RTduino is the Arduino ecosystem compatibility layer for RT-Thread RTOS. RTduino is the sub-community of RT-Thread community and the downstream project of Arduino. RTduino is an open source project which is compatible with Arduino APIs so that RT-Thread beginners can easily get start to use RT-Thread through Arduino APIs, which significantly reduces the difficulty of learning RT-Thread. Meanwhile, RT-Thread users also can directly run thousands of Arduino third party libraries on RT-Thread by using RTduino.