This application reads out the current values of the two energy meters installed in my house. It is based on the raspend python library and runs on my Raspberry Pi 3 Model B+.
The first smart meter is a eBZ DD3 installed by my local energy provider. The DD3 is a 2-directional meter that counts both the imported power and the exported power of my PV system. It comes with a D0 interface pushing data every second. This optical data interface is a unidirectional communication interface using infrared light. The data is read via an infrared read-write head which is attached to the so called Info-DSS of the smart meter. The other end is plugged into one of my RPi's USB ports. My DD3's data is ASCII and is specified by DIN EN 625056-21 (OBIS, MODE-D (IEC 1107)).
The second smart meter is used to measure the power consumption of my heatpump. It is a Finder Series 7E smart meter, which comes with a S0 interface specified by DIN 43864. I connected S0+ of the smart meter to one of the RPi's 5V+ GPIO pins and S0- is connected to another GPIO pin configured as an input pin. Since the minimum voltage for the S0 interface of this smart meter is 5V I had to use a voltage divider. I used one 2K and one 3K Ohm resistor to implement it, so the GPIO pin has a maximum voltage of 3V. The smart meter outputs 1000 pulses per kWh on the interface. These pulses are detected as rising edges on the GPIO pin and counted.
Download or clone this repository, go to its local folder and type:
$ pip3 install -r requirements.txt
This will install all necessary dependencies.
To run it, type:
$ python3 smartmeter.py --port=<port> --serialPort=<device> --s0Pin=<GPIO-pin>
| Parameter | Description |
|---|---|
| --port | Port number the server should listen on |
| --serialPort | Path to the serial port to use for reading the D0 interface |
| --s0Pin | The GPIO input pin used for counting S0 interface pulses (optional) |
Example:
$ python3 smartmeter.py --port=8080 --serialPort=/dev/ttyUSB0 --s0Pin=21
To quit the application, press Ctrl+C.
After starting the script, open your favourite browser and type:
http://<IP-of-your-RPi>:8080/data
You'll get a JSON response like this:
{
"smartmeter_d0": {
"CURRENT_POWER_L3": {
"OBIS_Code": "76.7.0",
"unit": "W",
"value": 811.78
},
"timestampUTC": "2020-02-06T21:37:51.607046+00:00",
"CURRENT_POWER_L2": {
"OBIS_Code": "56.7.0",
"unit": "W",
"value": 960.38
},
"POWER_IMPORT": {
"OBIS_Code": "1.8.0",
"unit": "kWh",
"value": 4457.153
},
"CURRENT_POWER_L1": {
"OBIS_Code": "36.7.0",
"unit": "W",
"value": 619.06
},
"POWER_EXPORT": {
"OBIS_Code": "2.8.0",
"unit": "kWh",
"value": 4541.967
},
"CURRENT_POWER_SUM": {
"OBIS_Code": "16.7.0",
"unit": "W",
"value": 2391.22
}
},
"smartmeter_s0": {
"count": 13756.570000000247,
"timestampUTC": "2020-02-06T21:37:53.330171+00:00"
}
}
If you want to set the initial count of your S0 interface, you can use:
http://<IP-of-your-RPi>:8080/cmd?name=s0Interface.setValue&value=<initial count>
MIT. See LICENSE file.