Controlling two servos with BLE

RE: Controlling two servos with BLE

avijay — Wed, 04 Dec 2024 14:42:06 GMT

Hi Vidar, I solved it yesterday, I wasnt applying the period definitions, which led to it not working correctly. Very silly mistake overall. Thank you for the assistance!

RE: Controlling two servos with BLE

Vidar Berg — Wed, 04 Dec 2024 12:34:55 GMT

I need a bit more information to determine what the problem could be, like what you’ve tried and what failed specifically (did you get build or runtime error?). The process of duplicating a characteristic should be the same regardless of whether it is used for controlling an LED or a servo motor.

RE: Controlling two servos with BLE

avijay — Tue, 03 Dec 2024 13:46:10 GMT

I have previously gone through, and made edits to my code, however for this, it has not been applying or working. I had no trouble duplicating LEDs, but for servo control, it was not working. Do you know if I have to approach Servo control differently?

RE: Controlling two servos with BLE

Vidar Berg — Tue, 03 Dec 2024 13:28:25 GMT

If you haven't already, I would recommend you go through this Devacademy course at https://academy.nordicsemi.com/courses/bluetooth-low-energy-fundamentals/lessons/lesson-4-bluetooth-le-data-exchange/topic/blefund-lesson-4-exercise-1/. It covers this topic and explains how to implement a custom service. You can duplicate the characteristic in your service declaration and assign it a different UUID.

RE: Controlling two servos with BLE

avijay — Tue, 03 Dec 2024 13:20:01 GMT

Hi Vidar, thanks for getting back to me! How do I create the second BLE characteristic, Ive been having trouble with it. All I want to do is literally have the same exact thing that the existing servo motor does, done by another motor with another characteristic.

RE: Controlling two servos with BLE

Vidar Berg — Tue, 03 Dec 2024 08:36:52 GMT

Hi,

The simplest approach might be to modify the BLE command used to control the servo to include an ID for the specific servo you want to control. For example, you could create a 2-byte command with the following format: <servo ID> <command>. Another alternative is to create a second BLE characteristic to control the other servo.

Best regards,

Vidar