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Reading electricity meters with Arduino MKR

MKR MBUS Slave Shield

Arduino IDE

Arduino MKR WiFi 1010

<html><body><p>Electricity meters with a so-called P1 interface contain a rudimentary MBUS master that periodically outputs the (electricity) meter data in encrypted form. Meters with such interfaces are common in many European countries, such as Austria and Norway. In order to read the counter, an MBUS slave is required. In this example I would like to show how you can read and decrypt the data of such counters using our <a href="https://www.hwhardsoft.de/deutsch/projekte/m-bus-mkr-shield/">MBUS slave shield for Arduino MKR </a>boards and Portenta. </p><p></p><p></p><div id="gallery"><img id="gallery" src="https://projects.arduinocontent.cc/098e4f81-5dc7-416e-88e7-448af0f99549.jpg"/><figcaption></figcaption>,<img id="gallery" src="https://projects.arduinocontent.cc/806102ef-7b2d-493c-b167-dd252833d1f8.jpg"/><figcaption>MBUS Slave shield for Arduino MKR</figcaption>,<img id="gallery" src="https://projects.arduinocontent.cc/431dd6ef-4ed0-4717-8c01-5fa5406b3e22.jpg"/><figcaption>MBUS Slave shield for Arduino MKR</figcaption></div><h3>Connection with the meter:</h3><p>On many electricity meters, the MBUS is provided via an RJ12 Jack. The MBUS is brought out on pins 3 and 4. The two MBUS signals must be connected to the terminal block of the MBUS-Slave wing or shield. The polarity does not have to be taken into account since the MBUS on the slave has no polarity. </p><p></p><figure><img src="https://user-images.githubusercontent.com/3049858/263541267-3450de44-6f11-47fe-b2e2-5701e3a5a49e.png"/><figcaption>undefined</figcaption></figure><p></p><h3>Key for decryption</h3><p>The user data in the MBUS protocol is encrypted. For decryption you need a corresponding key from your energy supplier. The 16-byte key is usually provided as a hex string. This string must be stored as a byte array in the key.h file. </p><p>For example  key from supplier: 36C66639E48A8CA4D6BC8B282A793BBB </p><p>in key.h: </p><pre><p>static const unsigned char KEY[] = {0x36, 0xC6, 0x66, 0x39, 0xE4, 0x8A, 0x8C, 0xA4, 0xD6, 0xBC, 0x8B, 0x28, 0x2A, 0x79, 0x3B, 0xBB};  <br/></p></pre><p></p><h3>Additional libraries</h3><p>Install the following library through Arduino Library Manager </p><p><a href="https://rweather.github.io/arduinolibs/crypto.html">Arduino Crypto Library </a>by Rhys Weatherley </p><p> </p><h3>Remarks</h3><p>The code was tested with Kaifa MA309M and Sagemcom T210-D (both data Lower Austria). In other countries and regions (e.g. Vorarlberg, Austria) the structure of the user data may differ and an adjustment of the program may be necessary. </p><p></p><figure><img src="https://user-images.githubusercontent.com/3049858/263540720-a5ca355f-043a-423e-a036-43d0d01d43e5.jpg"/><figcaption>undefined</figcaption></figure><p></p><p></p><p></p></body></html>

Reading electricity meters with Arduino MKR

read the consumption data of your electricity meter with P1 port via DLMS/COSEM protocol