Author Topic: Need help- 24vdc motor driver  (Read 255 times)

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Offline mr_rendellTopic starter

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Need help- 24vdc motor driver
« on: June 18, 2014, 06:59:06 PM »
Hello,
First of all thanks for allowing me join this group.
I need help figuring out electronics on my lawnbot,
I am using:
2ea wheelchair motors
2ea 12vdc 35ah batteries
Lawn mower (of course)
Super e t4 fhss digital proportional radio system (4ch)
And... 2 ea (china made) ebay
DC 15-24V 40A Brush Motor Driver Module Drive Board 80A Max
(Was gonna get sabertooth 2x25) but a bit pricy

Now..
I am not sure if I need arduino to control my motor driver board or use it just like sabertooth
When I try to plug it with my batt and receiver, I was only getting 9vdc on the motor poles.
Has anyone use this motor driver?
Thanks in advnce!

Offline jkerns

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Re: Need help- 24vdc motor driver
« Reply #1 on: June 19, 2014, 07:13:48 AM »
It appears from the picture that the input to your motor driver is a PWM from 0 to 98% duty cycle. (on 0% to 98% of the time)

The "Standard" output from the typical RC system is a pulse modulated system that does not provide the above type of duty cycle. (don't recall the details off the top of my head, google it.)

So, unless you can make your radio output a duty cycle instead of the standard servo pulse signal, you will need something to translate from RC style signals to a duty cycle.
I get paid to play with robots - can't beat that with a stick.

http://www.ltu.edu/engineering/mechanical/bachelor-science-robotics-engineering.asp

 


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