• Project Start: July 06, 2024.
• GitHub Activity: and back to Smart Home overview.
• Installed Smart Power Meter: Iskra MT681 with standardized infrared interface. Bought an IR TTL Reader from eBay.
• Transmission Method: Decided to use LoRa with two Heltec LoRa32 dev boards as WiFi signals are too weak.
• Meter Interface: Infrared UART with 9600 8N1, sends messages in SML format. Using sml_parser to decode.
• Unlocking the Meter: Need to unlock with a PIN from the net provider. Without it, only get current energy count in kWh. After unlocking, get energy count in 1/10th Wh and current power in W.
• LoRa PHY: Using RadioLib integrated into unofficial Heltec LoRa 32 library.
• Transmitter Setup: Do lots of deep sleep to save battery. Use watchdog in ESP32 and auto-reset when no messages received for a while.
• Code Integration: Integrated into ESP-Env project and repo (https://git.xythobuz.de/thoma...
• Power Usage Example: Shows a normal weekend with a 1.3kW spike for heating water and other power readings from tasmota sockets or NAS UPS.
• Battery Usage: Battery usage of the LoRa transmitter is very low. Will update when recharging is needed for the first time.