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Control a brush motor with DFRobot motor shield?


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#1 netdontknow

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Posted 11 September 2011 - 10:25 PM

Hello All, I am interested to see if I can control a brush motor like a traxxas Titan 12T with a DF Robot motor shield like L293B WITHOUT the use of an ESC. I spent alot of time trying to control it thru an ESC, (yes I did try Chris's driver). But it is rediculous how it works. From what I see It either starts out fast or standing idle. I couldn't really control the speed the way I wanted...like I could with a motor shield+ dc motor. The driver says I can do: for(int i=0; i<=100; i++){ xl5.Throttle = i; Thread.Sleep(100); } The fact the matter is this driver didn't work right. If you set throttle to anything below 90, it has NO affect to the motor, so basically from i = 0-90, the motor sits still until it got 90+, then it runs fast like hell. so there is no point there, we can just do this xl5.Throttle = 100; Sleep (forever) not to mention other issues like sometimes the motor is supposed to be stopped but then it runs again. I need to be able to have it drives really slow as any speed just like i could with DC step motor. Anyway I can achive this? -Thanks in advance!

#2 Hai Nguyen

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Posted 12 September 2011 - 04:02 AM

my guess the answer is yes and no...you should be able to get rid of the ESC, and control the motor via that L293B motor shield, that is what the shield is for anyway.... however you are going to have to replace that Titan 12T with something else, this motor draws around 20-25amps of power while the according to L293B only output 1Amp, so you dont want to BBQ the shield. I assume you drive the gearbox with one motor? so consider replace that motor with something less powerful (around 1amp). at the sametime it has energy to drive the gearbox. something like this one maybe, (specs from ebay) •Model RS-385-SH-2270 •Operates on 12 VDC nominal •Operating voltage range: 6VDC to 24VDC •No load speed at 12 VDC is 10,000 RPM •No load current is 200 mA •Full load (maximum efficiency @ 12VDC) performance characteristics: ◦Speed: 8,170 RPM ◦Current: 890 mA ◦Torque: 80.5 g-cm (7.89 mN-m) ◦Power output: 6.74 Watts •Stall torque: 440 g-cm (43.2 mN-m) •Stall current: 4.00 A

#3 Chris Seto

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Posted 13 September 2011 - 01:18 AM

The driver works perfectly, however you need to calibrate your XL5 to the proper timing settings. EDIT: Also, you cannot use that shield for that motor. You need a proper ESC. BTW: Fancy seeing you here, Hai, I wondered what happened to you. :)

#4 Hai Nguyen

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Posted 15 September 2011 - 06:15 AM

The driver works perfectly, however you need to calibrate your XL5 to the proper timing settings.

EDIT: Also, you cannot use that shield for that motor. You need a proper ESC.

BTW: Fancy seeing you here, Hai, I wondered what happened to you. :)



#5 Hai Nguyen

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Posted 15 September 2011 - 06:17 AM

Hehe still here Chris just busy and lazy lately, you know what happen to just married people:-) will work something out soon




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