Elektronica Stynus
 

Stand-by killer

I have a nas that I shut down when I go to sleep. But I noticed that it was still drawing a lot off power even in standby so I decided to build a stand-by killer. If this circuit detects that the nas draws less then a preset power then it shuts the output off. To eliminate measuring faults it checks during 5 seconds, if the power is low enougt during these 5 seconds then it will shut down.

 

Circuit:Stanby killer schema

 

Pcb layout:

Stanby killer print

print

 

I did not like that the 220 Ohm resistor in the power supply got so hot and that there was lost to much power there. So I replaced the old power supply with a small transformer.

ingebouwd

 

The box mounted and connected:

standby killer

nas

 

The code in the pic:

Device 12F629               
Config INTRC_OSC_NOCLKOUT, WDT_OFF, PWRTE_ON, BODEN_OFF, MCLRE_OFF     
ALL_DIGITAL TRUE   

Symbol  GPIF        = INTCON.0
Symbol  GPIE        = INTCON.3

Symbol  GIE         = INTCON.7

Symbol  stroom      = GPIO.5                
Symbol  druk        = GPIO.3  
Symbol  ssr         = GPIO.2 
Symbol  LED1        = GPIO.1  

Symbol  LED2        = GPIO.0

Dim     index       As Byte

;         76543210
GPIO   = %00000000   
TRISIO = %11111000         
IOC    = %00101000        
GIE    = 0         ;Global Interrupt Enable uitschakelen(!)
GPIE   = 1         ;GPIO Port change Interrupt Enable inschakelen
 

Clear        

begin:
While 1 = 1
    GPIF = 0 
    Sleep
    If druk = 0 Then
        GoTo aan
    EndIf
Wend


aan:
While 1 = 1
    High ssr
    High LED2
    GPIF = 0
    Sleep   
    If stroom = 0 Then
        GoTo uit
    EndIf
    If druk = 0 Then
        GoTo af
    EndIf
Wend


uit:

While 1 = 1
    LED1 = 0
    For index = 0 To 5
        Toggle LED1
        DelayMS 500
        If stroom = 1 Then 
            LED1 = 0
            GoTo aan
        EndIf 
    Next
    Low ssr
    Low LED2
    GoTo begin


Wend

af:
While 1 = 1
    LED1 = 0
    For index = 0 To 5
        Toggle LED1
        DelayMS 500
        If druk = 1 Then 
            LED1 = 0
            GoTo aan
        EndIf 
    Next
    Low ssr
    Low LED2
    While druk = 0: Wend
    DelayMS 2000
    GoTo begin


Wend

End

Top

Comments

comments powered by Disqus

Top

© 2002-2017 Elektronica Stynus.
Valid XHTML 1.0