Im new with arduino and I made this function

Question

it does this error: invalid conversion from 'char' to 'const char*' [-fpermissive] how do I fix this? enter image description here

Answer 1

First of all Arduino uses C++ language, The reason for the error: " invalid conversion from 'char' to 'const char*' " is that the function Serial.readStringUntill() returns a , but you are trying to equate it with a character in myList=='A' (anything encased in ' is considered character in C++), you can fix the error by accessing first character from the 'myList' and then equate like shown below，但是你正在尝试用 aUn Serial 返回字符串。 myList=='A'中的字符（包含在'中的任何内容都被视为 C++ 中的字符），您可以通过访问 'myList' 中的第一个字符来修复错误，然后等同于如下所示

myList[0]=='A'