SD Library writing char in a file - Arduino Stack Exchange A way to do this is to copy the contents of the string to char array. char inputString1 [80]; // general purpose input string, 80 bytes char inputString2 [80]; // general purpose input string, 80 bytes char outputString [80]; // general output string, 80 bytes. 您需要登录后才可以回帖 登录 | 立即注册. strcpy dtostrf() - turn your floats into strings Noticed that it is directly access to the buffer in the String object and you are not supposed to change it. Accessing Arduino Program Memory PROGMEM - Arduino Reference Arrays in the C++ programming language Arduino sketches are written in can be complicated, but …