Here is some infos about an OMG compatible sensor the new digoo windows/door sensor.
It send 4 different signals:
- Return from tampered
It has an ON OFF switch and is delivered with the battery. Its form factor is quite compact compared to the previous tested door sensors
When sending signal (open or close) 7mA during around 2s
Sleep current 4uA continuously (below my multimeter accuracy)
CR2450 battery capacity is 620mAh
4 sending per day -> 4* 7/3600 = 0,00778mAh per day for sending
Sleep current per day ->0.010mA * 24 =0,240mAh per day for sleep
Total per day: 0,248mAh
1000/0,248=4032 days -> around 11 years
This calcul doesn’t take into account the battery discharge rate, but as it is a lithium one we can expect a best in class discharge. Making this door sensor a very durable one.
Close and open signal:
Tampering switch and repositioning it
Power consumption when no action
Power consumption when action
We can see the tamper switch.