Does the WSDCGQ12LM need an Aqara hub to work with Edge?

No. It is a Zigbee 3.0 device, so it pairs with the Zigbee radio on an EpiSensor Gateway, and Edge reads it on the Gateway without an Aqara hub.

Why does it sometimes drop off the network?

Aqara battery sensors do not follow the Zigbee standard in every respect. They can disconnect when the signal is weak, when the battery voltage sags, or when they route through some other manufacturers’ routers. Re-pairing it close to the Gateway usually fixes it.

Press and hold the reset button for more than 5 seconds until the indicator blinks three times. It is then ready to pair again.

Aqara WSDCGQ12LM

Temperature and humidity sensor

The Aqara Temperature and Humidity Sensor T1: a 36 mm square Zigbee 3.0 sensor for room temperature, relative humidity and air pressure on one CR2032 cell. Aqara states ±0.3 °C, ±3 % RH and ±0.12 kPa.

Also sold asAqara Temperature and Humidity Sensor T1Aqara TH-S02DYandex YNDX-00523

Zigbee

Temperature and humidity sensor

Compatibility

Compatible with EpiSensor Edge over Zigbee.

Pair it with the Zigbee radio on an EpiSensor Gateway. Edge reads it locally on the Gateway.

Edge reads 7 values from it, listed under Interface.

Connect it with

Gateway ZGW-20
From €899 ex VAT Configure Gateway

Specifications

Aqara says it reports once an hour while conditions are steady, and at once when temperature changes by more than 0.5 °C or humidity by more than 6 %. It is an indoor sensor, and Aqara advises against fridges, kitchens, washrooms and places exposed to rain or vapour. Aqara gives its range to the hub as about 10 m indoors, through walls.³

Power: Battery. One CR2032 coin cell.¹
Temperature range and accuracy: -20 to 50 °C, ±0.3 °C¹
Humidity range and accuracy: 0 to 100 % RH, non-condensing, ±3 %¹
Pressure range and accuracy: 30 to 110 kPa, ±0.12 kPa¹
Wireless: Zigbee 3.0, 2405 to 2480 MHz²
Maximum output power: 13 dBm or less²
Range to the hub: About 10 m indoors through walls, about 65 m in open air³
Reporting: Hourly when steady; at once after more than 0.5 °C or 6 % RH³
Dimensions: 36 × 36 × 9 mm¹
Use: Indoor only²
Firmware updates: Over the air⁴

Where it is used

Room temperature and humidity in offices, meeting rooms and classrooms, where a small battery sensor needs no wiring.
Indoor environmental monitoring
Dry storerooms and small comms rooms within its -20 to 50 °C range. It is not rated for fridges or damp rooms.
Server room and rack temperature monitoring
Barometric pressure logged alongside room conditions, from the same sensor.

Interface

Readings and settings, with units and ranges where Aqara publishes them.^1, 4

Download

Reading	Unit	Range or values	Access
Measurements 3
TemperatureAir temperature, ±0.3 °C.	°C	-20 to 50 °C	Read only
Relative humidityRelative humidity, ±3 %, non-condensing.	%	0 to 100 %	Read only
Air pressureAtmospheric pressure, ±0.12 kPa.	kPa	30 to 110 kPa	Read only
Diagnostics 4
Device temperatureThe sensor’s internal temperature.	°C	-	Read only
Power interruptionsNumber of power outages the sensor has counted.	-	-	Read only
BatteryRemaining charge. Can take up to 24 hours to appear.	%	0 to 100 %	Read only
Battery voltageVoltage of the coin cell.	mV	-	Read only

The battery percentage can take up to 24 hours to appear after pairing. Measurements arrive as the sensor reports them; they cannot be polled. Device temperature is the sensor’s own internal temperature, not a second room reading.⁴

Setup

Open pairing in Edge
In Edge, open pairing on the Gateway’s Zigbee network, with the sensor close to the Gateway.
Hold the reset button
Press and hold the reset button for 5 seconds until the indicator starts blinking. The sensor then joins by itself. If it does not, try a single short press, or a fresh battery.⁴
Confirm the join
Check that Edge identifies it as Aqara WSDCGQ12LM. A single press of the button makes it report its temperature and humidity at once.³
Place it
Stand it in place or stick it on with its adhesive tape, away from metal surfaces, which weaken its signal.³
Check it stays connected
Leave it for a day and check that readings keep arriving. If it drops off, re-pair it closer to the Gateway.⁴

Common questions

Does the WSDCGQ12LM need an Aqara hub to work with Edge?: No. It is a Zigbee 3.0 device, so it pairs with the Zigbee radio on an EpiSensor Gateway, and Edge reads it on the Gateway without an Aqara hub.²
How often does it report?: Aqara says once an hour when conditions are steady, and at once when temperature changes by more than 0.5 °C or humidity by more than 6 %. A single press of the button also makes it report.³
Why does it sometimes drop off the network?: Aqara battery sensors do not follow the Zigbee standard in every respect. They can disconnect when the signal is weak, when the battery voltage sags, or when they route through some other manufacturers’ routers. Re-pairing it close to the Gateway usually fixes it.⁴
How do I reset it?: Press and hold the reset button for more than 5 seconds until the indicator blinks three times. It is then ready to pair again.³