ok.. i ll read examples of analog data logger and SdFat library and then code
I ve also got Raspberry pi if it is easier on that..though i ve never used it till now .. !!
The Pi does not include a hardware analog to digital converter, but a external ADC (such as the MCP3008) can be used along with some bit banged SPI code in python to read external analog devies. Here is a short list of some analog inputs that could be used with this setup.