A while back @andrewoke was bemoaning the availability of an open source HD4470 I2C LCD and keypad controller. So I wrote one – the code fits into an Attiny2313 (just). ATTiny2313 chips are available for under $2. The AVRDude command line I use to program the ATTiny2313 with Adafruit’s USBTiny programmer is: (note the fuse [...]






