Use more than 2 GPIO pins on the jetson nano?

Autonomous Machines Jetson & Embedded Systems Jetson Nano
1

Hello everyone,

I am trying to control 3 stepper motors directly with the jetson (+ drivers) only I can only find 2 PWM ports. Do you know if it is possible to activate others?

Also, I found these command lines on the forum, but I don’t understand them.

$ cd / sys / class / pwm
$ ls pwm
$ cd pwmchip0
$ cat npwm
$ cd pwmchip4
$ cat npwm

Thanks

3

hello val_lam59,

please note that, you can only access pwmchip0 (@7000a000); you may use pwm/pwmchip0 by exporting them.
i.e. echo '<0/1/2/3>' > /sys/class/pwm/pwmchip0/export

BTW,
you may also refer to below topics for using Nano PWM.
thanks

4

Thanks JerryChang,

otherwise, do you know if it is possible to control nema 23 type stepper motor with the driver-i2c pwm interface PCA9685 module, i did not find an example on the internet.

I saw Jetsonhack’s video with the servo motors, but I would need some power in my project.

Thank you

5

hello val_lam59,

you may have your own implementation to configure period and duty_cycle by using PWM.
thanks