sanalejo171
commented
5 years ago Hello, I've been 2 days, testing 1 by 1 ALL the ramp pines, I can turn on and off the SPINDLER (DRILL) but none has pwm control, because they only mark 0 or 5v ........ IT ALSO WORKS ME PROBE or analog 15 or none, and probe one by one ....... someone found the solution? Or will I have to go back to Arduino one?
Hi all in the process of building a CNC powered by a Arduino Mega 2560 and Ramps 1.4. Almost everything is working great but having some issues with the PWM voltage output on Pin 6 to control the VFD. I've spent days working through all the issues reluctant to post for help but this one has stumped me.
The issue is the voltage directly from Pin 6 when issuing M3 S24000 (My Max RPM) only produces 4.89V.
This then goes through a PWM module, as I wanted something tidier than a home made lowpass and also wanted to boost the level from 5v to 10v (http://www.chinalctech.com/index.php?_m=mod_product&_a=view&p_id=1122) and the max voltage I can output is 4.34V with the pot wound all the way up and with a 12v VCC input to the module.
I was wondering if it was a frequency issue so i've tried 255 and 1024 in place of the Max PWM value.
I'm very much on a steep learning curve but any help would be very much appreciated .
Thanks in advance!
I've amended the code as at the bottom of the post in cpu_map.h.
// Advanced Configuration Below You should not need to touch these variables // Set Timer up to use TIMER4C which is attached to Digital Pin 6 - Ramps Servo 2
define SPINDLE_PWM_MAX_VALUE 1024.0 // Since it's a 8bit timer
ifndef SPINDLE_PWM_MIN_VALUE
define SPINDLE_PWM_MIN_VALUE 1 // Must be greater than zero.
endif
define SPINDLE_PWM_OFF_VALUE 0
define SPINDLE_PWM_RANGE (SPINDLE_PWM_MAX_VALUE-SPINDLE_PWM_MIN_VALUE)
define SPINDLE_TCCRA_REGISTER TCCR4A
define SPINDLE_TCCRB_REGISTER TCCR4B
define SPINDLE_OCR_REGISTER OCR4A
define SPINDLE_COMB_BIT COM4A1
define SPINDLE_TCCRA_INIT_MASK (1<<WGM41)
define SPINDLE_TCCRB_INIT_MASK ((1<<WGM42) | (1<<WGM43) | (1<<CS41))
define SPINDLE_OCRA_REGISTER ICR4
define SPINDLE_OCRA_TOP_VALUE 0x0400 // PWM counter reset value. Should be the same as PWM_MAX_VALUE in hex.
// Define spindle output pins.
define SPINDLE_PWM_DDR DDRH
define SPINDLE_PWM_PORT PORTH
define SPINDLE_PWM_BIT 3 // MEGA2560 Digital Pin 6
endif