Sven Arnold

Hacker, Linux, Python, Electronics, Robots

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This user joined on 10/02/2018.

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Luis wrote 11/09/2021 at 22:24 point


Thanks for your question.

Now, I'm just focused on brushed/coreless ones. They are cheaper, easier to find and the big companies (dinamixel, herkulex...) use only brushed. Also, the motor dimensions are standard along the board. Brushless are another beast itself.

The board should be able to manage high currents, but, I will make a tutorial to make your own cables, because it's much efficient to chain in the connector and avoid pass tens of amperes through the PCB. Another solution, used by dynamixel for example, is to connect with a cable the connectors internally to allow higher currents, super easy and cheap solution.

About the protocols, I think that RS485 is easier to handle, it is a lighter protocol, cheaper ICs, faster... I started with RS232 (you can check the blog of libreservo), but with the time and speaking with one engineering from lynxmotion, I decided to change to a more robust protocol. CAN was an option... but at the end I though that didn't contribute enough.

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Luis wrote 11/07/2021 at 09:14 point

Thanks Sven for liking LibreServo. If you have any questions or concerns about the project, just ask :)

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Sven Arnold wrote 11/09/2021 at 16:37 point

Hey Luis, have you thought about a version for servos with brushless motors for higher speeds? Ist there any issue with current draw if there are multiple servos daisy chained together and all are moving at the same time. I was thinking about creating my own servo controller for my autonomous cars and integrate CAN-FD as communication. Why do you choose RS485?

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