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I2C LCD and keypad controller using ATTiny2313

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 change – this is to run the 2313 at 8MHz)
avrdude -p attiny2313 -c USBTiny -u -U lfuse:w:0xE4:m -U flash:w:I2C_LCD.hex -U eeprom:w:I2C_LCD.eep


Wire up like this:

Connections for LCD controller

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