I have a doubt in my minitronics I have three pins for endstop and only two wires to connect, does anyone know which ones to use. [reprap.org] Thanks at all https://reprap.org/forum/read.php?1,232893,232893#msg-232893 Sat, 10 Oct 2026 17:07:17 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,232893,233858#msg-233858 https://reprap.org/forum/read.php?1,232893,233858#msg-233858
they work.]]> ttn000 General Thu, 08 Aug 2013 08:31:29 -0400 https://reprap.org/forum/read.php?1,232893,233410#msg-233410 https://reprap.org/forum/read.php?1,232893,233410#msg-233410
Here is the datasheet for that board

[reprapworld.com]

I still cannot find a schematic, however according to the manual pins for x,y,z are

D2 y end stop
D5 x end stop
D6 z end stop


These pins will need to be configured in your pins.h file and may already be depending on firmware version, if not the pin out is in the data sheet provided.

You will need to make sure that the '-' and 's' pins are used as described by Airtripper. I'm not 100% but it does seem to make sense that the 's' pin goes to the arduino chip. Just to be sure follow the traces of the 's' and make sure it goes to the arduino chip. If it does then your likely ok.

Be careful in connecting the pins. If you connect '-' and '+' pins and the mechanical end stop is pressed, the board will likely get damaged.

#define ENDSTOPPULLUPS as Airtripper suggested needs to have '//' removed from front of the text


There still is a chance it may not work. I have no idea if there are pull up or pull down resistors in series to the I/O.

Your best bet with this board is still to contact the vendor, and use optical end stops. They are less than $2.00 a piece on ebay.]]> jamesdanielv General Tue, 06 Aug 2013 20:26:50 -0400 https://reprap.org/forum/read.php?1,232893,233383#msg-233383 https://reprap.org/forum/read.php?1,232893,233383#msg-233383
[reprap.org]]]> Airtripper General Tue, 06 Aug 2013 18:02:39 -0400 https://reprap.org/forum/read.php?1,232893,233376#msg-233376 https://reprap.org/forum/read.php?1,232893,233376#msg-233376
If you could post your pins.h file from firmware it will help us to understand what is the correct setup for you.


don't do what Airtripper mentions.

Airtripper, don't blindly post without doing some research on the minitronics board. I would hate to do anything that would advise someone to possibly blow there board. if the switch contacts and vcc and gnd are shorted, this is what possibly could happen. I don't know that for sure, I do not have a schematic of the minitronics board.]]> jamesdanielv General Tue, 06 Aug 2013 17:28:22 -0400 https://reprap.org/forum/read.php?1,232893,233372#msg-233372 https://reprap.org/forum/read.php?1,232893,233372#msg-233372 -------------------------------------------------------
> I have a doubt in my minitronics I have three pins
> for endstop and only two wires to connect,
> does anyone know which ones to use.
>
> [reprap.org]
> rs.jpg
>
> Thanks at all

The 3 pins give you an option to use mechanical or electronic endstops. The "+" pin is only required for electronic endstops where power is required for the endstop switch circuit that is connecting to the controller motherboard.

Mechanical endstops only require 2 wires to be connected because they simply just sink the signal to ground. The 2 pins required for connection will be the "-" pin and the "s" pin. When using this type of connection, #define ENDSTOPPULLUPS needs to be configured correctly in firmware for mechanical endstops to work correctly.

You'll find more about endstops configuration here]]> Airtripper General Tue, 06 Aug 2013 17:18:20 -0400 https://reprap.org/forum/read.php?1,232893,233078#msg-233078 https://reprap.org/forum/read.php?1,232893,233078#msg-233078
I would advise against this vendor until schematics are posted.]]> jamesdanielv General Mon, 05 Aug 2013 20:34:55 -0400 https://reprap.org/forum/read.php?1,232893,232893#msg-232893 https://reprap.org/forum/read.php?1,232893,232893#msg-232893 does anyone know which ones to use.

[reprap.org]

Thanks at all]]> ttn000 General Mon, 05 Aug 2013 08:39:30 -0400