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What to buy: Need a simple 180 turning servo
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What to buy: Need a simple 180 turning servo

by SoundwaveSuperior on Fri Oct 15, 2021 10:30 pm

Hi all,
Noob here. So what I want to build is the Squid Game Red Light Green Light Doll Robot head. I just need a simple high torque servo that can turn the head 180 degrees when I press the cricket button. It needs to be in a costume so it must be battery powered. I am thinking of purchasing: Microservo MG90D high torque, ADA fruit cricket, and the 3 AA battery holder. Is there anything else I need to purchase for this simple mechanism? Please help!
-SoundwaveSuperior

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Re: What to buy: Need a simple 180 turning servo

by franklin97355 on Fri Oct 15, 2021 10:41 pm

Before you build the item test the servo to make sure it will do what you want, Some servos are not able to sweep a full 180 degrees. you can use a microcontroller like the Trinket M0 if the space is an issue. Take a look at https://learn.adafruit.com/trinket-gemma-servo-control

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Re: What to buy: Need a simple 180 turning servo

by SoundwaveSuperior on Sat Oct 16, 2021 12:03 am

Thank you for your reply. Do you think this metal gear 180 degree servo would work properly? I just need to press a button for the servo to turn 180 degrees in one direction and then press it again to go back to the original position. That's all it needs to do.

https://youtu.be/nY7D_5_Qmps

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Re: What to buy: Need a simple 180 turning servo

by franklin97355 on Sat Oct 16, 2021 1:54 am

Our servos should be comparable.

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Re: What to buy: Need a simple 180 turning servo

by SoundwaveSuperior on Sat Oct 16, 2021 2:08 am

Is there one in particular that I should purchase? I would like one that has metal gears for high torque.

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Re: What to buy: Need a simple 180 turning servo

by adafruit_support_bill on Sat Oct 16, 2021 6:46 am

Is there one in particular that I should purchase? I would like one that has metal gears for high torque.


How much torque do you need?

"high torque" is a relative term and not necessarily related to the material that the gears are made of. The "High Torque" MG90 has about half the stall torque of the 'Standard' SG5010 which has a plastic gear train. Torque specs are listed for all the servos in the store.

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Re: What to buy: Need a simple 180 turning servo

by SoundwaveSuperior on Sat Oct 16, 2021 10:27 am

Hmm it needs to be able to move a 5 lb object 180 degrees with minimal friction without breaking the gears.

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Re: What to buy: Need a simple 180 turning servo

by adafruit_support_bill on Sat Oct 16, 2021 10:49 am

Weight is only part of the equation. To calculate torque, you would need to know how that weight is distributed and how fast you intend to be moving it.

The other thing to consider is how your load is going to be supported. If it is going to be mounted directly to the servo shaft, then you will need a servo with a shaft and bearings capable of supporting the load. A 5 pound load is a lot to attach to the shaft of a micro servo - especially if it will be on a wearable project.

Something like the MG995R is probably a better choice.: https://www.adafruit.com/product/1142

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Re: What to buy: Need a simple 180 turning servo

by SoundwaveSuperior on Sat Oct 16, 2021 10:57 am

Yes the 5 lb load mask will be directly loaded onto the Microservo. I will try to make is equally heavy on all areas by balancing materials. The rotation would be 180 degrees in 5 seconds so not that fast. The servo you recommended seems strong but only rotates max 170 degrees. Do you have an alternative for the weight but also goes 180 degrees? Btw thank you for the quick replies!

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Re: What to buy: Need a simple 180 turning servo

by adafruit_support_bill on Sat Oct 16, 2021 11:52 am

I use these a lot: https://www.servocity.com/hs-645mg-servo/
Similar in torque to the MG995R. They have an all metal gear-train and the output shaft is supported by dual ball bearings.

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Re: What to buy: Need a simple 180 turning servo

by SoundwaveSuperior on Sat Oct 16, 2021 12:07 pm

So with this servo and the circuit playground express I can program it in Make code to press button A to go to 180 degrees and when I press button B to go to 0 degrees? Just like in this video?
BTW this video was how I found you guys!

https://youtu.be/cofElsolYk4

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Re: What to buy: Need a simple 180 turning servo

by SoundwaveSuperior on Sat Oct 16, 2021 12:11 pm

Also how about the MG92B. It has metal gears, goes 180 degrees? Unsure if it's to weak for what I need.

https://www.adafruit.com/product/2307

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Re: What to buy: Need a simple 180 turning servo

by adafruit_support_bill on Sat Oct 16, 2021 1:08 pm

It has less than half the torque of the HS-645MG.

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Re: What to buy: Need a simple 180 turning servo

by SoundwaveSuperior on Sat Oct 16, 2021 2:03 pm

Ok I think I'm going to buy the HS-645MG. It says that it has an average radio system of 90*. It says that with either a travel tuner or a wide signal controller it can increase it to 197*. Does the circuit playground express act as a wide signal controller to increase it or do I need to purchase a travel tuner?

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Re: What to buy: Need a simple 180 turning servo

by adafruit_support_bill on Sat Oct 16, 2021 2:15 pm

The circuit playground can generate control signals to turn it a full 180 degrees.

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