Casio fx-502P — I2C expansion possibilities

[blackjetrock]

The board works with the 501 and 502. The 601/602 uses the same interface hardware but a slightly different command set. This is a bit odd as they both talk to the same peripherals. My 502s are more reliable than my 602s and so I developed the code on them. I'll probably have a go at getting a 602 working as well if i can keep one working long enough.

Andrew