Two ultrasonic articles

[J_Player]

Wow..! He did it!
Max built the IR LED long time buried metal detector!

I think you're sposta point the LED at long time buried metal things now and listen for a change in the tone at the radio receiver.

Best wishes,
J_P

[Morgan]

MAX desperatus

Hi,
ok...IR-based LRL , you said, can detect a coin at 7meters... so now you have to teach us HOW!

I made the driver circuit... 555, astable mode, 400Hz, 50%duty cycle that directly power two IR leds in series. The 555 is powered by stable 5V by 7805 regulator to avoid voltage floatings due to e.g. battery.

Consumption is around 100mA (depends on leds used).

Ok... here some pictures:

1. circuit (notice the quality... made of pure junk... but I think it's compatible with state of the art lrl ) + bradboard with leds
2. LD271 leds (I guess they are LD271 from what I remember) that glow bright
3. unknown metal can IR leds (760nm I think) that glow but less bright so less efficient

I put the AM radio near... and hear the "tone" at 400Hz (of course).

Now the challenge for you... teach us (poor LRL ignorants) making one that work!

So now... that you're the LRL guru here ... what I have to do with that stuff to detect a coin at 7m... ???

(I will be satisfied also with 50cm detection... just to have proofs that this stuff really work)

Kind regards,
Max

After this demonstration,i only ask ,if you are a skeptic about LRL´s(you call lier to me and Esteban many times),WHY YOU SPEND TIME BUILDING THIS DEVICES ?

[Fred]

I think Max finally found complete information about how to build a LRL so he is doing it...

[Esteban]

Hi,
ok...IR-based LRL , you said, can detect a coin at 7meters... so now you have to teach us HOW!

I made the driver circuit... 555, astable mode, 400Hz, 50%duty cycle that directly power two IR leds in series. The 555 is powered by stable 5V by 7805 regulator to avoid voltage floatings due to e.g. battery.

Consumption is around 100mA (depends on leds used).

Ok... here some pictures:

1. circuit (notice the quality... made of pure junk... but I think it's compatible with state of the art lrl ) + bradboard with leds
2. LD271 leds (I guess they are LD271 from what I remember) that glow bright
3. unknown metal can IR leds (760nm I think) that glow but less bright so less efficient

I put the AM radio near... and hear the "tone" at 400Hz (of course).

Now the challenge for you... teach us (poor LRL ignorants) making one that work!

So now... that you're the LRL guru here ... what I have to do with that stuff to detect a coin at 7m... ???

(I will be satisfied also with 50cm detection... just to have proofs that this stuff really work)

Kind regards,
Max

You are a champion revealing your attitude!

[Max]

After this demonstration,i only ask ,if you are a skeptic about LRL´s(you call lier to me and Esteban many times),WHY YOU SPEND TIME BUILDING THIS DEVICES ?

Hi,
uhm... took 20minutes maybe... some junk parts... why not.
In the case it doesn't work (as probably is and I think of it) I will add to my non-sense collection!

But now... that you're experts ...why don't help make this one reach 7meters on a coin!?

As you can see I'm experimenting...following Esteban's claims and descriptions... so I'm not closed mind about LRL... or not ?

Kind regards,
Max

[Max]

I think Max finally found complete information about how to build a LRL so he is doing it...

Hi,
no, no... I'm doing as Esteban described... now he can help me to reach that 7meters with this simple device... or even 50cm doesn't matter... I just wanna see if "principle" works as Esteban claimed or not!

If anyone wanna try I will post schematic and components bill... (though it's very basic astable 555 and hope anyone can make such calculations...)

Kind regards,
Max

[Max]

You are a champion revealing your attitude!

Hi,
and you're a champion claiming that an IR stuff detects coin at 7meters... than give no hints or clues how to make it work ?

Now... if you're serious about IR LRL detector you'll explain me (us) how to implement or tune this... "device" to get such far detection...

As you can see I spent TIME and EFFORTS for doing this thing you said... and would like to have some RESULT!

Or now... that we are at practical scenario you refuse to give more informations ?

Kind regards,
Max

[Max]

last updates... crazy-lrl!

Hi,
just a couple of pictures about progresses...

Added hot-melt glue... some hard cardboard (?) from trash... and the AM radio... what do you think ...could that stuff detect a coin at 7meters ?

BTW I've added funky component like loop-antenna wired in series with IR diodes...uh!

Now signal at AM radio is VERY strong indeed!

Esteban what do you think ? is that design compatible with 7meters coin detection ?

Hope you'll give hints about...

Kind regards,
Max

[Esteban]

Hi,
and you're a champion claiming that an IR stuff detects coin at 7meters... than give no hints or clues how to make it work ?

Now... if you're serious about IR LRL detector you'll explain me (us) how to implement or tune this... "device" to get such far detection...

As you can see I spent TIME and EFFORTS for doing this thing you said... and would like to have some RESULT!

Or now... that we are at practical scenario you refuse to give more informations ?

Kind regards,
Max

As you said, you spent 20 MINUTES and EFFORT with this junk. Maybe you need to spent 20 years and effort in such junks!

[Esteban]

Hi,
and you're a champion claiming that an IR stuff detects coin at 7meters... than give no hints or clues how to make it work ?

Now... if you're serious about IR LRL detector you'll explain me (us) how to implement or tune this... "device" to get such far detection...

As you can see I spent TIME and EFFORTS for doing this thing you said... and would like to have some RESULT!

Or now... that we are at practical scenario you refuse to give more informations ?

Kind regards,
Max

All the time I give hints and clues, but if you don't pay a minimun of attention I can't repeat it all the time.

As Mr. A. said to me: "If I give all the secret to others, of others will be the credit".

[Esteban]

Hi,
just a couple of pictures about progresses...

Added hot-melt glue... some hard cardboard (?) from trash... and the AM radio... what do you think ...could that stuff detect a coin at 7meters ?

BTW I've added funky component like loop-antenna wired in series with IR diodes...uh!

Now signal at AM radio is VERY strong indeed!

Esteban what do you think ? is that design compatible with 7meters coin detection ?

Hope you'll give hints about...

Kind regards,
Max

Said me, and demonstrate me, in wich part I said that I use in AM mode! Do you see? ... but if you don't pay a minimun of attention I can't repeat it all the time.

[Qiaozhi]

Hi,
just a couple of pictures about progresses...

Added hot-melt glue... some hard cardboard (?) from trash... and the AM radio... what do you think ...could that stuff detect a coin at 7meters ?

BTW I've added funky component like loop-antenna wired in series with IR diodes...uh!

Now signal at AM radio is VERY strong indeed!

Esteban what do you think ? is that design compatible with 7meters coin detection ?

Hope you'll give hints about...

Kind regards,
Max

So what happens when a metal target is passed in front of the LEDs?

[Esteban]

So what happens when a metal target is passed in front of the LEDs?

This is a wrong construction! First of all, as is in AM mode, if you pass a regular size metal, can be a detection but because the ferrite is affected.

[Max]

So what happens when a metal target is passed in front of the LEDs?

Absolutely... NOTHING!
Sounds the same... don't change even a bit...

But maybe requires long time buried metal target...

Kind regards,
Max

[Esteban]

Absolutely... NOTHING!
Sounds the same... don't change even a bit...

But maybe requires long time buried metal target...

Kind regards,
Max

Of course, you can't differentiate anything with the construction you have made!

Regards