Hello,
could you advise me how to hardware protect the unconnected RX and TX pins from interference?
I have one software for many ESPs, sometimes the RX and TX are connected, sometimes not. I need to treat noise intrusion on unconnected pins by hardware.
For me the best way is to connect RX and TX together (or use SMD rezistor). Is it good idea?
Disclaimer: not familiar with ESP32.
You don't have to worry about Tx if you always configure the serial port (Serial.begin()). For Rx, you can use a pull-up resistor. I would advise to read the ESP32 datasheet to see what is advised.
Note that you actually need to give all unused pins a pull-up or pull-down resistor to prevent spurious switching of the internal circuits; this is especially important when using low power modes.
See if this document helps:
OK, thank!
This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.