"is_ready()" does not return "false" when D-OUT pin disconnected.

[HamidSaffari]

Hi. "is_ready()" does not return "false" when D-OUT pin disconnected. the reason is noise caused by High-Impedance of input pin. the solution is to configure internal pull-up resistor. so in begin(): pinMode(DOUT, INPUT);
should change to: pinMode(DOUT, INPUT_PULLUP);

[Flying-Bolt]

You are right! THX

[bogde]

@HamidSaffari thanks for your feedback. what hardware did you use?

[Flying-Bolt]

an atmega32u4 bettle.