This page allows you to compute how long a sensor will work powered by an energetic source, normally a
battery. This is no rocket science, only a tool providing a useful approximation.

Cette page vous permet de calculer approximativement pendant combien de temps un senseur, alimenté
par une batterie, va fonctionner.

Values for common batteries: Normal: 500 [mA hour]  
  Lithium: 1000 [mA hour]  
     
Values for efficiency factor: if a 9V battery is used as 5V --> alpha=0.8  


 
Battery
 
 
Voltage
Current
  
 
[V]  
[mA hour]   
 
         
  Efficiency factor    
[-]   
   
  Sensor      
 
Voltage
Current
  
 
[V]  
[A hour]   
 
         
         
  The battery provides:   0.000 [Wh]  
  The sensor needs:   0.000 [W]  
 
Time you can use the sensor:
  0.000 [h]     0.000 [min]  


To be on the safe side, devide the time obtained by a factor 2 :-)
If you have several sensors and/or batteries, only add the different terms [consumption and/or alimentation]




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