Daily auto-resetting but manual countdown timer...

[Geir Holmavatn]

Hi,

I need a timer for switching mains on and off. There should be On and
Off buttons to manually control the mains connection and battery backup
for the time-of-day clock.

The timer should have a programmable 'allowed to connect' timeframe, say
from 9am to 12am and within that timeframe a programmable daily
'accumulated 'on time' of say 2 hours. Users may switch the timer's on
and off buttons multiple times, but the total connected time should
never exceed the max accumulated daily 'on' time.

The 'On' button should not work if pressed outside the allowed timeframe
and the timer should switch mains off when being connected for an
accumulated total of say 2 hours or when the allowed timeframe ends,
whichever occurs first.

Has anyone here seen a programmable timer capable of such tasks...?

Thanks for any tips and comments

regards

Geir

 

[Jamie]

Hi,

I need a timer for switching mains on and off. There should be On and
Off buttons to manually control the mains connection and battery backup
for the time-of-day clock.

The timer should have a programmable 'allowed to connect' timeframe, say
from 9am to 12am and within that timeframe a programmable daily
'accumulated 'on time' of say 2 hours. Users may switch the timer's on
and off buttons multiple times, but the total connected time should
never exceed the max accumulated daily 'on' time.

The 'On' button should not work if pressed outside the allowed timeframe
and the timer should switch mains off when being connected for an
accumulated total of say 2 hours or when the allowed timeframe ends,
whichever occurs first.

Has anyone here seen a programmable timer capable of such tasks...?

Thanks for any tips and comments

regards

Geir

Use this timer for the event scheduling.
http://www.ia.omron.com/data_pdf/data_sheet/h5f_dsheet_csm101.pdf

Look there to start with...

Then you need a count down timer that gets enabled from both the
schedule timer and the Control circuit when activated. The count down
timer hits the preset. It'll simply not provide the voltage for the
push button control circuit and thus kill the circuit..