555 timer can be used for ultrasonic motion sensor? - Electronic Circuits Projects Diagrams Free

legolaslee · 29th July 2008, 01:37 PM

Any idea? Can I implement a 555 timer IC instead of LM741 or LM324? So that whenever motion is detected, an LED will light up.

audioguru · 29th July 2008, 02:36 PM

Motion causes interference in ultrasonic waves. Then an opamp is needed to amplify the interference.
A 555 is a switch or an oscillator, not an amplifier.

legolaslee · 29th July 2008, 02:50 PM

Oh. Can i use other ICs other than GL3274?

audioguru · 29th July 2008, 03:23 PM

Ultrasonic is high frequency sound.
The GL3274 is a preamp for an Infrared Photo-diode that is completely different.
The GL3274 has a limiter that would prevent an infrared circuit from detecting motion.

legolaslee · 29th July 2008, 03:24 PM

hmm. Any suggestions for an IC to use to connect the ultrasonic receiver circuit?

ericgibbs · 29th July 2008, 03:25 PM

Quote:

Originally Posted by legolaslee

hmm. Any suggestions for an IC to use to connect the ultrasonic receiver circuit?

Look at this:

http://www.ee.latrobe.edu.au/~djc/Ul...ltrasonics.htm

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29th July 2008, 01:37 PM	(permalink)
legolaslee	555 timer can be used for ultrasonic motion sensor? Any idea? Can I implement a 555 timer IC instead of LM741 or LM324? So that whenever motion is detected, an LED will light up.

29th July 2008, 02:36 PM	(permalink)
audioguru	Motion causes interference in ultrasonic waves. Then an opamp is needed to amplify the interference. A 555 is a switch or an oscillator, not an amplifier. __________________ Uncle $crooge

29th July 2008, 02:50 PM	(permalink)
legolaslee	Oh. Can i use other ICs other than GL3274?

29th July 2008, 03:23 PM	(permalink)
audioguru	Ultrasonic is high frequency sound. The GL3274 is a preamp for an Infrared Photo-diode that is completely different. The GL3274 has a limiter that would prevent an infrared circuit from detecting motion. __________________ Uncle $crooge

29th July 2008, 03:24 PM	(permalink)
legolaslee	hmm. Any suggestions for an IC to use to connect the ultrasonic receiver circuit?