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Hardware installation

Adding TTL to Current Reader​

If you want to add an additional TTL read head, follow the next steps.

Step 1: Connect the TTL Reading Head​

Plug the TTL reading head into the IO5 (TX) and IO4 (RX) pins on your Stromleser.Tasmota board.

Connecting the TTL head to the Tasmota board

Attach the TTL head to the second electricity meter’s optical port. Ensure it is firmly aligned with the LED/IR port. If readings later appear unstable, adjust alignment slightly (30–45° tilt often helps).

Attaching the TTL head to the meter
TTL Cable Color Codes (Optional)

Not needed if using Stromleser TTL with Stromleser.Tasmota. Use only when connecting the TTL head to a development board:

  • Red → VCC (+3.3 V)
  • Black → GND
  • Green → RX (IO4)
  • White → TX (IO5)
TTL Cable Color Codes

Next Step​

After successful mounting, continue with the Firmware setup.