107 lines
3.4 KiB
Python
107 lines
3.4 KiB
Python
"""
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Support for Modbus Register sensors.
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For more details about this platform, please refer to the documentation at
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https://home-assistant.io/components/sensor.modbus/
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"""
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import logging
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import voluptuous as vol
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import homeassistant.components.modbus as modbus
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from homeassistant.const import (
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CONF_NAME, CONF_OFFSET, CONF_UNIT_OF_MEASUREMENT)
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from homeassistant.helpers.entity import Entity
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from homeassistant.helpers import config_validation as cv
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from homeassistant.components.sensor import PLATFORM_SCHEMA
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_LOGGER = logging.getLogger(__name__)
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DEPENDENCIES = ['modbus']
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CONF_COUNT = "count"
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CONF_PRECISION = "precision"
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CONF_REGISTER = "register"
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CONF_REGISTERS = "registers"
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CONF_SCALE = "scale"
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CONF_SLAVE = "slave"
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PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
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vol.Required(CONF_REGISTERS): [{
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vol.Required(CONF_NAME): cv.string,
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vol.Required(CONF_REGISTER): cv.positive_int,
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vol.Optional(CONF_COUNT, default=1): cv.positive_int,
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vol.Optional(CONF_OFFSET, default=0): vol.Coerce(float),
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vol.Optional(CONF_PRECISION, default=0): cv.positive_int,
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vol.Optional(CONF_SCALE, default=1): vol.Coerce(float),
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vol.Optional(CONF_SLAVE): cv.positive_int,
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vol.Optional(CONF_UNIT_OF_MEASUREMENT): cv.string
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}]
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})
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def setup_platform(hass, config, add_devices, discovery_info=None):
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"""Setup Modbus sensors."""
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sensors = []
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for register in config.get(CONF_REGISTERS):
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sensors.append(ModbusRegisterSensor(
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register.get(CONF_NAME),
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register.get(CONF_SLAVE),
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register.get(CONF_REGISTER),
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register.get(CONF_UNIT_OF_MEASUREMENT),
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register.get(CONF_COUNT),
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register.get(CONF_SCALE),
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register.get(CONF_OFFSET),
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register.get(CONF_PRECISION)))
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add_devices(sensors)
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class ModbusRegisterSensor(Entity):
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"""Modbus resgister sensor."""
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# pylint: disable=too-many-instance-attributes, too-many-arguments
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def __init__(self, name, slave, register, unit_of_measurement, count,
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scale, offset, precision):
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"""Initialize the modbus register sensor."""
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self._name = name
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self._slave = int(slave) if slave else None
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self._register = int(register)
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self._unit_of_measurement = unit_of_measurement
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self._count = int(count)
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self._scale = scale
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self._offset = offset
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self._precision = precision
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self._value = None
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@property
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def state(self):
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"""Return the state of the sensor."""
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return self._value
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@property
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def name(self):
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"""Return the name of the sensor."""
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return self._name
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@property
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def unit_of_measurement(self):
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"""Return the unit of measurement."""
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return self._unit_of_measurement
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def update(self):
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"""Update the state of the sensor."""
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result = modbus.HUB.read_holding_registers(
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self._slave,
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self._register,
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self._count)
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val = 0
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if not result:
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_LOGGER.error(
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'No response from modbus slave %s register %s',
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self._slave,
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self._register)
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return
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for i, res in enumerate(result.registers):
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val += res * (2**(i*16))
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self._value = format(
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self._scale * val + self._offset,
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".{}f".format(self._precision))
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