Controlling BLDC motor with VESC 4.12 and raspberry pi

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Mon, 2021-11-01 05:36

sanketh1691

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Controlling BLDC motor with VESC 4.12 and raspberry pi

Hello,

I am curently trying to control the BLDC motor of Traxxas X-maxx robo car with VESC 4.12 and raspberry pi, I tried giving PWM signals to the motor with python code in raspberry pi, I was not able to get the motor running but when I tried to run it with VESC tool without pi, then it worked but when I trying with pi and VESC together, I am not able to get it running. And I am giving power with 2 4S1P LiPo (6700 mAh, 14,8v). Can anyone help me with this as to what I should do here with PWM signals or should I send input through another way with pi?

Thank you,

Sanketh

Mon, 2021-11-01 07:47

frank

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First be careful with GND loops. If you power the PI from a different source, other than the 5V out of the ESC, you will create a ground loop! So you would need to use electronic decoupling (e.g.opto decoupler) in between the Pi and the ESC. Then you can check the input signal in VESC-Tool and see if your signal actually arrives and if it is well calibrated. You would then run the Input Wizard to configure and calibrate the input signal.

Mon, 2021-11-01 17:45

sanketh1691

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Hello frank,

Thank you for the response. So without a decoupler, I should first try with 5v output from ESC to power the raspberry pi is it? And I am not using any input source like radio controller, I am giving the input hardcoded through python script in pi. And can you tell me where in VESC tool do I see the input signal if we give them directly from pi to VESC? so that I can see if te signal is properly received.

Thank you,

Sanketh

Wed, 2021-11-03 20:30

(Reply to #3) #4

sanketh1691

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Hello,

Can yu tell me what is the frequency that VESC 4.12 will receive the PWM signals from pi or arduino?

Thank you,

Sanketh

Sat, 2021-11-06 10:07

skyline1970

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lpf should be used for pwm2dac operation

https://programmerclick.com/images/905/e4805ee05344b5342887410f30b94c21.gif

https://programmerclick.com/article/52401477063/

http://www.kerrywong.com/blog/wp-content/uploads/2013/10/IsolatedDAC.png

http://www.kerrywong.com/2013/10/01/an-isolated-dac-using-pwm-output

Mon, 2021-11-08 08:27

sanketh1691

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Hello,

I didn't really understood can you tell me with an overview as to how can I give PWM input to the BLDC motor from raspberry pi with the help of ESC/VESC

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Controlling BLDC motor with VESC 4.12 and raspberry pi