Add sensors.py needed for rfm69

sensors.py

@@ -0,0 +1,92 @@
+from __future__ import print_function
+
+import datetime
+
+def crc8(buf):
+        crc = 0
+        for j in range(5):
+                crc = crc ^ buf[j]
+                for i in range(8):
+                        if (crc & 0x80 == 0x80):
+                                crc = (crc << 1) ^ 0x31
+                        else:
+                                crc <<= 1
+        return crc & 0xFF
+
+def csum(data):
+        s = 0
+        for i in range(12):
+                s += data[i]
+        return s & 0xFF
+
+class rawsensor(object):
+        def __init__(self, data):
+                self._data = {}
+                self._data['timestamp'] = datetime.datetime.now().replace(microsecond=0).isoformat()
+                self.__raw = data
+
+        def __str__(self):
+                res = 'RAW RSSI ' + str(self.__raw[1]) + " dBm: "
+                for data in self.__raw[0]:
+                    res = res + ' ' + hex(data)[2:];
+                return res;
+
+        def GetData(self):
+                return self._data
+
+        @staticmethod
+        def CreateSensor(data):
+                obj = lacross.Create(data)
+                if (obj):
+                        return obj
+
+                obj = emt7110.Create(data)
+                if (obj):
+                        return obj
+
+                return rawsensor(data)
+
+class lacross(rawsensor):
+        def __init__(self, data):
+                rawsensor.__init__(self, data)
+                id = data[0][0] << 4 | data[0][1] >> 4
+                self._data['ID'] = hex(id & 0xFC)[2:]
+                self._data['init'] = bool(id & 1<<1)
+                self._data['T'] = (10 * ((data[0][1] & 0xF) - 4) + (data[0][2] >> 4) + (data[0][2] & 0xF) / 10.0, 'C')
+                rh = data[0][3] & 0x7F
+                if (rh > 0) and (rh <= 100):
+                        self._data['RH'] = (rh, '%')
+                self._data['batlo'] = bool(data[0][3] & 1<<7)
+                self._data['RSSI'] = data[1]
+                self._data['AFC'] = data[2]
+
+        def __str__(self):
+                res = 'La crosse ' + str(self._data)
+                return res; 
+
+        @staticmethod
+        def Create(data):
+                if (len(data[0]) < 5) or (crc8(data[0]) != 0):
+                    return
+                if (data[0][1] & 0x0F > 9) or (data[0][2] >> 4 > 9) or (data[0][2] & 0x0F > 9):
+                    return
+                return lacross(data)
+
+class emt7110(rawsensor):
+        def __init__(self, data):
+                rawsensor.__init__(self, data)
+                _data = data[0]
+                id = _data[0] << 24 | _data[1] << 16 | _data[2] << 8 | _data[3]
+                self._data['ID'] = hex(id)[2:]
+                self._data['P'] = (((_data[4] << 8 | _data[5]) & 0x3FFF) / 2.0, 'W')
+                self._data['U'] = (_data[8] / 2.0 + 128, 'V')
+                self._data['I'] = (_data[6] << 8 | _data[7], 'mA')
+                self._data['W'] = (((_data[9] << 8 | _data[10]) & 0x3FFF) / 100, 'kWh')
+
+        def __str__(self):
+                return 'emt7110 ' + str(self._data)
+
+        @staticmethod
+        def Create(data):
+                if len(data[0]) >= 12 and len(data[0]) <= 20 and csum(data[0]) == 0:
+                        return emt7110(data)