The brother3 Arduino sketch is currently set up for Brother GX-6750 typewriters. Operation is very simple: simply send ASCII over the serial port, 8N1-115200. Sleep for up to 12 seconds to make sure the line is done printing and we don't overrun buffers.
Requires opencv-processing.
ASCII conversion is very simple: each block of pixels corresponding to an ASCII character is sampled. The average brightness is mapped linearly to a palette of characters, currently 22 characters long stolen from jp2a.