Morph-S2BkDongle Uses an ESP32-S2 to Create a Remotely Accessible USB Keyboard
USB key with display and buzzer to build remote keyboards with an ESP32-S2.
Wireless keyboards are a great way to clean up desk clutter. Most of those keyboards either use Bluetooth or a proprietary RF protocol. Dr. Philippe Cadic took a different approach for a wireless or remote keyboard. Morph-S2BkDongle appears to a host computer as a HID USB device but is accessible over WiFi.
We previously covered another project from Cadic: the MORPH-ESP240, which is a full-featured, yet, slim ESP32-S2 development board. The ESP32-S2 is a single-core version of the incredibly popular ESP32. The idea behind this new board was to reduce the parts count to build a minimalistic USB device.
The PCB is just large enough to house an ESP32-S2 module, 240x240 IPS display, a sound buzzer, switching power supply, two GPIO buttons, and a USB-A connector.
A target application is to act as a HID USB device such as a keyboard or mouse. For example, using the ESP32-S2's WiFi radio, it is possible to use Morph-S2BkDongle as a remote USB keyboard.
If you would like to build one, Cadic provides the KiCad schematic and bill of materials. The estimated DIY build cost is around $13 USD. The design files are available on this project page, and you can also buy a Morph-S2BkDongle PCB on Tindie.