Introduction¶
The WattWächter WiFi/USB is a device for reading data from digital electricity meters (smart meters or electronic household meters eHz). Data is captured via the optical D0 interface and transmitted via Wi-Fi or USB. See the Supported Meters overview for which meters are supported and which script to use.
The device supports MQTT for integration into smart home systems like ioBroker, Home Assistant, or FHEM.
Features¶
- Tasmota software with scripting pre-installed
- Data transmission via Wi-Fi or USB
- OTA updates (Over-The-Air) for software upgrades
- Four accessible GPIOs for additional sensors
- Deep Sleep support for power bank operation
- Cascading: connect up to four additional WattWächter TTL units
Technical Specifications¶
| Property | Specification |
|---|---|
| Dimensions (D × H) | Ø32 mm × 21 mm |
| Weight | 25 g |
| Magnetic holding force | approx. 8.5 kg |
| Housing material | PLA (Gen.1), ABS (Gen.2) |
| Wi-Fi frequency band | 2.4 GHz |
| Wi-Fi protocol | IEEE 802.11 b/g/n |
| Power supply | USB Type-C, DC 4.8–7.5 V, min. 500 mA |
| Power consumption | < 0.5 W |
| Operating temperature | 10 °C – 50 °C |
| IR LED wavelength | 850 nm |
| Photo sensitivity | 880–1120 nm |