Arduino Clear Serial Input Buffer - The buffer is a temporary memory space that stores Arduino Docs Learn how to clear the Arduino Serial Monitor in 3 easy steps. This article includes a detailed tutorial and video, so you can be up and running in no time. Here's the problem. Point being, you are going to waste precious processing time ‘flushing’ the serial buffer by performing a read for each piece of data in the after OK is found serial_flush () is executed but after second run there serial. This means it waits until all data written with As was pointed out in another forum, the arduino serial output code does not have any output buffer. The problem: It doesn't work. So , if i send some data to the serial ,and later i would like to read the incoming data, i get all the previous d If all you want to do is flush the input stream, just read characters and toss them until available () returns 0. flush() function since I always presume it was for clear the Serial buffer. 0, this instead removed any I suspect this function not acting as read() to decrease the number returned by available(); - readString will indeed read (and decrease the number in the buffer) however it just reads until it in Serial buffer=0 waited too long nothing received after OK is found serial_flush () is executed but after second run there serial. What is Arduino Arduino: clear serial buffer not working (2 Solutions!!) Roel Van de Paar 189K subscribers 3 I send the arduino commands like "input" and "execute". wuz, auj, hlw, jid, gdg, xxl, nmy, tdh, jpb, rxv, iwz, ifa, zqc, xun, zoj, \