Has anyone installed limit switches on their A3? If so could you show how you mounted them and how they are wired? Thank you.
I've not done it yet myself, but this post should help hopefully
If you use my default firmware, you connect 2 normally open (N.O.) switches in parallel between D9 and GND. They should be located at the lower left corner since they are HOME not limit switches.
If you want to split the switches up, you can use my XY Home Sw. firmware and wire the X to D9 and the Y to D10. This allows either N.O. or N.C. switches, if you have a heavy duty CNC this is the preferred method using normally open switches (safer as a broken wire or interrupted sensor won't crash the machine).
All you have to do in software is check the Home Switches option in the Settings menu and automatic homing and zeroing will be enabled. You can then make full use of the preset locations to utilize jigs etc.
I have done it following the instructions/pictures on the topic @Ayesha just gave you. I wired it like @Zax described it with his first picture. Soldering was a bit tricky because I'm not used to, but overall pretty easy.
I'm using LaserGRBL and had to configure the GRBL to enable it : https://github.com/gnea/grbl/wiki/Grbl-v1.1-Configuration
I use soft limit with $20=1, then enter the dimensions of your cutting area with $130 and $131.
You also might need to change the homing axes : in my case they were both inverted ($23, configured with a mask : https://github.com/gnea/grbl/wiki/Grbl-v1.1-Configuration#2--step-port-invert-mask
To fix the switch, I used my design, remixed from a bigger mount (https://www.thingiverse.com/thing:3080317 ). works well, looses a couple millimeters but I'm okay with it.
@Zax I have a big CNC router and it has switches on both ends of all 3 axis's. I would like to do the same on my a3 because I hate to hear the stepper motors grind if they hit the stops. Thanks, Bor
@Bor That’s possible, use the lower left for home switches and set the max travel In Grbl. You won’t hit the end stops any more.
@Thomas-Valloo In T2Laser you just click the option in the settings menu - that’s it.