long back when digital portables where in their infancy, people were already loath to type on small keyboards, stylus or not. So palm made a wonderful bit portable keyboard that would fold up as well as in shape in your cargo pocket. as well as what do we have now for high-end typing on the go? Rubber roll-up jelly keebs? That’s a difficult no from this scribe.
But why mess with the success of the the palm portable Keyboard? It just needs to be updated for our times, as well as that’s precisely what [Xinming Chen] did with their PPK Bluetooth adapter.
Inspired by the work of [cy384] to make a USB adapter in addition to [Christian]’s efforts with the ESP32, [Xinming Chen] explains that this version is much more power efficient, simpler to program, as well as has a built-in Li-Po charging circuit. It likewise utilizes the hardware serial port instead of the software application serial, which saves brainpower.
There’s truly not much to this build, which depends on the Adafruit Feather nRF52840 as well as will easily work with palm III as well as palm V keyboards. because the PPK is RS-232 as well as needs to be TTL, this circuit likewise needs a voltage level inverter which can be made with a little handful of components. We like that there’s a small hidden switch that engages the battery when the adapter clicks on to the connector.
The schematic, code, as well as STL data are all there in the repository, so go pick up one of these foldy keebs for inexpensive on the electronic bay while they’re still around. view the demo video unfold after the break.
Want an all-in-one service for typing on the go? inspect out the history of small computers.