Quantity   Component name
1 × spare phone (android froyo 2.2 minimal version) using galaxy ace with gingerbread 3.7
1 × RPI like board embedding linux distribution here cubieboard 2 with arch linux arm
1 × A dedicated sim card with data plan can be purchased in France for as low as 5eur/month for 20GB
1 × 12V solenoid valve I used one from water timer
1 × water flow meter