have a look at
https://raymondtunning.wordpress.com/2016/09/08/best-wireless-cam-solution-a6c/

Maybe look at AI-thinker A6c module that has direct camera interface and sends pictures as MMS over GSM.

Maybe you could use an ultrasonic distance sensor to detect if anything is in its measuring range?

If you are not going to use mysensors look at library example
https://github.com/mcleng/MAX6675-Library/blob/master/examples/read_temp/read_temp.pde

example has to be converted to 2.x of mysensors.
To do so you need at least to add
#define MY_RADIO_NRF24
remove all gw.
please look at any 2.x example to see what have changed.

@Ezequiel-Torres I did just connect pin 3,4,5 and vcc,gnd to module and sensor to module. Look in example code for directions.
Example is made for mysensors 1.4 or 1.5 so may have to modify it a bit.

Many mosfet does not open fully on 3,3V. You have to check graph in datasheet when choosing mosfet.
You can pull gate high with a resistor to 12v and use a npn transistor to pull it low.
But that makes it default on. If sensor node fails all leds will be at 100%.
My ledmodule uses IRLR2905 and is powered by a 5v promini.

I am also in the same process of upgrading my sensors and have also seen this behavior (not finding parent node).
First I thought the radio was broken and changed radio. That got it going but the problem came back. Then I realised that problem comes from resetting the node and not turning power off completely. I had to disconnect my USB-serial adapter and power to make it work.

I am also interested to participate if the meeting is is someday between 2-11 july as I am visiting skåne then.

@jeti said:

@Nicola-Reina said:

Anybody wanting 10 kits at a bargain price. I am sellling them at bargain price due to lack of time to play with them.
If you are in Rome I can hand it over directly . If you are at EU maker faire this week end even better see you there.
Otherwise I ship them too

KR

Still got the 10Kits?

You can still buy these kits from my homepage.