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Per Westermark
12/10/11 13:21
Read: 404 times

#185065 - Cost - and what type of protection/detection
Responding to: Andy Neil's previous message
As noted, cost is relative here.

- Cost as in imported special components.
- Cost as in time to implement.
- Cost as in consuming extra processor resources to monitor the sensor.
- Cost as in special cabling needed.
- Cost as in more board space for sensor normalization.

Next thing is that different sensors have different use. There are several groups of problems to solve.
- shell protection. I.e. sensors for doors, windows, ...
- volume protection. Microphones, PIR-sensors, light beams, cameras, ...
- environmental protection. Smoke, temperature, moisture, ...
- object protection. Weight sensor, switches, capacitance, ...

One type of sensor not mentioned above is a oscillator design, where you basically measures capacitance or inductance - if a metal object is moved or a wet body (human) moves, then the resonance frequency changes.

These kind of sensors can be quite hard to fool and just like PIR sensors they can be used as volume sensors. But also as shell protection. Just putting your hand on a door handle can be detected (with or without glove on). Or the sensor electronics could be behind a painting and detect people walking in front of the painting.

List of 28 messages in thread
Freeze..thief protection      JecksonS Ben      12/10/11 07:27      
   Alarm Sensors      Joseph Hebert      12/10/11 11:06      
      Earth magnetic field sensor      Bert Van Den Berg      12/19/11 10:36      
         inexpensive solid state magnetic field      JecksonS Ben      12/20/11 01:36      
         It means..      JecksonS Ben      12/28/11 04:27      
            ???      Per Westermark      12/28/11 06:11      
               same      JecksonS Ben      12/31/11 04:12      
   Too vague!      Andy Neil      12/10/11 12:04      
      Cost - and what type of protection/detection      Per Westermark      12/10/11 13:21      
      How low is "low" cost?      Andy Neil      12/11/11 07:33      
         OK..great..maybe Links      JecksonS Ben      12/11/11 23:41      
            Still no idea what you actually want      Andy Neil      12/12/11 14:12      
      What exactly?      JecksonS Ben      12/12/11 23:53      
         Bounce        Per Westermark      12/13/11 00:59      
            OK      JecksonS Ben      12/14/11 00:32      
         If it's networked      Andy Neil      12/14/11 13:43      
            hard to handle      JecksonS Ben      12/15/11 01:19      
               Come on ... it requires a number        Richard Erlacher      12/15/11 08:42      
                  numbers      JecksonS Ben      12/16/11 01:02      
            cost and reliability        Joseph Hebert      12/16/11 06:36      
               cost      JecksonS Ben      12/17/11 03:44      
                  Does that mean you don't know what your price target it?      Richard Erlacher      12/17/11 08:57      
                  soft base      Joseph Hebert      12/17/11 10:11      
                     manufacture products      JecksonS Ben      12/18/11 03:07      
                        shock sensors        Joseph Hebert      12/18/11 16:17      
                           advice      JecksonS Ben      12/19/11 00:49      
                              Capacitive solutions can be projective      Per Westermark      12/19/11 01:00      
                                 metal..      JecksonS Ben      12/19/11 01:09      

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