I finaly published them: sources of my wireless sensors are available here.

To use my dashboard, I wrote some Dashing jobs to be able to query some values from my InfluxDB database.

I recently discovered Dashing.io, which is an easy to use dashboard, which seems to fit my needs :

As I like to have plants at home but always forgot to water them, I bought a cheap resistive soil moisture sensor. Actually, it is just two strips of copper wired as a voltage divider with a 10k resistor, the IC is used as a comparator to have a “digital” output, with a threshold set by the trimpot.