servo 0-5V

[alexc57]

Hi, I am trying to use your firmware. OK for X et Y ( I don't have any Z).
My mother board is a mks base 1.6.
I have try to change value for spindle and attribute special pin for servo or pin for Z endstop as PWM. but I don't be able to found a solution.
I have found on github the pin out : MKS Base v1.6_004 SCH.
for X and Y I m agree but when attributed the pin for the servo (0-5V), nothing works. can you help me please. thks in advanced and best regards

[fra589]

Hi @alexc57,

I introduced since version 1.2g.20220917 the possibility of using an additional PWM output (GCode M67/M68 commands). Feature can be enabled with the #define USE_OUTPUT_PWM directive in config.h.

The activation and the choice of the output pin is done in config.h, the PWM parameters are in cpu_map.h and the code is in analog_control.c.

By adjusting the PWM parameters in cpu_map.h to set (among other things) the frequency compatible with the servo, it should be possible to drive it.
https://www.google.com/search?q=atmega2560+pwm+frequency
https://www.google.com/search?q=atmega2560+pwm+servo

@++;
Gautier.

[alexc57]

thanks for the answer and details, trying many thing but nothing works.

[fra589]

Duplicate entry with #209, continuation in the other issue...