We’ve seen in the past how HID can be exploited using inexpensive equipment. [Nikhil] has built his own simple device to drop malicious files onto target computers using HID technology.

His solution takes an off-the-shelf high-powered reader, (such as the HID MaxiProx 5375), and makes it amazingly portable by embedding 12 AA batteries and a custom PCB using an Arduino Nano to ...

There are some DIY approaches with either a RasPi ZeroW, or Arduino, which I'd like to avoid for now. For now, I just plug my keyboard in through usb. Not a big deal, I've used wired for 20+ years.