Hello
I create a small cnc for a diode laser and works very fine with lightburn software
Now i add two limit switches to homming
this is the board i use 
The problem its when start homming and reatch the limits the machine wont stop!
Thanks
What types of switches do you have and how have you wired them?
Assuming that the switches are correctly connected to the board, has the function been activated and configured?
i used this switches
the board require 3 wires, 5v gnd limit
if i homming and i click on limit switch with my hand the green led goes green but the machine continue.
hello yes
$1=25
$2=0
$3=3
$4=0
$5=0
$6=0
$10=1
$11=0.010
$12=0.002
$13=0
$20=0
$21=1
$22=1
$23=2
$24=25.000
$25=3500.000
$26=250
$27=5.000
$30=1000
$31=0
$32=1
$33=1
$35=0
$36=1
$37=1
$38=10
$39=0
$100=80.000
$101=80.000
$102=0.000
$110=20000.000
$111=20000.000
$112=20000.000
$120=500.000
$121=500.000
$122=500.000
$130=1500.000
$131=1500.000
$132=300.000
From what I understand, I would say that the limit switches and homing are activated.
The limit switch signal will probably be inverted and it will be necessary to change wires. But wait for opinions from those who understand much more than me. 
i have grbl 1.1f if i flash for 1.1h its better? thanks
Are these NO or NC switches?
How have they been wired to the controller?
This will not make a difference.
Hello they are NC
By default GRBL expects NO switches. You can invert this in GRBL $5 (Limit pins invert). Try switching to 1 and retest.
I read in other side i have to invert the with and red wires
How is it currently wired?
Power cycle the laser after making the switch.
Are you able to rewire the switches to make them NO? That might be preferable since your switches aren’t equipped with any current limiting circuitry.
with the $5=1 they are working now but if i click obtain position the X axis its negative
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