General I2C advice

[malc-c]

Guys, once again, thanks for the heads up with regards to the amount of data I could store. I guess the only options I have is to reduce the sample rate down, or, if 512 will store 3 and a half days, then 1024 would hold around a weeks worth....

I have one of these home weather station



http://www.foshk.com/Weather_Professional/WH1080.htm

Not sure what memory it has, but it sends temperature, wind speed, wind direction, rain fall, air pressure and humidity readings at least every 5 min and can store two weeks worth before roll over !

Does increasing the size of the memory have other problems when used with PICs?

If used on the same pins that the RTC (DS1307) is connected to what would be the ideal address to use, and do I use the IC2WRITE / IC2READ to send / retrieve data ?

[aberco]

RTC and EEPROM can share the same I2C bus, and they have their own address (check the datasheet). A0/A1/A2 allows you to put more EEPROM on the same bus, but it won't conflict with the RTC (MSB part of the address is hard-coded in the device, and LSB part can be set up by user depending of the device).

You could also use an SD-card as your storage medium. It is a bit more complicated to use, especially if you want a FAT system (check on this forum there's some examples).

I would go with I2C EEPROM, but storing data in binary rather than ASCII.