I would argue about that :), the display can be used as a very flexible control panel without any state. This simplifies things a lot. I'm just sharing my expirience, it may be just not worth the effort :)
@Yveaux
Tested with 2.2 Beta gateway. Problem seems solved. I am running on 5V 16 Mhz / RF24_PA_MAX now. Could not reproduce the problem anymore. Thx for your help!
Ok, solved it myself. V_LOCK_STATUS is wrong in this case. The expected subtype for S_DOOR is V_TRIPPED. Changed it in the sketch and everything works as expected.
Ok, as it seems I did not look good enough. There is an diode (smd M7) between the input jack and the vin pin. This diode is rated 1A. So this will be the maximum current available to the whole arduino + shield. I will put a jack on my shield and feed the arduino from the shield and not vice versa.
Interesting stuff. I have similar valves and thermostats to control them. It's an older floor heating system where the thermostats are starting to fail. I've been thinking of doing something similar since the thermostats, even ugly ones with just a dial and no lcd cost $50 a piece or something. It really starts to add up after a couple of floors.
