![]() Conversely an external relay connected to GPIO15 must be connected between GND and the pin so that is does not interfere with the action of the pull down resistor. ![]() For GPIO0 and GPIO2, an external relay must be connected between VCC and the pin so that it does not interfere with the action of the pull up resistor. This determines how any external device, like a relay or led+resistor, must be connected. ![]() As noted above, these pins will already have a resistor connected to either VCC (GPIO0 and GPIO2) or GND for GPIO15.
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