This older guide uses an Arduino board no longer in production. It is suggested you follow the modern guide HID Reporter for building new projects.
This is a project we use here at adafruit to check incoming goods as well as QC products out of manufacturing. If you have a USB device, the chip inside has a unique VID (vendor ID) and PID (product ID). For non-programmable parts, this pair is 'fixed' by the chipset itself. For programmable parts, like a microcontroller, the VID/PID is programmed in. Basically, you can use it to check chipsets and/or whether your Flora, say, has the right bootloader installed.
This is something we have to check a few times a day, so we made stand-alone tester!
You'll also want some sort of display, such as a plain or RGB 16x2 LCD shield kit. Be sure to follow the product tutorial to assemble
Put it together, add code!
OK not a lot going on here, put the LCD shield on top, install the Arduino library, upload the shield demo code & adjust the contrast potentiometer so you know it works. Then upload this code:
// include the library code:
#include <Wire.h>
#include <utility/Adafruit_MCP23017.h>
#include <Adafruit_RGBLCDShield.h>
#include <avrpins.h>
#include <max3421e.h>
#include <usbhost.h>
#include <usb_ch9.h>
#include <Usb.h>
#include <usbhub.h>
#include <address.h>
USB Usb;
Adafruit_RGBLCDShield lcd = Adafruit_RGBLCDShield();
void setup () {
Serial.begin(9600); /* Initialize serial for status msgs */
Serial.println(F("\nVID PID tester"));
lcd.begin(16, 2);
lcd.setBacklight(0x7);
lcd.print("USB VID/PID Test");
lcd.setCursor(0,1);
lcd.print("Waiting for USB");
}
void loop (void) {
// initialize USB
Serial.println("USB Start");
if (Usb.Init() == -1) {
Serial.println("OSC did not start.");
while (1);
}
Serial.println("Waiting for connection...");
while (1) {
Usb.Task();
if( Usb.getUsbTaskState() == USB_STATE_RUNNING ) break;
}
uint8_t rcode = 0;
byte num_conf = 0;
USB_DEVICE_DESCRIPTOR buf;
rcode = Usb.getDevDescr(1, 0, 0x12, ( uint8_t *)&buf );
if( rcode ) {
Serial.print("USB ERROR: "); Serial.println( rcode );
while (1);
}
Serial.print("VID: 0x"); Serial.print(buf.idVendor, HEX);
Serial.print(" PID: 0x"); Serial.println(buf.idProduct, HEX);
lcd.clear();
lcd.print("VID: "); lcd.print(buf.idVendor, HEX);
lcd.setCursor(0,1);
lcd.print("PID: "); lcd.print(buf.idProduct, HEX);
Serial.println("***Done!***");
while (1);
}
That's it! When the ADK is powered it will display:
Plug in something that will enumerate, into the USB port, and you'll see the HEX code for VID and PID
Page last edited July 29, 2025
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