Thanks guys!

Good suggestions for the sensors also, far cheaper then the KaKu ones.
I ordered a bunch; now await delivery and off to play

Can i script this with the blockly gui?

Nothing freaky.. ;) I am about to order some parts to build a grandma monitoring system. My grandma is in her 90's and stil happily living alone. She has a "button" she wears (now and than) with which she can call for help. A bit more confirmation would be nice. Could you please have a look before I ...