Nerd Ralph writes:
There’s lots of projects and code online for using character LCD displays based on these controllers, particularly the ones with 2 rows of 16 characters (1602). They’re low power (~1mA @5V), and for only $2 each, they’re the cheapest LCD modules I’ve found. The controllers are over 20 years old, so as a mature technology you might think there’s not much new to learn about them. Well after experimenting with them for a few days, I’ve discovered a few things that I haven’t seen other people discuss.