求助求助！

C:\Program Files\Arduino\libraries\RobotIRremote\src\IRremoteTools.cpp:5:16: error: 'TKD2' was not declared in this scope

int RECV_PIN = TKD2; // the pin the IR receiver is connected to  显示为开发板编译出错，什么意思？

将arduino-xxx-windows\arduino-xxx\libraries文件夹下的RobotIRemote文件夹删除后重启IDE就可以了，主要原因是这个文件夹中也有IRremoteTools.cpp，导到两者发生冲突。