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Author Topic: Halloween Hex  (Read 15706 times)

ptp

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Re: Halloween Hex
« Reply #15 on: June 21, 2016, 05:45:40 PM »
Duane,

Sorry to insist, but it seems some other post came after mine...

What kind of battery do you use. If i power mine with 2S cells, do you think the servos can accept 7.4v without risk of damage ?

Thanks.

Duane Degn

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Re: Halloween Hex
« Reply #16 on: June 21, 2016, 06:11:46 PM »
Duane,

Sorry to insist, but it seems some other post came after mine...

What kind of battery do you use. If i power mine with 2S cells, do you think the servos can accept 7.4v without risk of damage ?

Thanks.

Sorry, I missed your earlier question.

Using a 2S LiPo is very risky. There are some servos which claim they work with 2S batteries but I haven't found any which work well. The small HobbyKing HXT500 servos will go up in smoke when powered with a 2S LiPo. The other servos I tried didn't go up in smoke but the servo didn't work well at the higher voltage.

Gordon McComb (author of Robot Builder's Bonanza) suggested the servos I used on this hex could be used with a 2S LiPo so I tried it. The servos didn't go up in smoke but many of the servos wouldn't stay still. They constantly shook back and forth.

It would be nice to find an inexpensive servo which reliably worked on a 2S LiPo but I haven't found them yet myself.

I don't purchase servos off ebay. I've had too many bad experience. I think HobbyKing's servos are pretty good for the price.

MEgg

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Re: Halloween Hex
« Reply #17 on: June 22, 2016, 07:11:19 PM »
Duane,

Sorry to insist, but it seems some other post came after mine...

What kind of battery do you use. If i power mine with 2S cells, do you think the servos can accept 7.4v without risk of damage ?

Thanks.

The Spider card might be good for this:
http://www.dagurobot.com/goods.php?id=134
I use it for my robot.
1st project: Dagu 5 Rover + Dagu - 4 Channel DC Motor + Red Back Spider robot controller + Raspberry B+
Chassis + wheels: https://picload.org/image/dggroior/20150831_028.jpg
current: https://www.keepandshare.com/userpics/m/a/r/k/usegg/2016-04/sb/img_3480-79682018.jpg

Duane Degn

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Re: Halloween Hex
« Reply #18 on: June 24, 2016, 05:15:57 PM »
The Spider card might be good for this:
http://www.dagurobot.com/goods.php?id=134
I use it for my robot.

I think the Spider board is a good choice for a lot of robots but I don't think the 3A regulator could safely power 18 servos in a hexapod as large as the Halloween Hex. I think it's likely the two 10A (20A total) regulators I'm using is overkill but I also think 3A is not nearly enough current for a hexapod this size. I haven't tried it myself but it may be possible to power this size of hex with a single 10A regulator.

MEgg

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Re: Halloween Hex
« Reply #19 on: June 25, 2016, 01:13:21 PM »
The Spider card might be good for this:
http://www.dagurobot.com/goods.php?id=134
I use it for my robot.

I think the Spider board is a good choice for a lot of robots but I don't think the 3A regulator could safely power 18 servos in a hexapod as large as the Halloween Hex. I think it's likely the two 10A (20A total) regulators I'm using is overkill but I also think 3A is not nearly enough current for a hexapod this size. I haven't tried it myself but it may be possible to power this size of hex with a single 10A regulator.

I did not look up power consumption of these servos, actually I did not find a data sheet on the net.
1st project: Dagu 5 Rover + Dagu - 4 Channel DC Motor + Red Back Spider robot controller + Raspberry B+
Chassis + wheels: https://picload.org/image/dggroior/20150831_028.jpg
current: https://www.keepandshare.com/userpics/m/a/r/k/usegg/2016-04/sb/img_3480-79682018.jpg

 

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