was to look on-line:
https://www.amazon.com/Driver-Module-H-bridge-MOSFET-IRF3205/dp/B07V7BBLLT

Thanks. I had seen this but thought I saw unavailable so skipped. It does say PWM but just want to be sure that it is Arduino compatible.

 

Thanks. I had seen this but thought I saw unavailable so skipped. It does say PWM but just want to be sure that it is Arduino compatible.

Sorry for the delay, but is this suitable for control by arduino uno?

 

Sorry for the delay, but is this suitable for control by arduino uno?

Yes.

Ron

 

I had a similar requirement where, at short notice, I had to drive a small 12V motor using an arduino. I used an IRFZ44 MOSFET, with its gate switched by a transistor. I had a small 5V DPDT relay with 2 Amp contacts laying around so I used it, driven by a transistor, to reverse the motor. If you use a relay, make sure the motor has stopped before you switch the relay or the back EMF will weld or burn off the contacts.
View attachment 252966

Only problem here is that my 2 motors are each 1.6A noload and 25 A STALL. May need a bigger relay/components possibly?

 

You will need a relay with a higher current rating but the stall current will not be a problem if you always use a soft start. To do that, the motor is started at the lowest speed possible and then it is gradually ramped up.

 

Thanks. I saw this in Amazon: https://www.amazon.ca/s?k=relay+5+v+coil,+12v+dpdt+contacts
It is OONO 3. Wonder if OK.

 

You will need a DPDT relay for each motor. The contact DC current rating should be a bit higher than the current that the motors will draw under maximum load for your application.