Do I need to water the garten ? How was the weather over the past n days ? Can I check my PI for this info also when I'm remote ?
For details on how did I do this:
http://www.jasm.eu/2013/05/28/raspberry ... ty-sensor/
For question and comments, please use this thread.
The post above covers these topics:
- how to measure the temperature & humidity
- save the measured data in a csv file containing no more than the values for the past n days.
- react on incoming mails requesting the chart for the past values and send the chart as attachment via eMail.
- How to generate the chart based on the data from the csv file.