Wednesday 14th March. 2007

Chip

Today I wrote the python script to read the database and perform the backups, well call rdiff-backup to do the backups anyway. It reads out all the machine and then all the folders for that machine that it needs to back up. The web interface I wrote yesterday is what creates the records. It will run on cron on the server.

I started work on a rainfall sensor. I figure it's going to be the most interesting. It's going to consist of a tube to collect water from a funnel. It will then internal probes so that I can measure the water level by measuring the capacitance on the probes. This will be done by a PIC reading the frequency that is outputted from a 555 Astable circuit with the timing capacitor being the tube and probes. With a known RA and RB We can calculate the capacitance or for a more simple approch just map the frequencies to the volume of water.

I really should get the receiver working!

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