How to set up Eleks machine limit switch in T2 Laser
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Connect your 2 normally open switches in parallel to D9 and ground, fix them at the lower left (0,0) of your machine and enable home switches in the settings. Note: You must be using my Grbl 1.1e firmware.
The home button turns red to identify that it's now a machine home sequence and not just set home. Now you have home switches you can set the machine size so soft limits will prevent you running into the axis ends.
It also allows you to use the preset (stored) locations feature.
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There are several different techniques for limit switches here including my no solder solution... which is a bit redneck to be honest.
http://benboxlaser.us/index.php/topic,1494.0.html
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@Zax hello where will i find d9 on my mana se board please to hook up some limit switches
thanks again
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@oakmeadows64 D9 is a pin on the nano. You can find it by looking at the nano and reading the little pin identifiers.
The other forum I linked has several options for wiring limit switches.
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@nottingham82 Hello Fantstic this relly helps many thanks
kevin
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@Zax yes this is the correct pinout. I just googled nano pinout for a picture reference of where the pins are located. I guess I could have taken a minute and used a genuine eleks pinout map. Luckily we have Zax to do things right
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You can use D9 and D10 if you like, it complicates the wiring (although minor) but does allow simultaneous homing for X and Y.
The default T2Laser firmware (Grbl 1.1e or f) is setup for D9 only, so if you choose to do something different you will need to compile your own hex.
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No. You can use any firmware you like. T2Laser supports Benbox, Mana and any Grbl 8 or higher. It's just that the firmware I provide always has D9 as the home pin for both axis.
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@Zax so if i solder a wire onto the nano d9 and onto gnd and put a limit switch on the other end of the wire then run the software and press the limit switch will this halt my program or do i have to do something else before hand
thanks for any help
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They aren't limit switches per se, they're home switches. Let me explain how it works.
You put one normally open switch on each axis at the 0,0 (lower left), wired in parallel between D9 and GND.
Enable home switches in the menu and the house icon will change to red.
Click the red home icon and the machine will move to the left until it triggers the X-axis switch, then it backs off until the switch is open again. Then it moves forwards to trigger the Y-axis and backs off slightly.
Your machine coordinates are then set to 0,0 and you can use absolute positions (presets).
It's still possible to use work piece home but the machine coordinates are always tracked and available for exact positioning. If you set your machine size (change the Sketch size then click the menu option) it will setup soft limits, which your machine will never go beyond and crash.
So you have homing and limits (via software) all for 2 simple switches.
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@Zax do i have to do the same if i am using t2laser software or was you referring to that software
thanks for your help
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Yes, I was referring to T2Laser.
If you prefer to use some different configuration (limits, 2 pins etc) those are all possible but you would need to compile your own firmware with the correct options enabled. T2Laser will still work with them.
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@mrmister No, that's a little different. You use that option if you have + and - limit switches on the SAME axis wired in parallel as otherwise Grbl wouldn't know which way to move.
