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Topic: powering two dc motors and two servo motors  (Read 633 times) previous topic - next topic

jessabu

Hello. I'm trying to figure out how to power two servos and two dc motors for a robot project I'm doing. The servos are supposed to control long pieces of cardboard connected to some type of shovel in order to pick up trash. The dc motors are used for the movement of the robot. I read another forum post about powering the motors but I wasn't understanding something. My question is, can I power the motors with 6v, 4 AA batteries, or so I have to power them all with 12v? I appreciate any help given, thank you very much.

Paul_KD7HB

Hello. I'm trying to figure out how to power two servos and two dc motors for a robot project I'm doing. The servos are supposed to control long pieces of cardboard connected to some type of shovel in order to pick up trash. The dc motors are used for the movement of the robot. I read another forum post about powering the motors but I wasn't understanding something. My question is, can I power the motors with 6v, 4 AA batteries, or so I have to power them all with 12v? I appreciate any help given, thank you very much.
To begin any help, we need to know the current and voltage ratings of the servos and motors, and especially the starting current needed by the motors.

Paul

jessabu

Oh, I'm sorry about that. The servos are 4.8V-6V, and the DC motors are 3V to 6V. I'm not sure what you mean by starting current.

jremington

#3
Mar 13, 2018, 03:10 am Last Edit: Mar 13, 2018, 03:11 am by jremington
The starting current, or the "stall current" in the data sheets, is the supply voltage divided by the motor winding resistance.

4xAA will power two standard hobby servos, but not more.

MarkT

You need to budget 1A per small servo, and probably about the same per small motor (although measuring
is better than guessing).  4 x D cell quality rechargables might be about right here, anything less isn't
going to handle 4A.
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jessabu


MarkT

Perhaps you should reread what I said, it seems very clear to me.
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jessabu

Oh, again, sorry for the misunderstanding. Would 6 AA (1.5v each) batteries in a battery pack also work?

MarkT

Oh, again, sorry for the misunderstanding. Would 6 AA (1.5v each) batteries in a battery pack also work?
As I said, reread my answer, it hasn't changed and it addresses your power requirements very clearly.  4
quality D-cells.  4, not 6, D-cells, not A-cells, quality, not rubbish unbranded, rechargable, not alkaline.

Clear enough now?
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jessabu

Okay. Thank you for all of the help. It's very much appreciated  :)

jessabu

I'm sorry. I have another question. If I use the rechargeable batteries, how would I connect them to the Arduino/robot? Through a power jack, or through a breadboard?

MarkT

Neither, the batteries are for the servos and motors only.
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jessabu

Okay, I purchased 4 D cell batteries over the weekend, but I'm still not understanding how I would connect the motors and batteries together. How would I connect them if not by breadboard or by the Arduino? Sorry to seem redundant, but I really don't understand.

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