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Topic: 4.5V Motors (Read 777 times) previous topic - next topic

adruinouno111

Jun 20, 2013, 09:47 pm Last Edit: Jun 22, 2013, 01:37 am by adruinouno111 Reason: 1
I have the DAGU 4WD Robot Chassis and The ADAFRUIT Motor shield(Independent Power Supply (6V - 4AA). Im trying to get the motors power. I run the program which moves the motors but it doesent have alot of power. (If I touch the wheels they completely stop.)

Thank You!

CrossRoads

Got links to what you're using now?
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

adruinouno111

Yes, I got it from here

http://www.ebay.com/itm/4WD-4-Wheel-Drive-Two-Layer-DIY-Mobile-Robot-Platform-for-Arduino-Project-/130685832015?pt=LH_DefaultDomain_0&hash=item1e6d7b8b4f

Thank You

adruinouno111

Has Anyone Had The Same Problem? Would a 9.6V Battery Work Like This One

http://www.ebay.com/itm/New-RadioShack-23-331-R-C-Car-Ni-MH-Rechargeable-Battery-Pack-MAX-9-6V-1600mAh-/261232860699?pt=US_Radio_Control_Control_Line&hash=item3cd2b11e1b

I Attached Some More Pictures.






Thank You.

joemcder

While the NiMH pack is better, the 4 AA batteries should be OK.  Something else is wrong.  Are you using PWM?  Sooftware?

MarkT

The Adafruit shield uses L293's which waste about 2.5V internally.  These chips require a minimum of 7V on the motor supply
to function properly.  7V - 2.5V = 4.5V (which is the minimum motor voltage the motor shield claims to support).

So find yourself a decent 7.2 NiMH battery pack and all should be well if your motors are taking 0.6A or less
and you have good cooling for the motor shield (free air flow).

Personally I'd never recommend the L293 or L298 motor driver chips for low-voltage motors, they waste so
much power (and get so hot).
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

adruinouno111

Ok, Thank you! Would the 7.2V Battery Pack work with 4 Motors? That's how much this chassis needs.


Thank You Again!

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