Domoticz

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return {
	on = {
		timer = {'every minute'},

	},


    logging =   {   level                   = domoticz.LOG_DEBUG,
                    marker                  = "Object test" },



	execute = function(dz, triggeredItem)

    local function Functions()
        fn = require("Functions")
    end

    if pcall(Functions) then
        dz.log("Functions loaded",dz.LOG_DEBUG)
    else
        local status, err = pcall(Functions)
        dz.log("\n\n ********   Error  ********* \n\n       " .. err .. "\n\n" , dz.LOG_ERROR)               -- No Functions -->> we quit

        dz.log("Required functions (file) unusable or not present", dz.LOG_ERROR)                                   -- No usersettting file So we quit
        dz.log("Vereiste functies kunnen niet worden geladen. Verwerking stopt.", dz.LOG_ERROR)      -- No usersettting file So we quit
        return
    end
    
    local set = 20
    local diff = 18
    local output = fn.PID(set, diff)
    dz.log('PID output : ' .. output)


	end
}

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local self = { }

function round(n)
      return n % 1 >= 0.5 and math.ceil(n) or math.floor(n)
end

function self.PID(setpoint, avg_Temp)
        local Ki = 10
        local Kp = 13,6
        local Kd = 1000
        local dt = 60            
        local error = setpoint - avg_Temp
        local output = (Kp*error+22) 
        return output
end

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 2019-10-13 20:44:00.891 Status: dzVents: Info: Object test: ------ Start internal script: test:, trigger: every minute
2019-10-13 20:44:00.891 Status: dzVents: Debug: Object test: Functions loaded
2019-10-13 20:44:00.892 Status: dzVents: Info: Object test: ------ Finished test
2019-10-13 20:44:00.891 Error: dzVents: Error: (2.4.29) Object test: An error occurred when calling event handler test
2019-10-13 20:44:00.891 Error: dzVents: Error: (2.4.29) Object test: ...e/pi/domoticz/scripts/dzVents/generated_scripts/test.lua:37: attempt to index global 'fn' (a boolean value) 

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return self