-- Calculating average cell voltage based on telemetry main battery
-- User will be voice prompted on low cell voltage
-- User can select Telemtry Source, Cell count, Trigger level, delay and Alarm Interval
-- by Adrian May 2020 free to reuse without any warrenty

-- SETUP Guide
------------------------------------------------------------------------------------
-- Load this Script to SCRIPT/MIXES on your SD Card
-- Select Script on LUA Script Screen on your Transmitter
-- Enter required values

local lasttime = 0	-- Saves timestamp to trigger alarm in intervals

-- Input selection on LUA Sript screen on Transmitter
local input = { 	
	{"Telemetry", SOURCE }, -- Select Telemetrie Source like RB1V
	{"Num of Cel", VALUE , 1, 14, 6 }, -- Cells from 1 to 14, default 6
	{"Volt Trig", VALUE , 29,40, 34}, -- Low Voltage Level 34 = 3.4V
	{"Interval", VALUE , 3 , 30, 5} -- Alarm Intervall in Seconds 5..30 default 10
}

-- Output on LUA screen
local output = {"vcel"}

 -- Calculating the average and announce it once it's below this Level
local function run(voltage, cell, trigger, interval) 
	
	-- for debugging and testing purpose in Companion, uncomment this, but comment it again later
	-- voltage = 20
	
	local avCel = voltage/cell*10 -- devide reported voltage by cell multiply by 10 to meet input range	
	if ((avCel > 20) and (avCel < trigger)) then -- if voltage bigger 20 and smaller than trigger
		local timenow = getTime() -- get actual time to and compare if interval exceeded
		if (getTime() - lasttime > (interval * 100)) then
			lasttime = getTime()  -- store time for next comparison
			playFile("SYSTEM/1048.wav")  -- Play File Cell Volatage, this is a system file
			playNumber(avCel, 1, PREC1)  -- Play voltage with Unit Voltage and 1 Decimal
		end
	end
	return avCel / 10 *10.24 -- lua leave devided by 1024 to represent percentage in mixer 
end
 
-- Return statement to run script
return { run=run, input=input, output=output }