He’s been looking into different interface options with the GPIO header and just posted a guide to using an HD44780 character display with the RPi.

Also the original serial of the Raspberry Pi is 3.3V Compatible so we have Voltage Level Converter on the HAT which Converts it into 5V and also there is an TTL to RS232 Level Converter With DB9 ...

Looking for something to do with a Raspberry Pi mini-PC? These easy and practical projects are good for all levels, even beginners. Streaming. Gaming. Networking. Even printing!