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XTension limit switches 2 wire?

Discussion in 'General Talk' started by mattjones99, Dec 7, 2020.

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  1. mattjones99

    mattjones99 New
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    Hello,

    I have 2 wires already threaded through for the limit switches, but I I'd like to purchase the XTension limit switches. Can these be used with only two wires?

    Also, I have an protoneer board for the raspberry pi, so I'm not even sure where I'd wire the sig cable to.

    Thanks,

    Matt
     
    #1 mattjones99, Dec 7, 2020
  2. Giarc

    Giarc OpenBuilds Team
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    I do not see why they could't be used with two wires. But do so at your own risk. You connect the signal (SIG) wire and the ground (GND), Do NOT connect the 5V or you will potentially ruin your board. Wire them like 2 wire. Read the warning here: docs:blackbox:connect-micro-limit [OpenBuilds Documentation]
    Here is the info on your controller.
    Raspberry Pi CNC - Protoneer - Wiki
    [​IMG]
     
    #2 Giarc, Dec 7, 2020
  3. mattjones99

    mattjones99 New
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    Thank you! If I did run a third wire, where on that board with the 5V wire connect to on that board?
     
    #3 mattjones99, Dec 7, 2020
  4. Giarc

    Giarc OpenBuilds Team
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    I do not know. I have never seen one of those boards in person. Most likely on a 5v power pin.
     
    #4 Giarc, Dec 7, 2020
  5. Giarc

    Giarc OpenBuilds Team
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    #5 Giarc, Dec 7, 2020
  6. sharmstr

    sharmstr OpenBuilds Team
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    I run mine with two wires because I'm to lazy to rewire. :)
     
    #6 sharmstr, Dec 8, 2020
  7. JustinTime

    JustinTime Veteran
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    Isn't there a LED on the switch board that indicate the switch was triggered? If it does, I think that's why the 3 wire system, to power the LED.
     
    #7 JustinTime, Dec 8, 2020
  8. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Troubleshooting LED, Signal Pullup and RC EMI filter. You lose all those with the 2 wire config.
     
    #8 Peter Van Der Walt, Dec 8, 2020
    Last edited: Dec 8, 2020
    Giarc likes this.
  9. anigeek65

    anigeek65 Well-Known
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    Can the xtension limit kit be used on the older openbuild sparc board xpro v2? It only had a 2 wire connector on the board for each axis. So I would be afraid of losing some features. Not really wanting to buy a black box and replace my board for just limit switches with rf.
     
    #9 anigeek65, Dec 12, 2020
  10. Giarc

    Giarc OpenBuilds Team
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    It can be done, but you would loose features with only the two wire connection.
     
    #10 Giarc, Dec 13, 2020
  11. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    If you can find a 5v output pin to provide power to the Switches you can use that to power them
    There should be a 5v output somewhere on your board.
     
    #11 Peter Van Der Walt, Dec 13, 2020

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