bandaangosta/pzem_004t.py

## pzem_004t.py
# Reading PZEM-004t power sensor (new version v3.0) through Modbus-RTU protocol over TTL UART
# Run as:
# python3 pzem_004t.py

# To install dependencies:
# pip install modbus-tk
# pip install pyserial

import serial
import modbus_tk.defines as cst
from modbus_tk import modbus_rtu

# Connect to the sensor
sensor = serial.Serial(
    port='/dev/PZEM_sensor',
    baudrate=9600,
    bytesize=8,
    parity='N',
    stopbits=1,
    xonxoff=0
)

master = modbus_rtu.RtuMaster(sensor)
master.set_timeout(2.0)
master.set_verbose(True)

data = master.execute(1, cst.READ_INPUT_REGISTERS, 0, 10)

voltage = data[0] / 10.0 # [V]
current = (data[1] + (data[2] << 16)) / 1000.0 # [A]
power = (data[3] + (data[4] << 16)) / 10.0 # [W]
energy = data[5] + (data[6] << 16) # [Wh]
frequency = data[7] / 10.0 # [Hz]
powerFactor = data[8] / 100.0
alarm = data[9] # 0 = no alarm

print('Voltage [V]: ', voltage)
print('Current [A]: ', current)
print('Power [W]: ', power) # active power (V * I * power factor)
print('Energy [Wh]: ', energy)
print('Frequency [Hz]: ', frequency)
print('Power factor []: ', powerFactor)
print('Alarm : ', alarm)

# Changing power alarm value to 100 W
# master.execute(1, cst.WRITE_SINGLE_REGISTER, 1, output_value=100)

try:
    master.close()
    if sensor.is_open:
        sensor.close()
except:
    pass
	# Reading PZEM-004t power sensor (new version v3.0) through Modbus-RTU protocol over TTL UART
	# Run as:
	# python3 pzem_004t.py

	# To install dependencies:
	# pip install modbus-tk
	# pip install pyserial

	import serial
	import modbus_tk.defines as cst
	from modbus_tk import modbus_rtu

	# Connect to the sensor
	sensor = serial.Serial(
	port='/dev/PZEM_sensor',
	baudrate=9600,
	bytesize=8,
	parity='N',
	stopbits=1,
	xonxoff=0
	)

	master = modbus_rtu.RtuMaster(sensor)
	master.set_timeout(2.0)
	master.set_verbose(True)

	data = master.execute(1, cst.READ_INPUT_REGISTERS, 0, 10)

	voltage = data[0] / 10.0 # [V]
	current = (data[1] + (data[2] << 16)) / 1000.0 # [A]
	power = (data[3] + (data[4] << 16)) / 10.0 # [W]
	energy = data[5] + (data[6] << 16) # [Wh]
	frequency = data[7] / 10.0 # [Hz]
	powerFactor = data[8] / 100.0
	alarm = data[9] # 0 = no alarm

	print('Voltage [V]: ', voltage)
	print('Current [A]: ', current)
	print('Power [W]: ', power) # active power (V * I * power factor)
	print('Energy [Wh]: ', energy)
	print('Frequency [Hz]: ', frequency)
	print('Power factor []: ', powerFactor)
	print('Alarm : ', alarm)

	# Changing power alarm value to 100 W
	# master.execute(1, cst.WRITE_SINGLE_REGISTER, 1, output_value=100)

	try:
	master.close()
	if sensor.is_open:
	sensor.close()
	except:
	pass