This door timer is usefull to alert when door is opened.
A programmable timer will send short beep within allowable period of open door. When this period has elapsed, a continuous beep will alert user to close the door. If the door is still not closed, then an alarm will be activated.
This alarm can only be cleared by pressing reset button (or key).
Here is the schematic :
D3 is 5V zener diode for supplying the ATtiny2313.
SW1 is DIP switch to select how long the shor beep interval before continuous beep.
Alarm is connected into relay's output.
Here is the layout :
The source code for AVR is available here
And the Eagle Schematics and Board file : Schematics PCB
A programmable timer will send short beep within allowable period of open door. When this period has elapsed, a continuous beep will alert user to close the door. If the door is still not closed, then an alarm will be activated.
This alarm can only be cleared by pressing reset button (or key).
Here is the schematic :
D3 is 5V zener diode for supplying the ATtiny2313.
SW1 is DIP switch to select how long the shor beep interval before continuous beep.
Alarm is connected into relay's output.
Here is the layout :
The source code for AVR is available here
And the Eagle Schematics and Board file : Schematics PCB
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