Shelly Shelly H&T Gen3 Matte White – niiskuse- and Temperature Sensor, White

Device identification

• Device name: Shelly H&T Gen3

• Device model: S3SN-0U12A

• Device SSID: ShellyHTG3-XXXXXXXXXXXX

• Device Bluetooth ID: 0x1809

Short description

Shelly H&T Gen3 is a smart Wi-Fi connected humidity and temperature sensor with a large and clear e-paper graphic display.

Key features

• Wi-Fi connectivity: Connects to your home Wi-Fi network, allowing you to monitor data remotely via the app or other devices.

• Large e-paper display: Shows temperature and humidity in a simple and readable way.

• Digital clock: Time is automatically synchronized via NTP.

• Smart home platform support: Supports Google Home, Amazon Alexa, and Samsung SmartThings platforms – enabling voice control and automation.

• USB Type-C port: Allows power via USB (does not charge batteries, but enables continuous power).

• Bluetooth connectivity: Usable during setup.

• User-friendly interface: The device has a restart button for easy manual setup.

• Battery operation: Measures data at specified intervals and sends information only when significant change occurs.

• USB power operation: Measures and updates data more frequently and always sends data to the cloud.

• Environmental tolerance: Operates at temperatures from 0 °C to 40 °C and humidity levels of 30%–70% RH.

• Power source options: Operates with 4x AA batteries (not included) or via USB Type-C.

• Wireless connection: Supports Wi-Fi (802.11 b/g/n) and Bluetooth 4.2 protocols.

• Microcontroller: ESP-Shelly-C38F (8 MB flash memory).

Main areas of application

• Private houses

• Multi-family buildings (apartments, hotels, rental apartments)

• Small businesses (shops, offices, restaurants, gas stations, etc.)

• Universities and colleges

Smart home integrations

• Amazon Alexa: Yes

• Google Smart Home: Yes

• Samsung SmartThings: Yes

Electrical interfaces

• USB Type-C port: For device power only (does not charge batteries).

Connectivity

• Wi-Fi: 802.11 b/g/n

• Bluetooth: 4.2

Measurement and reporting

Battery operation

• Measures every minute

• Updates display when change is ≥ 0.2 °C or ≥ 3% humidity

• Sends data only when change is ≥ 0.5 °C or ≥ 5%

• If no report for 2 hours, sends data unconditionally

• 5-minute cooldown period prevents data distortion

USB-powered operation

• Wakes up every 5 minutes

• Measures, updates display, and sends data to cloud

• Then sleeps for 5 minutes

Manual user reporting

• Button press → measures, updates display, sends data, sleeps 5 minutes

Technical specifications

Physical properties

• Dimensions (without stand): 70x70x26 mm

• Dimensions (with stand): 70x70x45 mm

• Weight: 47 g

• Installation:

  • On a table (with stand)

  • Wall mounting (with screws or double-sided tape)

• Housing material: Plastic

Environmental conditions

• Operating temperature: 0 °C to 40 °C

• Humidity: 30% to 70% RH

• Maximum operating altitude: 2000 m

Electrical properties

• Power (batteries): 4x AA (LR6) 1.5 V (not included)

• Battery life: approximately 1 year (depends on usage)

• Power (USB): USB Type-C (adapter and cable not included)

Sensors

• Temperature sensor: Yes

• Humidity sensor: Yes

• Internal temperature sensor: No

Radio

• Wi-Fi:

  • Protocol: 802.11 b/g/n

  • Frequency: 2401–2495 MHz

  • RF power: <20 dBm

  • Range: up to 30 m indoors / 50 m outdoors

• Bluetooth:

  • Protocol: 4.2

  • Frequency: 2400–2483.5 MHz

  • RF power: <4 dBm

  • Range: up to 10 m indoors / 30 m outdoors

Microcontroller (MCU)

• CPU: ESP-Shelly-C38F

• Flash memory: 8 MB

Software features

• Timers: No

• Webhooks (URL actions): 10 (up to 2 URLs each)

• Scripting: No

• MQTT support: Yes