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R/C servo Question
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

R/C servo Question

by Roger435 on Tue Apr 28, 2020 9:29 pm

Hi,

I don't know what sort of board/s you have in your inventory to enable this type of operation this is why I am asking.

I am in need of having an R/C servo rotate from zero to 30d in one direction and then back to zero then to a 30d in the opposite direction then back to zero. These operations would need a switch for each direction and the movement must be within a second. I would also need to be able to adjust the degree movement to the maximum of the 30d. This operation must be battery operated.

Does this sound like a product you have in your inventory?

Thanks,

Roger Greene

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Re: R/C servo Question

by adafruit_support_bill on Wed Apr 29, 2020 6:14 am

I am in need of having an R/C servo rotate from zero to 30d in one direction and then back to zero then to a 30d in the opposite direction then back to zero. These operations would need a switch for each direction and the movement must be within a second.

Most any microcontroller could handle that task with a bit of programming.
I would also need to be able to adjust the degree movement to the maximum of the 30d.

What kind of interface do you need for performing the adjustments? Graphical? A simple pot?
This operation must be battery operated.

There are many options there - both disposable and rechargeable. The choice of battery capacity will depend on the power requirements of your servo and your run-time.

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Re: R/C servo Question

by Roger435 on Wed Apr 29, 2020 6:35 pm

My project is controlling a model control line airplane so a small microcontroller board would be preferred because the plane will weigh about 30oz. A simple pot would be preferred for the degree adjustment. The battery should be rechargeable because the airplane is electric too. The movement of the servo in either direction needs to be two momentary switches, one for up degrees and the other down degrees. The 30dergrees in either direction was the max output. In reality probably only 20 degrees.

FYI info on the airplane:
The airplane is traveling in a circular path with the pilot in the center of the circle. The pilot is guiding the plane with a handle that has two cables attached. One cable is on the top of the handle and the other cable is on the bottom of the handle. The handle is 4 inches. The cables attach in the plane to a 4-inch bellcrank. The cables are not conducting electricity. The distance from the pilot to the plane is 60 feet.

Thanks,

Roger

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Re: R/C servo Question

by adafruit_support_bill on Thu Apr 30, 2020 6:12 am

Cool. I haven't flown U-control since my high-school days.

This sounds like a job for a Feather. Feather boards are small and lightweight. The Feather M0 Basic Proto has a little prototyping area on the end of the board where you could mount your adjustment pots. It also has a built-in LiPo charger and can be powered by any of our LiPo cells. You probably don't need huge capacity since flight-times are typically fairly short. But do pay attention to the current requirements of your servo and make sure to select a cell that can handle the required drain-rate.
https://www.adafruit.com/product/2772
https://www.adafruit.com/category/574

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Re: R/C servo Question

by Roger435 on Thu Apr 30, 2020 7:58 pm

Will instructions come with the Feather MO Basic Proto? I haven't been in electronics since the mid-sixties. Can I get all the items from your site? What servo do you recommend? Will, that servo return to neutral quickly after quickly needed?

The flight time is about 7 minutes. I will be using your Trinket MO for the timer.

Thanks for all your information.

Roger

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Re: R/C servo Question

by adafruit_support_bill on Fri May 01, 2020 6:09 am

The servo control pulses would be coming from the Feather M0. But I'm not sure how the Feather would know what to do.

My recollection of control-line flight (from the early 70's) didn't have any electronics or servos. There was just the elevator control via bellcrank attached to the control cables. Are you replacing the bellcrank linkage with switches and a servo?

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Re: R/C servo Question

by Roger435 on Fri May 01, 2020 5:32 pm

My internet is to have the bell crank to operate the elevator normally. The flaps will operate using the servo pulses when needed to make the airplane turn quickly. When the elevator reaches a certain degree in either direction the flaps will work and thus making the airplane turn quicker. Well, that's the plan anyway.

If you don't try your dream you will never know if it was possible!

Thanks,

Roger

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Re: R/C servo Question

by adafruit_support_bill on Sat May 02, 2020 6:38 am

Documentation for the Feather can be found here: https://learn.adafruit.com/adafruit-fea ... o/overview

We do carry a small selection of servos. A micro servo like the TowerPro SG92R would probably do the job for a small plane. https://www.adafruit.com/product/169
Although similar sized units from HiTec or Futaba tend to operate more smoothly and reliably than the lower-priced TowerPros.

ServoDatabase is a good reference for comparing servo specifications. They list torque and speed at different operating voltages. Note that the speed measurement is for an unloaded servo. You can expect it to be somewhat slower under load.
https://servodatabase.com/

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Re: R/C servo Question

by Roger435 on Sun May 10, 2020 4:24 pm

Will the feather M0 work with 'DEVMO 433MHz Ask Wireless Remote Control Transmitter and Receiver Module Kit STX882+SRX882' and 'Diymore 6DOF MPU-6050 GY-521 MPU6050 3 Axis Gyroscope + Accelerometer Module for Arduino MPU 6050'?

I have a function I want to try while the airplane is flying. The function to record a maneuver that I make the plane do then have the feather M0 repeat the maneuver.

Is this possible or do I need another board?

Thanks
Roger

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Re: R/C servo Question

by adafruit_support_bill on Mon May 11, 2020 5:19 am

We make an MPU6050 board that does work with all the Feathers:
https://www.adafruit.com/product/3886
https://learn.adafruit.com/mpu6050-6-do ... o?view=all

I'm not familiar with the remote control modules you mention. If the manufacturer can provide you with Arduino compatible libraries, they should work with the Feather as well.

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Re: R/C servo Question

by Roger435 on Mon May 25, 2020 6:09 pm

I have a function I want to try while the airplane is flying. The function to record a maneuver that I make the plane do then have the feather M0 repeat the maneuver.

Is this possible or do I need another board?

Thanks
Roger

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Re: R/C servo Question

by adafruit_support_bill on Mon May 25, 2020 6:44 pm

I don't think you need another board. the MPU6050 should be sufficient to measure the maneuver . But the software to reproduce it may not be trivial.

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Re: R/C servo Question

by Roger435 on Wed May 27, 2020 4:20 pm

Do you have another Feather MO board that will do for me? Because the Adafruit Feather M0 Basic Proto - ATSAMD21 Cortex M0
PRODUCT ID: 2772 is out of stock

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Re: R/C servo Question

by adafruit_support_bill on Wed May 27, 2020 4:40 pm

The Feather M0 Express is in stock currently. It sacrifices a bit of the prototyping area for some extra memory so it can run Python. Other than that, it is the same as the M0 Basic Proto. https://www.adafruit.com/product/3403

We also have the M4 Express - with a faster and more powerful processor: https://www.adafruit.com/product/3857

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Re: R/C servo Question

by Roger435 on Wed Jun 03, 2020 10:04 pm

What basic programing book do you recommend for running the Feather MO board? I have programmed in AutoCAD lisp and a long long time ago in Atri basic.

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Please be positive and constructive with your questions and comments.