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Added readme

Stan Janssen 5 years ago
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+# Energymeter Python Module
+
+This is a Python module that implements the communication to several electricity meters and related equipment.
+
+At the moment, the following meters are supported:
+
+* ABB B21, B23, A43 and similar ABB meters (Modbus Serial)
+* SMA SunnyBoy (Modbus TCP)
+* MultiCube meters
+
+Some base classes are also provided for you to implement new meter variants.
+
+## Installation
+
+```
+git clone https://gitlab.com/elaad/energymeter
+cd energymeter
+pip3 install .
+```
+
+## Usage
+
+To read all registers from a meter:
+
+```
+from energymeter import ABBMeter
+
+meter = ABBMeter(port="/dev/ttyS0", baudrate=38400, slaveaddress=1, type="B23")
+data = meter.read()
+```
+
+This returns a dictionary with all key-value pairs of data.
+
+To read a single register:
+
+```
+data = meter.read('current_l1')
+```
+
+This returns just the value (usualy a float or int).
+
+To read multiple registers:
+
+```
+data = meter.read(['current_l1', 'voltage_l1_n'])
+```
+
+This returns a dictionary with the requested keys and values.
+
+