Pin.IN value always 1

[feiming]

Hi, I'm new to this micropython and esp8266.

I'm trying to read pin value. It always return 1 even when there's nothing connected to the pin.
how do I make sure it's reading correct value?

[code]
>>> from machine import Pin
>>> pin = Pin(14, Pin.IN)
>>> pin.value()
1
[/code]

[Christian Walther]

The state of an input pin is undefined when there is nothing connected to it. Have you tried connecting it to GND or 3.3V? (This applies to all digital circuits, not just the ESP8266.)

[Scarsz]

You can use the Signal class to invert the output, if that's what you're going for

signal = machine.Signal(pin, invert=True)
signal.value() # 0 if not connected to ground, 1 if connected to ground