Check if value changed [Solved]

[Jumper3126]

the lastupdate feature of DZventz is enormously handy, but for a new script I would like to know when a device (integer value) has changed. This specific devices is updated every minute but also if the value didn't change. Is this possible somehow or do i need to work with persistent data to store and compare?

[waaren]

the lastupdate feature of DZventz is enormously handy, but for a new script I would like to know when a device (integer value) has changed. This specific devices is updated every minute but also if the value didn't change. Is this possible somehow or do i need to work with persistent data to store and compare?

Yes you need to work with persistent data or a domoticz uservariable to compare current state with a previous state if your device is not a dimmer or selector. For these types you can use the lastLevel attribute.

[Jumper3126]

Thanks for that very quick respons waaren!

[Patricen]

Hello,
This looks like it could solve my issue. I would like to trigger an event on sudden dewpoint rise. Do you have any example showing this?
using my algorithmic language it would look like
If sensor above stove's dewpoint rose more than 1°C since last update
Set cooker hood to "on"
Thanks

[waaren]

This looks like it could solve my issue. I would like to trigger an event on sudden dewpoint rise. Do you have any example showing this?

Something like below ?

Code: Select all

return 
{
    on =
    {
        devices = 
        {
            'myDewpointSensor', -- change to name of Sensor
        },
    },
    
    data =
    {
        lastValue =
        {
            initial = 0,
        },
    },

    logging = 
    {
        level = domoticz.LOG_DEBUG, -- change to domoticz.LOG_ERROR when script is tested and OK
        marker = 'dewPoint-rise',
    },

    execute = function(dz, item)
        cookerHood = dz.devices('cooker hood') -- change to name of Cooker Hood device
        
        dz.log('\nDevicename: ' .. item.name .. ', nValue: ' .. item.nValue .. ', sValue: ' .. item.sValue .. 
               '\nDevicetype: ' .. item.deviceType .. ', deviceSubType: ' .. item.deviceSubType .. 
               '\nlastValue: ' .. dz.data.lastValue, dz.LOG_DEBUG )

        if item.dewPoint >=  dz.data.lastValue + 1 then     
            cookerHood.switchOn().checkFirst()
        end
        if dz.data.lastValue ~= item.dewPoint then
            dz.data.lastValue = item.dewPoint
        end
    end
}

[Patricen]

Thanks a lot, I'll try this and keep you updated

[Patricen]

This looks like it could solve my issue. I would like to trigger an event on sudden dewpoint rise. Do you have any example showing this?

Something like below ?

Code: Select all

return 
{
    on =
    {
        devices = 
        {
            'myDewpointSensor', -- change to name of Sensor
        },
    },
    
    data =
    {
        lastValue =
        {
            initial = 0,
        },
    },

    logging = 
    {
        level = domoticz.LOG_DEBUG, -- change to domoticz.LOG_ERROR when script is tested and OK
        marker = 'dewPoint-rise',
    },

    execute = function(dz, item)
        cookerHood = dz.devices('cooker hood') -- change to name of Cooker Hood device
        
        dz.log('\nDevicename: ' .. item.name .. ', nValue: ' .. item.nValue .. ', sValue: ' .. item.sValue .. 
               '\nDevicetype: ' .. item.deviceType .. ', deviceSubType: ' .. item.deviceSubType .. 
               '\nlastValue: ' .. dz.data.lastValue, dz.LOG_DEBUG )

        if item.dewPoint >=  dz.data.lastValue + 1 then     
            cookerHood.switchOn().checkFirst()
        end
        if dz.data.lastValue ~= item.dewPoint then
            dz.data.lastValue = item.dewPoint
        end
    end
}

Waahh!! Brilliant, this works like a charm, thanks!