Domoticz

jkimmel wrote: Monday 09 March 2020 18:25 I'm running scripts to control my heating system.
How to trigger the script only when the value of the sensor has changed?

local TEMPERATURE_SENSOR = 130
local SETPOINT_DEVICE = 131

return
{
    on = 
    {
        devices = 
        {
            TEMPERATURE_SENSOR,
            SETPOINT_DEVICE,
        },
    },

    logging =   
    {
        level = domoticz.LOG_DEBUG, -- set to LOG_ERROR when tested and OK
        marker = 'setSetpoint', 
    },

    data = 
    {
        myHistory = 
        { 
            initial = {},
        },
    },

    execute = function(dz, item)
        if dz.data.myHistory[item.name] ~= nil and dz.data.myHistory[item.name].nValue == item.nValue and dz.data.myHistory[item.name].sValue == item.sValue then
            dz.log('no action required',dz.LOG_DEBUG)
            return
        end
        dz.data.myHistory[item.name] = {}
        dz.data.myHistory[item.name].nValue = item.nValue 
        dz.data.myHistory[item.name].sValue = item.sValue
        
        -- Rest of script
        dz.log('Action required',dz.LOG_DEBUG)
    end
}

jkimmel wrote: Tuesday 10 March 2020 11:14 I'm using dannybloe's script for heating control, merely by copy and paste and not always understanding how it may work.
Now thinking of reducing triggering the scripts and getting your response I looked again into my script.

Do I miss something?

changed: Boolean. True if the device was updated. Note: This does not necessarily means the device state or value changed.

Spoiler: show

Code: Select all

-- assumptions:
-- the setpoint is set by a selector dummy device where the values are numeric temperatures
-- but you can easily change it to a setpoint device

local BOILER_DEVICE = 'FB 21 Heizkreis Salon' -- switch device
local SETPOINT_DEVICE = 'Solltemperatur Salon' -- selector dummy device
local TEMPERATURE_SENSOR = 'Salon Temperatur'
local CHANGE_DEVICE = 'Modus Waermepumpe' -- selector dummy device
local HYSTERESIS = 0.5 -- temp has to drop this value below setpoint before boiler is on again
local HEATPUMP_RETURN = 'WP Ruecklauf' -- controls dewpoint of walls
local SMOOTH_FACTOR = 3
local LOGGING = true

return {
	on = {
		['timer'] = {
			'every 10 minutes',
		},
		devices = {
			TEMPERATURE_SENSOR,
			SETPOINT_DEVICE
		}
	},
	data = {
		temperatureReadings = { history = true, maxItems = SMOOTH_FACTOR }
	},
	active = true,
	execute = function(domoticz, device, triggerInfo)

		local avgTemp
		local temperatureReadings = domoticz.data.temperatureReadings
		local sensor = domoticz.devices(TEMPERATURE_SENSOR)
		local current = sensor.temperature
		local boiler = domoticz.devices(BOILER_DEVICE)
		local setpoint = domoticz.devices(SETPOINT_DEVICE)

		-- first check if the sensor got a new reading or the setpoint was changed:
		if (triggerInfo.type == domoticz.EVENT_TYPE_DEVICE) then

			if (sensor.changed) then
				-- sensor just reported a new reading
				-- add it to the readings table

				if (current ~= 0 and current ~= nil) then
					temperatureReadings.add(current)
				else
					-- no need to be here, weird state detected
					domoticz.log('Strange sensor reading.. skiping', domoticz.LOG_ERROR)
					return
				end

			elseif (domoticz.devices(SETPOINT_DEVICE).changed) then
				-- a new setpoint was set
				if LOGGING then domoticz.log('Setpoint was set to ' .. device.state) end
			else
				-- no business here, bail out...
				return
			end
		end

		-- now determine what to do
		if (setpoint.state == nil or setpoint.state == 'Off') then
			boiler.switchOff()
			return -- we're done here
		end

		local setpointValue = tonumber(setpoint.state)

		-- determine at which temperature the boiler should be
		-- switched on
		local switchOnTemp = setpointValue - HYSTERESIS

		-- don't use the current reading but average it out over
		-- the past <SMOOTH_FACTOR> readings (data smoothing) to get rid of noise, wrong readings etc
		local avgTemp = temperatureReadings.avg(1, SMOOTH_FACTOR, current) -- fallback to current when history is empty

		if LOGGING then
			domoticz.log('Average: ' .. avgTemp, domoticz.LOG_INFO)
			domoticz.log('Setpoint: ' .. setpointValue, domoticz.LOG_INFO)
			domoticz.log('Current boiler state: ' .. boiler.state, domoticz.LOG_INFO)
			domoticz.log('Switch-on temperature: ' .. switchOnTemp, domoticz.LOG_INFO)
		end

		if (avgTemp >= setpointValue and boiler.state == 'On') then
			if LOGGING then domoticz.log('Target temperature reached, boiler off') end
			boiler.switchOff()
		end

		if (avgTemp < setpointValue and boiler.state == 'Off') then
			if (avgTemp < switchOnTemp) then
				if LOGGING then domoticz.log('Heating is required, boiler switched on') end
				boiler.switchOn()
			else
				if LOGGING then domoticz.log('Average temperature below setpoint but within hysteresis range, waiting for temperature to drop to ' .. switchOnTemp) end
			end
		end
	end
}

jkimmel wrote: Tuesday 10 March 2020 15:50 Thank you for your fast response. Here my complete script: