WattWächter WiFi/USB¶
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.
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 |
| 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 |