RE: 5" TFT Display and Module RA8875

aspork42 — Wed, 22 Apr 2020 17:04:41 GMT

There are some other simple ways to debounce. Just read the pin. If it is HIGH (aka pressed) then do a delay(100) and read the pin again to see if it is still HIGH. If so, then you react. Like the post above mentioned, break the issue down to its core. Make a new sketch that only reads the touchscreen and does something like write to serial port or flips an LED on or off. Writing to serial port is a little tricky since it is blocking code and could mask the issue; so be sure to use a fast baud rate and print as little as possible - like a single character.

Simple debounce looks like this:

if(digitalRead(pin){

delay(50); // debounce

if(digitalRead(pin){

//react

}

Check out this post for a more in-depth look:

https://learn.adafruit.com/make-it-switch/debouncing

This means the pin must be depressed for at least 50 ms before the program will react. That is fast enough not to be noticed by a human, but slow enough for the system to settle out any contact bounce.

RE: 5" TFT Display and Module RA8875

genebren — Tue, 24 Jul 2018 16:38:07 GMT

Nice update on your design challenge project. Good work on getting everything connected and running. That was some first class detective work there.

Gene