# Using USB Host Shield 2.0 with CH340 FTDI, USB Serial **URL:** \ **Category:** Programming\ **Created:** [October 14, 2024, 3:06am UTC](https://forum.arduino.cc/t/using-usb-host-shield-2-0-with-ch340-ftdi-usb-serial/1311017 "2024-10-14T03:06:44Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![PrimeTSS](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/primetss/32/1098795_2.png) [@PrimeTSS](https://forum.arduino.cc/u/PrimeTSS)\ **Post date:** [October 14, 2024, 3:06am UTC](https://forum.arduino.cc/t/using-usb-host-shield-2-0-with-ch340-ftdi-usb-serial/1311017/1 "2024-10-14T03:06:44Z")
Trying to connect using the USB Host Shield 2.0 to a USB device (Geiger Counter) that is using a built in CH340 FTDI/UART chip (Not a P2109/1) Which basically uses the Serial FTDI to give access to text commands to get data from device. The Board is a ESP32 without a USB Host controller on board. Does anyone know of any working examples using library with CH340 FTDI/UART? Found these this reference to one but getting compile errors (think it may be because the USB Host Shield 2.0 Library is later version) (.zip contains code) By @ardcp @kaza007 [[Arduino Usb Host Shield 2.0, ch340 driver problem.](https://forum.arduino.cc/t/arduino-usb-host-shield-2-0-ch340-driver-problem/620548)] [[USB Host Shield (max3421e) Receive limitations](https://forum.arduino.cc/t/usb-host-shield-max3421e-receive-limitations/1168464)] ![image](https://europe1.discourse-cdn.com/arduino/original/4X/3/2/4/324718e1507cc510782815c382dea3ac1f46dc8b.png) ---
**Author:** ![PrimeTSS](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/primetss/32/1098795_2.png) [@PrimeTSS](https://forum.arduino.cc/u/PrimeTSS)\ **Post date:** [October 14, 2024, 4:38am UTC](https://forum.arduino.cc/t/using-usb-host-shield-2-0-with-ch340-ftdi-usb-serial/1311017/2 "2024-10-14T04:38:07Z")
Ahh ignore that, got it going was just how I expanded the files. > Created a new folder in USB Host Sheild 2.0 'examples' directory, copied files there then moved \*.cpp & \*.h to the main root folder of the library! Working well sending cmd's & receiving data back from Geiger Counter! Thankyou! Just wonder if you have this code up on GitHub? As could not find! Be really good to try & get a Pull Request up for addition to Felis/USB\_Host\_Shield\_2.0 Repo as really useful bit of code I'm sure many will get value from when hit same issue! [[GitHub - felis/USB\_Host\_Shield\_2.0: Revision 2.0 of USB Host Library for Arduino.](https://github.com/felis/USB_Host_Shield_2.0)] ---
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [April 12, 2025, 4:38am UTC](https://forum.arduino.cc/t/using-usb-host-shield-2-0-with-ch340-ftdi-usb-serial/1311017/3 "2025-04-12T04:38:28Z")
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