P1-Meter-ESP8266

Software for the ESP8266 that sends P1 smart meter data to to MQTT on a configurable topic with json. Easy to consume with Pimatic, Telegraf or other software that supports MQTT. I use a nodemcu for this sketch.

Installation instrucions

• Make sure that your ESP8266 can be flashed from the Arduino environnment: https://github.com/esp8266/Arduino
• Install the SoftSerial library from: https://github.com/plerup/espsoftwareserial
• Install the pubsub library from: https://github.com/knolleary/pubsubclient
• Edit pubsubclient.h to set the MQTT MAX MESSAGE SIZE to 512
• Place all files from this repository in a directory. Open the .ino file.
• Adjust WIFI, MQTT and debug settings at the top of the file
• Compile and flash as usual

Connection of the P1 meter to the ESP8266

You need to connect the smart meter with a RJ12 connector. This is the pinout to use

Connect GND->GND on ESP, RTS->3.3V on ESP and RxD->any digital pin on ESP with a 10k ohm pull up resistor placed between the RTS/3.3v connection and the data connection. In this sketch I use D5 for the serial communication with the smartmeter.