Duet 3 MB6HC - IO Pin Capabilities
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I am designing a customized PCB with a NC microswitch (limit switch) which will be connected later to the IO Pin of the Duet 3 and used as axis endstop. Hence, a few questions:
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As per the documentation, a simple 2-wire microswitch should be connected to the IN and GND pins of the IO connector. Is this 3.3V or 5.0V? Because I wish to connect an LED in series for switch feedback and need to pick an adequate resistor.
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In addition to the microswitch and the LED mentioned above, the PCB has another brighter LED which should illuminate the scene a little bit. Is it somehow possible to turn this LED on/off using the IO connector? I know this would work with a fan connector but with an IO?
Thanks in advance.
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The IO_IN pins are safe up to 30V and require a minimum input of about 0.9V for logic low and 2.4V for logic high. They have built-in 27K pullup resistors to +3.3V. I suggest you connect your LED + series resistor between the input and +5V.
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The IO_OUT pins have a 470R series resistor to protect them, so not suitable for driving high brightness LEDs. I suggest you use a small mosfet or NPN transistor on your board to drive the LED from an IO_OUT pin.
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Nevermind...