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Topic: powering two dc motors and two servo motors  (Read 1 time)previous topic - next topic

jessabu

Mar 12, 2018, 03:40 am
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

#1
Mar 12, 2018, 05:49 am
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

#2
Mar 13, 2018, 02:21 am
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 amLast 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

#4
Mar 13, 2018, 12:16 pm
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.
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

jessabu

#5
Mar 13, 2018, 01:15 pm
Is 4A enough for the DC motors also?

MarkT

#6
Mar 13, 2018, 02:45 pm
Perhaps you should reread what I said, it seems very clear to me.
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jessabu

#7
Mar 15, 2018, 03:57 am
Oh, again, sorry for the misunderstanding. Would 6 AA (1.5v each) batteries in a battery pack also work?

MarkT

#8
Mar 15, 2018, 12:09 pm
Oh, again, sorry for the misunderstanding. Would 6 AA (1.5v each) batteries in a battery pack also work?
quality D-cells.  4, not 6, D-cells, not A-cells, quality, not rubbish unbranded, rechargable, not alkaline.

Clear enough now?
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

jessabu

#9
Mar 16, 2018, 02:56 am
Okay. Thank you for all of the help. It's very much appreciated

jessabu

#10
Mar 16, 2018, 04:13 am
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

#11
Mar 16, 2018, 12:24 pm
Neither, the batteries are for the servos and motors only.
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

jessabu

#12
Mar 26, 2018, 03:04 am
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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