- 4-Wire drive- most LCDs need at least 7 wires for control.
- Input- four small push buttons
- LED output- four small LEDs
- Backlight control- both for LED backlighting and EL backlighting
- Encoder input- knob to turn for input control, backlight dimming, or whatever.
Other items I'm going to work on this week:
Magic square wave generator- an 8-pin IC that generates square waves up to a couple hundred kHz, with variable duty cycle, all set by grounding pins or connecting resistor dividers to them. Much easier than figuring out values for 555 timers. I need this for my laser-gun project.
Encoder decoder- translates the quadrature output from an encoder to pulse/direction or pulse/pulse. Actually, I already made this, for free-turning steering wheels to go on a buddy's MAME cabinet (Ironman Ivan Stewart's Super Off-road FTW!).
Remote mini-joystick control panel for the Arduino- not necessary for the laser-gun project, but it might make it more fun if a second user can move the target around. I bought some teeny little joysticks from Mouser- should be really cool!