Been on my waiting list of "USEFULL" things to post...
Building your own knock sensor circuit...
Basic parts that you will need
390 ohm resistor, 1/2W (2)
piezo buzzer (not required)
any led
bread board
1N914 or 1N9148 diode
390 Ohm resistor, 1/2 Watt, ±5% (5)
15K Ohm resistor, 1/4 Watt, ±5% (5)
100K Ohm resistor, 1/4 Watt, ±5% (5)
1µF tantalum capacitor, ±10%
Disk capacitor, .01µF
Disk capacitor, .1µF (2)
555 timer IC - good idea to het the DIP socket for those incase events
PN2222 NPN transistor
Basically all the circuit does is detect the spike from the knock sensor and delay the output / drag it out, since the spike from the sensor is so fast one need to slow down the output signal in a way that one can read it.
Cicruit
Here is mine complete, i didn't built the led into the circuit since I want to remotely mount it somewhere.
Original link / Free Plug
http://www.gnttype.org/techarea/project ... spage.html
DIY Knock Sensor Circuit
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DIY Knock Sensor Circuit
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You must whack the block, not the sensor...Ero_sennin wrote:maybe you whacked it too hard, thats why it's still complaining!Vlade wrote:no tried it on a bare block, put a knock sensor on the block, earthed the block with -12V and whacked it with a hammer
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