hi all
my aim achieve reliable sensing when hand approaches metal light switch. (i.e. before touches surface)
i'd happy if sensor worked if human body parts put within 30cm, 2-5cm do. getting reliability (repeatability) when increasing distance can tricky , i'm looking tips.
i've implemented capacitive touch sensing using capsense library , couple of hook wires. didn't use foil, rather "blank" 0.7mm brushed steel faceplate (this metal lightswitch, without buttons). blanking plate has earthing connector comes in handy securing wire plate.
the capacitivesensor library page claims "the sensor start sense hand or body inches away sensor", said it's basing on using piece of foil haven't yet tried. i'm able work senses within mm, not in order of 5+cm.
i tried touch switch ic hobbytronics requires large resistor (3mohm in case). works except when power arduino down again, doesn't work until remove , re-add resistor, or dial or down resistance pot. if set sensitively, works while, randomly 1 day might stay triggered when move other side of room...
i hit ebay solutions, there e.g. 12 channel capacitive sensors pads built-in, , want use own faceplate.
can help?
1/ tips on above?
2/ know resistance variable, how surface material, thickness, , surface area affect reliability , / or possibility of triggering switch longer range?
my aim achieve reliable sensing when hand approaches metal light switch. (i.e. before touches surface)
i'd happy if sensor worked if human body parts put within 30cm, 2-5cm do. getting reliability (repeatability) when increasing distance can tricky , i'm looking tips.
i've implemented capacitive touch sensing using capsense library , couple of hook wires. didn't use foil, rather "blank" 0.7mm brushed steel faceplate (this metal lightswitch, without buttons). blanking plate has earthing connector comes in handy securing wire plate.
the capacitivesensor library page claims "the sensor start sense hand or body inches away sensor", said it's basing on using piece of foil haven't yet tried. i'm able work senses within mm, not in order of 5+cm.
i tried touch switch ic hobbytronics requires large resistor (3mohm in case). works except when power arduino down again, doesn't work until remove , re-add resistor, or dial or down resistance pot. if set sensitively, works while, randomly 1 day might stay triggered when move other side of room...
i hit ebay solutions, there e.g. 12 channel capacitive sensors pads built-in, , want use own faceplate.
can help?
1/ tips on above?
2/ know resistance variable, how surface material, thickness, , surface area affect reliability , / or possibility of triggering switch longer range?
quote
but how surface material, thickness, , surface area affect reliability , / or possibility of triggering switch longer rangethickness not matter, surface area does. bigger surface area better range.
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i want use own faceplate.see this:-
https://www.sparkfun.com/products/9604
add wires attach own face plate. or 1 on break out board.
Arduino Forum > Using Arduino > Sensors > Capacitive Touch Sensors - proximity and reliability
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