Pressure Sensitive Touch sensor

silverback

If you need a quick (relatively easy) pressure sensitive touch sensor here is one that worked for me:

I found this sensor detects the following :
no contact
light contact (touching each pad)
higher contact (holding each pad)
highest contact (squeezing each pad)



Code

' {$STAMP BS2}
' {$PBASIC 2.5}
'
' -----[noparse][[/noparse] Program Description ]---------------------------------------------
' Code to use the pressure sensitive RCTime sensor
'
' -----[noparse][[/noparse] Constants and Variables ]-----------------------------------------
'
'
time VAR Word
'
' -----[noparse][[/noparse] Program Code ]----------------------------------------------------
'
 
DO
  HIGH 0
  PAUSE 1000                  'charge the Capacitor
  LOW 0
  RCTIME 1,1, time
  time = time - 10000 / 100  'this is for formatiing of the DEC
  DEBUG DEC time, CR         'used for StampPlot graphing
  PAUSE 500

LOOP

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If you convince yourself that something is impossible before you even try; you are sure to prove yourself right.

Don M

What program are you using that is producing the oscillograph on your pc?

Spiral_72

Sweet! Thanks for sharing!

I'm gonna try it [noparse]:)[/noparse]

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"puff"...... Smile, there went another one.

silverback

Don, the program is Stamp Plot Pro



-general circuit update-

I noticed a fair amount of reverse voltage would show up on the base when I would release pressure on the touchpad that connects to it, so I added a diode (1n4001) in line with the touchpad·to block reverse voltage.






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If you convince yourself that something is impossible before you even try; you are sure to prove yourself right.

Post Edited (silverback) : 4/15/2010 10:24:44 AM GMT