Limits issue

[ameisso]

Hello everyone

I try to add limit switch to my plotter.

I use a laserAxe controller with only two axis

On this board, limits are wired to pin 9, 10 and 12 so I changed changed cpu_map.h like this :

#define LIMIT_DDR DDRB
#define LIMIT_PIN PINB
#define LIMIT_PORT PORTB
#define X_LIMIT_BIT 9   // Uno Digital Pin 9
#define Y_LIMIT_BIT 10   // Uno Digital Pin 10
#ifdef VARIABLE_SPINDLE // Z Limit pin and spindle enabled swapped to access hardware PWM on Pin 11.
#define Z_LIMIT_BIT 12   // Uno Digital Pin 12
#else
#define Z_LIMIT_BIT 12 // Uno Digital Pin 11
#endif
#define LIMIT_MASK ((0 << X_LIMIT_BIT) | (0 << Y_LIMIT_BIT) | (0 << Z_LIMIT_BIT)) // All limit bits
#define LIMIT_INT PCIE0                                                           // Pin change interrupt enable pin
#define LIMIT_INT_vect PCINT0_vect
#define LIMIT_PCMSK PCMSK0 // Pin change interrupt register

I've also changed config.h so it dont try to move Z : #define HOMING_CYCLE_0 ((1 << Y_AXIS) | (1 << X_AXIS))

when I boot up the card with cncjs, I got an alarm. So I hit $H and the axes moves in the right direction. When I close both limit switch, nothing happens, the axis continue to move and never stop.

Note that for now, my switchs are 10cm wires that I shortcut with GND to close them. So I don't think that could be noise related

Here is my $$ output :

> Grbl 1.1h ['$' for help]
> client> $$
> [MSG:'$H'|'$X' to unlock]
> $0=10 (Step pulse time, microseconds)
> $1=25 (Step idle delay, milliseconds)
> $2=0 (Step pulse invert, mask)
> $3=3 (Step direction invert, mask)
> $4=0 (Invert step enable pin, boolean)
> $5=0 (Invert limit pins, boolean)
> $6=0 (Invert probe pin, boolean)
> $10=16 (Status report options, mask)
> $11=0.010 (Junction deviation, millimeters)
> $12=0.002 (Arc tolerance, millimeters)
> $13=0 (Report in inches, boolean)
> $20=0 (Soft limits enable, boolean)
> $21=1 (Hard limits enable, boolean)
> $22=1 (Homing cycle enable, boolean)
> $23=3 (Homing direction invert, mask)
> $24=10.000 (Homing locate feed rate, mm/min)
> $25=500.000 (Homing search seek rate, mm/min)
> $26=5 (Homing switch debounce delay, milliseconds)
> $27=1.000 (Homing switch pull-off distance, millimeters)
> $30=1000 (Maximum spindle speed, RPM)
> $31=0 (Minimum spindle speed, RPM)
> $32=1 (Laser-mode enable, boolean)
> $100=100.000 (X-axis travel resolution, step/mm)
> $101=100.000 (Y-axis travel resolution, step/mm)
> $102=100.000 (Z-axis travel resolution, step/mm)
> $110=10000.000 (X-axis maximum rate, mm/min)
> $111=10000.000 (Y-axis maximum rate, mm/min)
> $112=10000.000 (Z-axis maximum rate, mm/min)
> $120=1000.000 (X-axis acceleration, mm/sec^2)
> $121=1000.000 (Y-axis acceleration, mm/sec^2)
> $122=1000.000 (Z-axis acceleration, mm/sec^2)
> $130=1000.000 (X-axis maximum travel, millimeters)
> $131=1000.000 (Y-axis maximum travel, millimeters)
> $132=200.000 (Z-axis maximum travel, millimeters)

I'll be really grateful for any insight !

Best

[doppelhub]

Sounds like something isn't hooked up correctly. Grbl uses interrupts to determine if a limit switch has tripped. With everything connected, connect a voltage meter (DMM) up to the limit switch pins... if the voltage is ~5 volts in one limit switch position and ~0 volts in the other, then Grbl will see that state change. If you don't see that voltage swing when tripping the limit switches, then something isn't hooked up correctly.

[botio]

#define LIMIT_DDR DDRB
#define LIMIT_PIN PINB
#define LIMIT_PORT PORTB
#define X_LIMIT_BIT 1   // Uno Digital Pin 9
#define Y_LIMIT_BIT 2   // Uno Digital Pin 10
#ifdef VARIABLE_SPINDLE // Z Limit pin and spindle enabled swapped to access hardware PWM on Pin 11.
#define Z_LIMIT_BIT 3   // Uno Digital Pin 12
#else
#define Z_LIMIT_BIT 3 // Uno Digital Pin 11
#endif
#define LIMIT_MASK ((0 << X_LIMIT_BIT) | (0 << Y_LIMIT_BIT) | (0 << Z_LIMIT_BIT)) // All limit bits
#define LIMIT_INT PCIE0                                                           // Pin change interrupt enable pin
#define LIMIT_INT_vect PCINT0_vect
#define LIMIT_PCMSK PCMSK0 // Pin change interrupt register

Maybe try this? since u use "PINB" the number u used can't be 9,10.....

[ameisso]

Hello,

Thanks for the feedback. On the board I had offered connectors on 9,10 for limit switch And I read here that these where on portB ? Did I miss something.

BTW, i switched control board for a more convenient one, so everything is ok for me now.

Thanks