Help with a Formula for Light Level based on Time

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Wob76
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Joined: Wednesday 19 April 2017 6:31
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Help with a Formula for Light Level based on Time

Post by Wob76 » Friday 15 June 2018 4:14

Hi,

Not even sure where to start on this one, so hoping some better scripters can help. Have have a number of motion activated lights, and currently I just have to manually work out levels based on time periods, what I would like to do is have a formula work out the level based on how many minutes before\after sunrise it is.

I don't want to create a wake up clock as such, I just want to light to turn on a X level when motion is detected.

For example, if I work in the bathroom 30min before sunrise, it is still dark, so if the light turns on at 100% it is blinding, so lets start with a base level of 40%, if I work in at 10min before sunrise then it could be brighter, lets say 80%?

I can play around with levels and timing later, but I would like to test just having it say go up 2% for every minute between 30min before sunrise and then sunrise?

Anyone got an idea how I can make a level formula based on a time?

Thanks,
Wob

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waaren
Posts: 910
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Re: Help with a Formula for Light Level based on Time

Post by waaren » Friday 15 June 2018 11:07

Please have a look at this function. If you want you can just delete the debug blocks but I left it in as that was a small puzzle in itself :D

Code: Select all

-- timeBasedBrightness.lua 

return {
        on      =   {   devices     = { "brightnessTrigger" }},        -- I use this button to activate script during development and testing
                
        logging =   {   level       =   domoticz.LOG_INFO,
                        marker      =   "timeBasedBrightness"    },

    execute = function(dz, _)

        local function calculateBrightnessNeeded(minutes)                             -- Call with parameter minutes only for testing
            
            local minBrightness        = 40 
            local maxBrightness        = 100 
            local t                    = dz.time
            
            local minutesSinceMidnight = minutes or (dz.utils.round(t.secondsSinceMidnight / 60))
            local endDayMinutes        = t.sunsetInMinutes
            local beginDayMinutes      = t.sunriseInMinutes
            

            --[[   This commented part is only needed when testing debugging
            local Time = require('Time')
            local Bhour = math.floor (minutes / 60)
            local Bmin  = minutes - Bhour * 60
            if tonumber(Bhour) == 0 then Bhour = "00" 
            elseif tonumber(Bhour) < 10 then Bhour = "0" .. tostring(Bhour) end

            if tonumber(Bmin) == 0 then Bmin = "00" 
            elseif tonumber(Bmin) < 10 then Bmin = "0" .. tostring(Bmin) end
            
            t = Time(t.rawDate .. " " .. Bhour .. ":" .. Bmin .. ":" .. "00")
            
            dz.log("Time: " .. t.raw .. " ===>  dayTime: " .. tostring(t.matchesRule("between sunrise and sunset")) ,dz.LOG_DEBUG)    
            ]] --            

            if t.matchesRule("between 30 minutes before sunrise and sunrise") then   -- Night / early morning
                return math.min(math.max(minBrightness,(maxBrightness - (beginDayMinutes - minutesSinceMidnight) * 2)), maxBrightness) end
            if t.matchesRule("between sunset and 30 minutes after sunset") then   -- Evening 
               return math.min(math.max(minBrightness,(minBrightness + (minutesSinceMidnight - endDayMinutes) * 2)), maxBrightness) end
            if t.matchesRule("between sunrise and sunset") then -- Daytime
                return maxBrightness end  
           
            return minBrightness -- Nighttime
        end
        
        --[[ testSet only valid on June 15th 2018; expected outcome will vary based on sunset / sunrise times
        dz.log("time 2:00   ===>> Brightness expected: 40 ; Brightness from function: " .. calculateBrightnessNeeded(120) ,dz.LOG_DEBUG) -- 2:00 ===>> 40
        dz.log("time 10:00  ===>> Brightness expected: 100; Brightness from function: " .. calculateBrightnessNeeded(600) ,dz.LOG_DEBUG) -- 10:00  ===>> 100
        dz.log("time 5:05   ===>> Brightness expected: 66; Brightness from function: " ..  calculateBrightnessNeeded(305) ,dz.LOG_DEBUG)  -- 5:05   ===>> 66
        dz.log("time 5:21   ===>> Brightness expected: 98; Brightness from function: " ..  calculateBrightnessNeeded(321) ,dz.LOG_DEBUG)  -- 5:21   ===>> 98
        dz.log("time 22:03  ===>> Brightness expected: 40; Brightness from function: " ..  calculateBrightnessNeeded(1323),dz.LOG_DEBUG)  -- 22:03  ===>> 40
        dz.log("time 22:30  ===>> Brightness expected: 94; Brightness from function: " ..  calculateBrightnessNeeded(1350),dz.LOG_DEBUG)  -- 22:30  ===>> 94
        dz.log("time 21:45  ===>> Brightness expected: 100; Brightness from function: " .. calculateBrightnessNeeded(1305),dz.LOG_DEBUG) -- 21:45  ===>> 100
        dz.log("time 17:00  ===>> Brightness expected: 100; Brightness from function: " .. calculateBrightnessNeeded(1020),dz.LOG_DEBUG) -- 17:00  ===>> 100
        dz.log("time 13:00  ===>> Brightness expected: 100; Brightness from function: " .. calculateBrightnessNeeded(780) ,dz.LOG_DEBUG) -- 13:00  ===>> 100
        dz.log("time 12:59  ===>> Brightness expected: 100; Brightness from function: " .. calculateBrightnessNeeded(779) ,dz.LOG_DEBUG) -- 12:59  ===>> 100
        dz.log("time 00:00  ===>> Brightness expected: 40; Brightness from function: " ..  calculateBrightnessNeeded(0)   ,dz.LOG_DEBUG)  -- 00:00  ===>> 40
        ]]--
        
        dz.log("date/time: " .. dz.time.raw .. "; Brightness should now be set at: " .. calculateBrightnessNeeded() .. "%",dz.LOG_INFO)
        
    end
}
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Wob76
Posts: 129
Joined: Wednesday 19 April 2017 6:31
Target OS: Linux
Domoticz version:
Contact:

Re: Help with a Formula for Light Level based on Time

Post by Wob76 » Friday 15 June 2018 15:59

That looks seriously awesome, thanks so much for taking the time. I'm very interested to have a look at your test code.

Your stuff always look so neat and compact. I've not got around to learning all the shorthand.

Wob

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Wob76
Posts: 129
Joined: Wednesday 19 April 2017 6:31
Target OS: Linux
Domoticz version:
Contact:

Re: Help with a Formula for Light Level based on Time

Post by Wob76 » Friday 06 July 2018 1:36

@waaren A bit delayed, but I just wanted to say thanks, tweaked the formula and the timing to suit a couple of rooms and it has been working great.

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