Humidity and Temperature data logger
This is also a project for the Biology department of University of Athens.
The aim for this project was to crate a cheap, small portable device for logging in an SD card various weather variables.
The user can set number of samples and the time intervals between samples then the device is starting logging the data in the sd card as comma separated text. This makes the further processing very easy for the user because the text file can be easily imported in various software like Excel.
The device is using the SHT15 Sensirion sensor in order to measure the relative humidity(RH) and temperature with an +-2% absolute RH accuracy and a +-0.3°C temp accuracy.
Also a DS1307 Maxim RTC with a battery backup gives the current time and date for each sample.
Finally for powering the device was used a 2cell 7.4V lipo battery, giving max 3 months of continuing logging (depending on the sampling rate)
Photos and code soon..