Here is some infos about an OMG compatible 433Mhz sensor, the KERUI Z31 shock detector. This sensor send 3 different signals:
- vibration detection
- sensor removal (tamper)
- low battery
The sensor is powered by 2 AAA batteries.
Power consumption
Sleep current 4.5uA continuously ( measurement below my multimeter accuracy )
When triggered measurement is of 20mA during 3s
Duration estimation
AAA battery capacity is 1000mAh
Sleep current per day ->0.01mA * 24 =0,24mAh per day for sleep
4 sending per day 4* 20/3600 = 0,022mAh per day for sending
Total per day: 0,26mAh
1000/0,26=3846 days → around 10 years … of course this doesn’t take into account the battery discharge rate.
Some pictures:
signal when tampering
signal when vibration detected
Unboxing
Disassembly 1
Disassembly 2
