keukenrol/p1-esp-be

P1 port reader for belgian electricity meters Sagecom T211 and S211

P1 port reader for belgian electricity meters Sagecom T211 and S211

Software for the ESP8266 / ESP32 that sends P1 smart meter data as a string to a TCP port (with CRC checking). These meters have an open collector output, thus they require a pullup to 3.3V / 5V and an inversion of the signal (see included schematic).

Requirements for Arduino IDE

--- BOARDS ---

• esp32 v2.0.9+
• esp8266 v3.0.2+

--- LIBRARIES ---

• None

--- Functionality ---

• ArduinoOTA from board package
• Check Wi-Fi for both boards

Installation instrucions

• Make sure that your ESP8266 / ESP32 can be flashed from the Arduino environnment.
• Place all files from this repository in a directory. Open the required .ino file.
• Adjust WIFI settings
• Adjust TCP server and port
• Add / delete messages as required for output string
• Compile and flash

Connection of the P1 meter to the ESP

You need to connect the smart meter with a RJ11 (4 pin) or RJ12 (6 pin with +5V and GND) connector. More information here: https://www.cdem.be/13_technical/#what-information-is-provided-with-the-p1-port

Invert the input to 3.3V logic for ESP using a BC547B NPN transistor or similar:

Connect GND->GND, RTS->REQ_PIN, and RxD->RX pin. By default, the req pin and the npn base input are on 3.3V. If this does not work, then supply 5V for these by using a level shifter from the output of the ESP for the REQ_PIN and connect the R2 to +5V.