I’m amazed. I got home today from our short break in The Smoke and plugged my PICAXE-133Y OLED display into the Arduino Uno, knocked up a bit-basher to send single-wire serial data idling on low and … SHAZAM! It works.
Currently it is running a clock timer next to my PC. I intend now to write a similar bit-basher for the Raspberry-Pi and get it outputting a twitter ticker-tape feed. I should be able to get it working from the UART too. I’m still not sure what went wrong there. But now I’ve at least demonstrated it works.