Kamer verwarmen met een boiler

Gestart door Joost, 27 oktober 2019, 07:40:25

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Joost


-- 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 = 'Boiler' -- switch device
local SETPOINT_DEVICE = 'Setpoint' -- selector dummy device
local TEMPERATURE_SENSOR = 'Temperature'
local HYSTERESIS = 0.5 -- temp has to drop this value below setpoint before boiler is on again
local SMOOTH_FACTOR = 3
local LOGGING = true

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

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 (item.isDevice) 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 ' .. item.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
}