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Use LI-PO battery in 16ch servo driver
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Use LI-PO battery in 16ch servo driver

by aldoz on Thu Jan 31, 2019 2:36 pm

Hi all, I have a Adafruit 16ch servo driver and I am close to use my new battery pack instead my current power supply.
I am using 12 9kg-torque servos linked.

current power supply : 5v 40A

my new battery : 7,4V 2700 mAh

I would to use a voltage regulator to bring down the voltage to obtain 5V.
any recommendation to avoid troubles? :)
thank you in advance!
aldoz
 
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Re: Use LI-PO battery in 16ch servo driver

by adafruit_support_bill on Thu Jan 31, 2019 2:47 pm

Are you using the 5v for the servos, or are you powering something else with it? The max current requirements will decide what kind of regulator to use.

If your servos can handle, 7.4v, you can feed that direct to the the screw terminals.

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Re: Use LI-PO battery in 16ch servo driver

by aldoz on Thu Jan 31, 2019 2:58 pm

adafruit_support_bill wrote:Are you using the 5v for the servos, or are you powering something else with it? The max current requirements will decide what kind of regulator to use.

If your servos can handle, 7.4v, you can feed that direct to the the screw terminals.


My servos :
from 4,8V to 6V !
So i need to use the voltage regulator right?
aldoz
 
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Joined: Mon May 12, 2014 7:24 pm

Re: Use LI-PO battery in 16ch servo driver

by adafruit_support_bill on Thu Jan 31, 2019 3:31 pm

Yes. You should regulate down to 6v or less. Not sure what the current requirements for you servos are. But you will want to use a "buck" type converter such as a UBEC or other switching type DC/DC converter.

A UBEC ike this one can handle up to a 3A load. https://www.adafruit.com/product/1385
You can find DC/DC converters with higher current rating if needed from Amazon and other vendors.

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Re: Use LI-PO battery in 16ch servo driver

by aldoz on Thu Jan 31, 2019 4:58 pm

adafruit_support_bill wrote:Yes. You should regulate down to 6v or less. Not sure what the current requirements for you servos are. But you will want to use a "buck" type converter such as a UBEC or other switching type DC/DC converter.

A UBEC ike this one can handle up to a 3A load. https://www.adafruit.com/product/1385
You can find DC/DC converters with higher current rating if needed from Amazon and other vendors.


Ah, very interesting.
So i will regulate voltage of battery to 5V.
I develope that quadruped:
https://www.youtube.com/watch?v=bt_8X4lYDGY
weight : 2,5 kg
12 servos to mantain this weight.
I suppose in some moments I get 4 / 5 ampere to let this quadruped walk.

I don't understand exactly what this UBEC is.
Is that a voltage regulator?

Currently I need :
1 x voltage regulator to put my battery from 7,4V to 5V.
1 x UBEC ????
aldoz
 
Posts: 28
Joined: Mon May 12, 2014 7:24 pm

Re: Use LI-PO battery in 16ch servo driver

by adafruit_support_bill on Thu Jan 31, 2019 5:06 pm

The UBEC is a voltage regulator It is capable of up to 3A max. For your application with 12 servos, I would recommend 2 of them. One for the left side and one for the right.

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Re: Use LI-PO battery in 16ch servo driver

by aldoz on Thu Jan 31, 2019 5:58 pm

adafruit_support_bill wrote:The UBEC is a voltage regulator It is capable of up to 3A max. For your application with 12 servos, I would recommend 2 of them. One for the left side and one for the right.


Thank you!!
two of them or one capable of 6A!?
right?
aldoz
 
Posts: 28
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Re: Use LI-PO battery in 16ch servo driver

by adafruit_support_bill on Fri Feb 01, 2019 6:47 am

Yes. A 6A version should work for you also.

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Re: Use LI-PO battery in 16ch servo driver

by aldoz on Fri Feb 01, 2019 12:29 pm

adafruit_support_bill wrote:Yes. A 6A version should work for you also.


Thank you again :)
aldoz
 
Posts: 28
Joined: Mon May 12, 2014 7:24 pm

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