There is no need to do this anyway you can always read in software the state of an output pin.
Hi All,In the documentation, it said that when a pin is configured to be an input pin, the pin will have high impedance as if it is connected in series to a mega ohm resistor. Can I connect an input pin to an output pin on an Arduino UNO without a current limiting resistor?
Quote from: CrossRoads on Mar 30, 2013, 01:34 pmYes.But be careful that the pin on the other chip never becomes an output pin with the opposite state. 5V out on one pin and 0V out on the other = dead pins.(Maybe you could put in a resistor, just in case...)
There is no need to do this anyway you can always read in software the state of an output pin. Besides this your code set the output state so you can always keep track of that with a variable.
Ah, its between two different parts. Should have mentioned that initially.So Rx to Tx, Tx to Rx, that is connecting input to output.