Writing code for Arduino poses unique challenges. A developer 1) needs hardware-specific knowledge about the interface configuration between the Arduino controller and the I/O hardware, 2) identifies a suitable driver library for the I/O hardware, and 3) follows certain usage patterns of the driver library in order to use them properly. In this work, based on a study of real-world user queries posted in the Arduino forum, we propose ArduinoProg to address such challenges. ArduinoProg consists of three components, i.e., Library Retriever, Configuration Classifier, and Pattern Generator. Given a query, Library Retriever retrieves library names relevant to the I/O hardware identified from the query using vector-based similarity matching. Configuration Classifier predicts the interface configuration between the I/O hardware and the Arduino controller based on the method definitions of each library. Pattern Generator generates the usage pattern of a library using a sequence-to-sequence deep learning model. We have evaluated ArduinoProg using real-world queries, and our results show that the components of ArduinoProg can generate accurate and useful suggestions to guide developers in writing Arduino code. \newline Demo video: \url{bit.ly/3Y3aeBe} \newline Tool: \url{https://huggingface.co/spaces/imamnurby/ArduinoProg} \newline Code and data: \url{https://github.com/imamnurby/ArduinoProg}