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SONOFF DW1 door sensor (one state)


This door/window sensor is powered with a 12V 23A battery and send one signal when opened.

The protocol used is compatible with these different gateways: 
  • ZgatewayRF (ESP32 or ESP8266 with an RF receiver)
  • ZgatewaySRFB (Sonoff RF Bridge)
  • ZgatewayPilight (coming with WDS07 integration)
Here is the official link:



Now if we take a look to the power consumption of this sensor we can see that:
  • When sending signal 10mA during around 2s
  • Sleep current less than 2uA continuously

Duration estimation
See relative comparison into the list of compatible devices 1
It should last more than 1 year.

Some pictures:
Power consumption when no action

OpenMQTTGateway_devices_SONOFF-DW1_sensor_back

OpenMQTTGateway_devices_SONOFF-DW1_sensor_back.png369×657 99.5 KB

Disassembly

OpenMQTTGateway_devices_SONOFF-DW1_disassembly

OpenMQTTGateway_devices_SONOFF-DW1_disassembly.png470×860 357 KB

We can see that there is some key (1,2,3 & 4) in the PCB, maybe this can be soldered to change the code (I didn’t tested it).

You will notice that the antenna is integrated into the PCB.

I'm not a fan of the 12v23A or 27A batteries but the power consumption when sleeping is the best from all the window/door sensor I have tested.

On the functionality side the sensor is lacking a code for close state.

If you want to use it as alarm detection only (not verifying if your door is close or open) this sensor can be interesting if not you should go for a GS-WDS07 or a the new DIGOO

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