ab5 can work as a USB HID keyboard when used in USB-host mode make sure you’re using the correct USB Host wiring and the HID example/library, test with a simple key report first, and verify power/ground are stable (some USB keyboards need extra 5V supply). See discussions and example code in this thread: https://community.m5stack.com/topic/buyers agent/7689/tab5-usbhidkeyboard and check the official docs for that should get you started; post your wiring and code snippets here if you want specific debugging.