Power Button in lua script

[Europa284]

Hey there, a question for you lua programing gurus. I have a friend that wants a timer to know haw long the tx battery has been on. I have a widget made that times whenever the radio is on. I have it saving to a file so it can be loaded into all models and start with the previous value saved. The problem is I dont want it writing to the file continously and wear out the sd card. I have it writing once a minute but it can loose up to a minute each time it is shutdown. Is there any way to trigger something like a function as it is shutdown? I can't seem to be able to find a way.
Is there a way to trigger on button press in lua?
Thanks.

[schnupperm]

Hello,
five years ago I had the same problem while developing a similar widget.
My solution was to update the file only every 10 minutes.
For the time the radio is running I (mis)used the getGlobalTimer() function.

Here is the code:

`-- BatTimer: shows battery voltage and time since last charge
-- Frank Zeroch
-- Date: 2025
-- ver: 0.2

local txVoltId
local batFileName = "/WIDGETS/BATTIMER.DAT"
local debugFileName = "/WIDGETS/BATTIMER.DEB"
local voltageChecked = 0
local checkTime
local debugout = 0

local function checkVoltage (aktbatv)

local oldbatv = aktbatv
local batfile = io.open(batFileName, "r")

if batfile ~= nil then
oldbatv = tonumber(io.read(batfile, 4)) + 0
io.close (batfile)
if aktbatv - 0.2 > oldbatv then
resetGlobalTimer()
if (debugout > 0) then
local debugfile = io.open(debugFileName,"a")
if (debugfile ~= nil) then
io.write(debugfile, string.format("time: %d min., RTC: %d sec.\r\n", getTime()/6000, getRtcTime()))
io.write(debugfile, string.format("oldbatv: %.1f, aktbatv: %.1f\r\n\r\n", oldbatv, aktbatv))
io.close(debugfile)
end
end
end
end

batfile = io.open (batFileName, "w");
if batfile ~= nil then
io.write (batfile, string.format("%.1f" ,aktbatv))
io.close (batfile)
end
-- print ("aktbatv: " .. aktbatv .. "\r\n")
end

local options = {
{ "TextColor", COLOR, BLACK }
}

local function create(zone, options)
local wgt = { zone=zone, options=options}
txVoltId = getFieldInfo('tx-voltage').id
return wgt
end

local function update(wgt, options)
if (wgt == nil) then return end
wgt.options = options
end

local function background(wgt)
return
end

-- Zone size: top bar widgets
local function refreshZoneTiny(wgt, batInfo, timeInfo)
lcd.drawText(wgt.zone.x, wgt.zone.y, timeInfo, SMLSIZE+CUSTOM_COLOR)
lcd.drawText(wgt.zone.x, wgt.zone.y+14, batInfo , MIDSIZE+CUSTOM_COLOR)
end

--- Zone size: 160x32 1/8th
local function refreshZoneSmall(wgt, batInfo, timeInfo)
lcd.drawText(wgt.zone.x, wgt.zone.y, timeInfo, CUSTOM_COLOR)
lcd.drawText(wgt.zone.x+100, wgt.zone.y, batInfo , CUSTOM_COLOR)
end

--- Zone size: 180x70 1/4th
local function refreshZoneMedium(wgt, batInfo, timeInfo)
lcd.drawText(wgt.zone.x, wgt.zone.y, timeInfo, MIDSIZE+CUSTOM_COLOR)
lcd.drawText(wgt.zone.x, wgt.zone.y+30, batInfo , DBLSIZE+CUSTOM_COLOR)
end

local function refresh(wgt)

if (wgt==nil) then
print("refresh(nil)")
return
end

if (wgt.options==nil) then
print("refresh(wgt.options=nil)")
return
end

lcd.setColor(CUSTOM_COLOR, wgt.options.TextColor)

local t1 = getGlobalTimer()
local batv = tonumber(getValue(txVoltId))
local batInfo = string.format("%.1f V", batv)
local timeInfo = string.format("Batt %02d:%02d", t1.total/3600, (t1.total/60)%60)

if batv > 5 and voltageChecked == 0 then
checkVoltage(batv)
voltageChecked = 1
checkTime = t1.total
end

if t1.total % 600 == 0 and t1.total ~= checkTime and t1.total ~= 0 then voltageChecked = 0 end -- check every 10 min.

if wgt.zone.w > 170 and wgt.zone.h > 65 then refreshZoneMedium(wgt, batInfo, timeInfo)
elseif wgt.zone.w > 150 and wgt.zone.h > 28 then refreshZoneSmall(wgt, batInfo, timeInfo)
elseif wgt.zone.w > 65 and wgt.zone.h > 35 then refreshZoneTiny(wgt, batInfo, timeInfo)
end
end

return { name="BatTimer", options=options, create=create, update=update, background=background, refresh=refresh }
`

[Europa284]

I found that there is a battery timer already in the statistics page and has a reset. All that work and searching for nothing. haha

[schnupperm]

No and Yes,
I want that the timer resets automatically, if the Battery was charged. (My old MC-19 did this)
So I need to remember the battery voltage to see if it has risen since the last powerdown.