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Author Topic: Can you wire a proximity sensor directly to a motion control board like a pokeys  (Read 1251 times)

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Offline MN300

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The zener plus 470 ohms is a practical solution for this application.
The 470 ohm resistor will see about 1/8 watt so use 1/4 watt resistors.
Like a blocking diode, it's in series with the 10k pull-up resistor. The voltage drop will be about 0.23 volts. On a system with a lower value pull-up that voltage would be higher so others should check before copying this method.
This combination will also work with systems that can be configured for a pull-down resistor.