Mks grbl-lpc laser autofocus

Garas_Dj · March 4, 2021, 1:55pm

hello everyone I use the grbl version on a mks sbase with great success. The version used is by Claudio Prezzi. Attached is my connection diagram. The problem is that I would like to connect a sensor that makes me autofocus via the macro buttons of lightburn. I have already created the system to make the laser head go up and down. Do you know where I can connect an optical sensor?
the project to make it public once completed as I did for all the modification of the k40

Thomas_Scofield · March 4, 2021, 5:33pm

Try the y max pin

github.com

cprezzi/grbl-LPC/blob/9b6300a872a1efd3ecb2b741b9b971ac12158edb/grbl/cpu_map.h#L541


#define CONTROL_INT_vect  PCINT1_vect
#define CONTROL_PCMSK     NotUsed // Pin change interrupt register
#define CONTROL_MASK      ((1<<CONTROL_RESET_BIT)|(1<<CONTROL_FEED_HOLD_BIT)|(1<<CONTROL_CYCLE_START_BIT)|(1<<CONTROL_SAFETY_DOOR_BIT))
#define CONTROL_INVERT_MASK   CONTROL_MASK // May be re-defined to only invert certain control pins.

// Define probe switch input pin.
// Borrow Y Max limit port for probe
#define PROBE_DDR       LPC_GPIO1->FIODIR
#define PROBE_PIN       LPC_GPIO1->FIOPIN
#define PROBE_PORT      LPC_GPIO1->FIOPIN
#define PROBE_BIT       27  // borrowing y-max pin
#define PROBE_MASK      (1<<PROBE_BIT)

// The LPC17xx has 6 PWM channels. Each channel has 2 pins. It can drive both pins simultaneously to the same value.
//
// PWM Channel      PWM1_CH1  PWM1_CH2  PWM1_CH3  PWM1_CH4  PWM1_CH5  PWM1_CH6
// Primary pin      P1.18     P1.20     P1.21     P1.23     P1.24     P1.26
// Secondary pin    P2.0      P2.1      P2.2      P2.3      P2.4      P2.5
#define SPINDLE_PWM_CHANNEL           PWM1_CH6    // BED MOSFET (P2.5)
#define SPINDLE_PWM_USE_PRIMARY_PIN   false
#define SPINDLE_PWM_USE_SECONDARY_PIN true

I have used it with a contact sensor using a router, not sure what modifications may be needed to work with an optical sensor.

Garas_Dj · March 9, 2021, 8:57am

it works thanks