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Thread: RawHID with an Arduino Micro - communicating with a PC program

  1. #1
    Junior Member
    Join Date
    Jan 2018

    RawHID with an Arduino Micro - communicating with a PC program

    Hi all, this is my first post. Not sure if this is the proper forum to ask this question. If not, then I hope you can guide me in the right direction!

    I am using Arduino Micro boards that have an ATmega32u4 chip. I would like to use Nicohood's HID library to transmit data over the USB line rather than using the standard Arduino serial library. The reason is that I would like higher speeds than serial can give me. The serial line (with a baud rate of 115200) maxes out at around 7400 bytes/second. I would like to send anywhere from 8,000 to 10,000 bytes/second.

    Nichood's code includes a RawHID library. I have written the following code that runs on my Arduino Micro board:

    #include <HID-Project.h>
    uint8_t raw_hid_data[255];
    void setup() {
      RawHID.begin(raw_hid_data, sizeof(raw_hid_data));
    void loop() {
      //Create a 100 byte buffer and fill it
      uint8_t mega_buff[100];
      for (uint8_t i = 0; i < sizeof(mega_buff); i++)
        mega_buff[i] = i;
      //Send the buffer
      RawHID.write(mega_buff, sizeof(mega_buff));
      //Send a character over the serial line
      //Pause for 1 second
    I have some C# code that I am writing on the PC's end to read in the data. The Arduino Micro shows up with a VID of 32823 and a PID of 9025. I am able to connect to it successfully. I am using the HidSharp library in my code, and developing the application using Visual Studio.

    Unfortunately, when I try to read the data from the HID device, it just times out. No data is available to read. I can post some of the C# code if desired.

    Any ideas on what I could be doing wrong? Thanks for any ideas!

  2. #2
    Senior Member PaulStoffregen's Avatar
    Join Date
    Nov 2012
    Maybe ask on Arduino's forum? You are using an Arduino brand board, afterall.

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