Vehicle Loop Detector - Page 2 - Electronic Circuits Projects Diagrams Free

Warpspeed · 13th September 2009, 04:22 AM

A better way to make really BIG buried coils is to get some multi strand data cable, and just connect all the conductors in series.
That way, the underground loop is already waterproof, only the ends where all the connections are, needs to be protected.
And that can be above ground, or even indoors.

butyokz · 14th September 2009, 07:29 AM

thanks it would really help... nice one

The Mad Professor · 22nd October 2009, 10:55 PM

Why stop there?

A smaller version that could use inductance changes to detect a person would make for a really useful way of controlling garden path lights.. or even maybe dance floors...think Michael Jacksons 'Bille Jean' video.

colin55 · 23rd October 2009, 09:16 PM

The vehicle detector may work but the output of the LM393 is not connected to the LED correctly. The whole circuit could be done much simpler with a 74c14. A 4 turn coil 6feet diameter will be about 60uH not 18 uH as you suggest. Using 60uH coil and 470n capacitor produces resonance at approx 30kHz.

maxmcp · 10th November 2009, 03:25 PM

Hi,
I am fairly new to the electronics projects scene, this project looks good, I am finding it a little difficult to find a LM393, but have found a LM392N which seems to have the same pin outputs. Does anyone know whether I could use this instead of the 393, or a good electronics supplier in the UK?

Thanks!

Max

maxmcp · 10th November 2009, 04:48 PM

One other thing that I am not sure of, and was wondering how other people have solved the problem; I would like to replace the LED with a relay to operate anything I wanted to, but this is presumably going to draw a different current, do you just adjust the 1K2 resistor to suit?

Thanks!

chemelec · 11th November 2009, 03:21 PM

Quote:

Originally Posted by maxmcp

One other thing that I am not sure of, and was wondering how other people have solved the problem; I would like to replace the LED with a relay to operate anything I wanted to, but this is presumably going to draw a different current, do you just adjust the 1K2 resistor to suit?

Thanks!

The LM393 is Very Common, But Yes, The LM392 should work.
(Sorry I don't have an LM292 to actually test it.)

Here is a Modified Schematic for a Relay.
http://www3.telus.net/chemelec/Proje.../Loop-Sch2.png

Gary

amit verma · 13th November 2009, 02:15 PM

i want to know, in vehicle loop detector give me specifications of LM 393 IC....
that means tell me which comparator will be used here????
plz do help rgt nw!!!!

chemelec · 13th November 2009, 03:32 PM

Quote:

Originally Posted by amit verma

i want to know, in vehicle loop detector give me specifications of LM 393 IC....
that means tell me which comparator will be used here????
plz do help rgt nw!!!!

The LM393 is Just a Comparator IC.
In this Circuit, the LM393 Compares the Rectified DC Voltage to the Referance Voltage, created across the Foreward Biased Diode.

ANY Comparator IC can be Used, If you wire it Correctly.

maxmcp · 14th November 2009, 01:12 PM

Thanks very much, I'll let you know how it goes!

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13th September 2009, 04:22 AM	#16
Warpspeed	A better way to make really BIG buried coils is to get some multi strand data cable, and just connect all the conductors in series. That way, the underground loop is already waterproof, only the ends where all the connections are, needs to be protected. And that can be above ground, or even indoors.

14th September 2009, 07:29 AM	#17
butyokz	thanks it would really help... nice one Last edited by butyokz; 14th September 2009 at 07:35 AM.

22nd October 2009, 10:55 PM	#18
The Mad Professor	Why stop there? A smaller version that could use inductance changes to detect a person would make for a really useful way of controlling garden path lights.. or even maybe dance floors...think Michael Jacksons 'Bille Jean' video.

23rd October 2009, 09:16 PM	#19
colin55	The vehicle detector may work but the output of the LM393 is not connected to the LED correctly. The whole circuit could be done much simpler with a 74c14. A 4 turn coil 6feet diameter will be about 60uH not 18 uH as you suggest. Using 60uH coil and 470n capacitor produces resonance at approx 30kHz. Last edited by colin55; 23rd October 2009 at 09:45 PM.

10th November 2009, 03:25 PM	#20
maxmcp	Lm392n Hi, I am fairly new to the electronics projects scene, this project looks good, I am finding it a little difficult to find a LM393, but have found a LM392N which seems to have the same pin outputs. Does anyone know whether I could use this instead of the 393, or a good electronics supplier in the UK? Thanks! Max

10th November 2009, 04:48 PM	#21
maxmcp	Relay One other thing that I am not sure of, and was wondering how other people have solved the problem; I would like to replace the LED with a relay to operate anything I wanted to, but this is presumably going to draw a different current, do you just adjust the 1K2 resistor to suit? Thanks!

13th November 2009, 02:15 PM	#23
amit verma	Vehicle Loop Detector i want to know, in vehicle loop detector give me specifications of LM 393 IC.... that means tell me which comparator will be used here???? plz do help rgt nw!!!!

14th November 2009, 01:12 PM	#25
maxmcp	Thanks very much, I'll let you know how it goes!