Tibber/PZEM004.py at main · rocus/Tibber · GitHub

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from utime import sleep
import ustruct as struct


def calculate_crc(data):
    CRC16table = (
        0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
        0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
        0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
        0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
        0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
        0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
        0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
        0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
        0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
        0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
        0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
        0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
        0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
        0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
        0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
        0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
        0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
        0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
        0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
        0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
        0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
        0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
        0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,
        0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,
        0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,
        0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,
        0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,
        0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,
        0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,
        0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,
        0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
        0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040
    )
    crc = 0xFFFF
    for c in data:
        crc = (crc >> 8) ^ CRC16table[((c) ^ crc) & 0xFF]
    return crc


class PZEM:
    queryBytes = [0x01, 0x04, 0x00, 0x00, 0x00, 0x0A, 0x70, 0x0D]

    def __init__(self, uart):
        self.ser = uart

    def checkCRC(self, _tuple):
        crc = calculate_crc(_tuple[0:23])
        return crc == ((_tuple[24] << 8) + _tuple[23])

    def ReadAllData(self):
        #   previous d = dict() that gives keyerrors when not powered.
        d = {"Voltage":0.0, "Current":0.0, "Power":0.0, "Energy":0, "Freq":0.0, "Pwr_fac":0.0}
        self.ser.write(bytes(self.queryBytes))
        sleep(1)
        rcv = self.ser.read(25)
        if rcv is None:   # used to be rcv == None
            print("Nothing received")
        elif len(rcv) == 25:
            unpacked = struct.unpack("!25B", rcv)
            if (self.checkCRC(unpacked)):
                d["Voltage"] = ( (unpacked[ 3] << 8) + unpacked[ 4]) / 10.0
                d["Current"] = (((unpacked[ 5] << 8) + unpacked[ 6]) + (((unpacked[ 7] << 8) + unpacked[ 8]) << 8) ) / 1000
                d["Power"  ] = (((unpacked[ 9] << 8) + unpacked[10]) + (((unpacked[11] << 8) + unpacked[12]) << 8) ) / 10
                d["Energy" ] = (((unpacked[13] << 8) + unpacked[14]) + (((unpacked[15] << 8) + unpacked[16]) << 8) )
                d["Freq"   ] = ( (unpacked[17] << 8) + unpacked[18]) / 10.0
                d["Pwr_fac"] = ( (unpacked[19] << 8) + unpacked[20]) / 100.0
                d["Alarm"  ] = str(unpacked[21]) + " " + str(unpacked[22])
                d["CRC"    ] = str(unpacked[23]) + " " + str(unpacked[24])
            else:
                print("CRC wrong")
        else:
            print("Length wrong")
        return d

    def close(self):
        self.ser.deinit()