Easy wifi display and keyboard for the HP-75c

[coitboy2000]

I have managed to piece together a pretty cheap and easy to setup DISPLAY option for the HP-75c and HP-71b.

I use the following parts:

- J-Fs Pil-io
- ESP8266 proto board
- Logic converter for 5v to 3.3v
- breadboard
- ESPTerm firmware from esptetm.github.io/term.html
- esp flash tool

What you can do after flashing espterm firmware and setting up your espterm WiFi , is log into a browser and navigate to the terminal window, type DISPLAY IS :PILSER1D or equivalent and you have a working display in your browser. It seems to parse most of the output pretty well. The HP-75c works almost flawlessly and the KEYBOARD IS also works so you can use your desktop keyboard to control the HP-75c.

A couple of photos are attached.

The DISPLAY IS also works pretty wrll for the HP-71b with the exception of the arrow keys. The KEYBOARD IS also does not work with this setup as explained by J-F in my recent post.

https://www.dropbox.com/s/rutudh9r9el9sp...1.jpg?dl=0

https://www.dropbox.com/s/hp9b0ii1mez2t9...0.jpg?dl=0

https://www.dropbox.com/s/330bzs6zizlnnd...3.jpg?dl=0

Cheers