is it possible to have TX for serial comm but still use RX as a normal IO pin for my Arduino UNO? I only have to transmit things in my project and not recieve and I've run out of pins, even the analog ones. So is it possible to have RX as input or output (even if its just input or just output its fine) while still using TX for Serial?
Start by telling us what you are using all of the pins for. There may be some innovative ways in which they can be used to reduce the number required
pin 2-13 for RC522 RFID readers (8 of them), TX for transmitting to mediaplayer, A0-A5 for 8 buttons, so i already need to put 2 buttons on some analog pins but i rather not make it more. So i would like to put my relay on pin 0(RX)
I don't think that is possible with hardware serial, which takes over control of both pins.
Use AltSoftSerial, NeoSWserial or SoftwareSerial for TX only on other pins.
seems like its easier to just put 2 buttons on more analog pins?
Are you out of pins, or not?
yes, thats why i already put 2 buttons on 2 analog pins, the only really free pin is RX. if it isnt possible to put my relay on that, i have to put 3 buttons on an analog pin to free up an analog pin for the relay.
So-called "analog" pins are multifunctional. They can be used for analog input, or digital output or input.
You can read input from several buttons using a single analog input and a resistive voltage divider, but only one button can be active at a time.
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