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Initial Setup

Package Contents

  • WattWächter (ESP32-C6 module)
  • IR reading head with magnetic mount
  • USB-C cable for power supply

1. Connect the Device

  1. Attach the IR reading head — Place the magnetic reading head on the optical interface (IR port) of your smart meter. The magnet holds it in position.
  2. Connect USB-C — Connect the WattWächter to a power supply (5V, min. 500mA) using the USB-C cable.
  3. Wait — The LED briefly lights up yellow (startup), then pulses blue (ready for setup).

Compatibility

The WattWächter supports all smart meters with the SML protocol via the optical D0 interface. This covers most modern digital electricity meters in Germany.

2. Set Up WiFi

You have two options to connect the WattWächter to your WiFi network:

Option A: Via App (Bluetooth)

  1. Download the WattWächter app
  2. Open the app and tap "Add Device"
  3. The app automatically finds the WattWächter via Bluetooth
  4. Select your WiFi network and enter the password
  5. Done — the device connects

Option B: Via Browser (AP Mode)

  1. Connect to the WiFi network "WattWaechter-XXXX" (password on the device label)
  2. Open in your browser: http://192.168.4.1
  3. Select your WiFi from the list and enter the password
  4. The device restarts and connects

→ Details: WiFi Configuration

3. Cloud Connection (optional)

If you want to access the WattWächter remotely:

  1. Create an account at login.wattwächter.de
  2. Go to "Add Device" and generate a pairing token
  3. Enter the token in the local web interface under Settings → Cloud
  4. The device is now linked to your cloud account

Local Operation

The cloud connection is optional. The WattWächter works fully locally — all data is accessible via http://ww.local on your home network.

4. Done

After successful WiFi connection, the LED turns green (solid). The WattWächter is now reading your smart meter.

LED Meaning During Setup

LED Meaning
Yellow (brief) Device starting
Blue pulsing Ready for BLE/WiFi setup
Blue + Magenta BLE connection active
Green Connected, all OK
Red pulsing Error (see Troubleshooting)