Assertion: series resistor | /r/HasProperty | connected to the gpio pin
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text: The design of latter is particularly significant if the external circuit is running from supply rails in excess of 3.3 Volts because in that case the pull-up must not try to raise the voltage on the line to above 3.3V - a series resistor (say 4K7) and a Schottky diode (e.g. a BAT85) with its anode to the side of the series resistor connected to the GPIO pin and its cathode to the 3.3V supply rail is one way to prevent this - the low ( < 0.2V ) forward voltage drop of that type of diode prevents the signal line being taken high enough to damage the Pi, at the expense of a slightly increased time for signals to propagate into the Pi.