I'd like to use the a Grove RGB LCD on a raspberry Pi. I would like to plug it directly with minimal circuitry.
It's a cheap RGB LCD that uses I2C. There are raspberry pi libraries (Python and C)... but it's supposed to be plugged to a Grove Pi which is more expensive but you don't have to.
Has anyone done that already?
The RGB LCD uses a 5V rail. The Raspberry Pi uses a 3V3 rail. If you're going to connect them, you'll need a level converter chip in between them. The GrovePi provides the level conversion, but if you're not going to use the GrovePi for the Raspberry Pi, you'll need to find your own chip or you risk damaging both the Raspberry Pi and the LCD.