HB100 Radar Module

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jgmdesign wrote:
You do not get a 10Ghz waveform from the HB100 output.

and, even if you did, I rather doubt that you'd see it on the scope ...

 

You didn't pay attention to the instructions for getting your pictures visible in the post - did you?

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Thank you for your explanation about waveform.

i use adapter power for supply right now. how if i will try to use battery for power supply and connect ground to negative pole of battery? and i change the op-amp to LM358? is it better proposed design?

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i add media before this, but my picture looked too large and rotated so i attach them 

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Riantjr wrote:
and i change the op-amp to LM358? is it better proposed design?

No, the LM358 is poor for noise AND response.

 

Look for Low noise FET opamps.  Rail to Rail type is what I used.  Cannot remember the part number as I had them in my stores.

 

Jim

 

EDIT...

Post a picture of your schematic of your circuit so we have an idea what you have done.  I remember I had three gain stages and lastly a comparator for driving the AVR's input.  This setup kept noise to a minimum and the last stage provided a lean, TTL signal to teh AVR.

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Last Edited: Wed. Apr 18, 2018 - 06:12 PM
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Jim,

the OP has followed the application note I found.

 

In their schematic they also use a LM324.

 

 

 

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I tried that circuit and the LM324 performance was not very good. I ended up spinning a three stage circuit with each stage of low gain. I wish I could remember the part numbers of the OP amps I used.

Jim

Edit:
I should read my threads...I used an OP2703 in the stages, and I did note in the early posts that the performance of the LM324 was horrible.

I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

 

"The critical shortage here is not stuff, but time." - Johan Ekdahl

 

"Step N is required before you can do step N+1!" - ka7ehk

 

"If you want a career with a known path - become an undertaker. Dead people don't sue!" - Kartman

"Why is there a "Highway to Hell" and only a "Stairway to Heaven"? A prediction of the expected traffic load?"  - Lee "theusch"

 

Speak sweetly. It makes your words easier to digest when at a later date you have to eat them ;-)  - Source Unknown

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

Last Edited: Thu. Apr 19, 2018 - 12:46 PM
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Although that is the App Note / suggested circuit, it is a pretty weak design.

 

The LM324 isn't rail-to-rail.

More importantly, it isn't even close to rail-to-rail.

When run on a single supply 5 V power supply there is a rather narrow "linear range", in which the chip functions like an op-amp.

 

The 324 can be very useful when one is running a unipolar 12 V power supply, or even a +/- 12V power supply, as it has a very wide Vin range.

Low voltage, unipolar designs, however, just are that chip's niche.

 

JC

 

 

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Good thing this isn't the ER, you've left out an extremely important knot!devil

DocJC wrote:
just are ___ that chip's niche.

David (aka frog_jr)

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I had to spell niche 3 times to get it right...

 

I think I may have lost a not or two during the multiple editing episodes.

 

Of course it might well have just been omitted from the get go!

 

JC

 

 

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oh.. yes, i saw your type of op-amp in early post, forgive me if i didn't read that carefully Jim

 

unfortunately in my country op2703 pretty hard to find and i try to use tl071, and still on progress to get waveform result. i hope the result waveform can be read by microcontroller digital input 3.3 v

 

and i want to ask, Can we add circuit using HB100 to detect object moving toward or away? 

Last Edited: Fri. Apr 20, 2018 - 05:24 PM
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I am not 100% sure, but I think the sensor signal (after the demodulation transistor) is very much alike to the signal out of a PIR motion sensor.

I've looked at a few PIR motion sensor IC's and they are mostly a few opamps, used as a very high gain low frequency amplification (Filtered at 10Hz or less) , followed by a flipflop and a timer circuit. These PIR sensors are very common and are often still built with Through hole technology. Easy to hack into. It might be an good idea to re-use the PCB of a PIR sensor for this (And then just ignore the flipflop & timer part).

 

About the frequency range:

These sensors work with doppler. The 10GHZ output signal is mixed with the reflected signal. For slow moving signals (such as walking in front of the sensor) you will get signals around the 1Hz range. If you glue a piece of aluminimum foil onto a small loudspeaker, you might be able to pick up the audio from the loudspeaker with the HB100, but I haven't tried that.

Doing magic with a USD 7 Logic Analyser: https://www.avrfreaks.net/comment/2421756#comment-2421756

Bunch of old projects with AVR's: http://www.hoevendesign.com

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If you Google the HB100 there are down very good YouTube videos on the device.
You do not need to use the ones I used...you just need a well thought out circuit.

Jim

I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

 

"The critical shortage here is not stuff, but time." - Johan Ekdahl

 

"Step N is required before you can do step N+1!" - ka7ehk

 

"If you want a career with a known path - become an undertaker. Dead people don't sue!" - Kartman

"Why is there a "Highway to Hell" and only a "Stairway to Heaven"? A prediction of the expected traffic load?"  - Lee "theusch"

 

Speak sweetly. It makes your words easier to digest when at a later date you have to eat them ;-)  - Source Unknown

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

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bobgardner wrote:

There's an AVRfreak from Chanute Kansas. That's where the Kustom Dual Stalker radar gun used by the Florida Highway Patrol is made. There is a brochure on their site. It has a beam width of 6 degrees but I wonder if any radar engineers know how these things work. I have heard that they are calibrated with a tuning fork. Is it CW? Doppler? Regular old radar with a PRF? If so, it must have a 'blind' range that has a period that is a multiple of the PRF. So you could blow thru the trap at this achilles heel speed. They might design it to be 200mph. Only a Lambo could bust the trap.

 

 

[cringes at bringing up way old topic] but i have an old Kustom Radar gun, and it includes an audible output (i.e. a speaker), so you could hear the Doppler effect.  You can find quite cheap ex-police radar guns on ebay for quite cheap (or you could back when your original post was made).  A quick search shows an old Kustom KR-8 for $39 USD.  Mine is a Falcon 1, and I have a laser version too.  Kustom also make those speed warning signs, so you might be able to grab a replacement or used radar unit from one of those.  They are **extremely** fun to play with, and can pick up an electric guitar's string vibrations.   +12V/GND/Signal, wire the signal into you home stereo or directly into a micro.  Might cost a little more than a $10 HB100 module and use a bit more power, but from a "power/capability vs cost" perspective they'd have to be a order of magnitude better in value.

 

There's also lots of other companies than make similar units for speed signs, quite a lot would be X band because it's just easier to make.

 

I wouldn't go using them in internal alarm systems though, I seem to recall my hand warming up when I was playing the guitar for the aforementioned test.

 

Anyway, I'm reading up on this thread because I actually do want to make an internal alarm, and have a HB100 (well, actually it's an MDU 1620 Motion Detector Unit from Microwave Solutions (http://www.microwave-solutions.com). ) in the UK, but there are no datasheets or app-notes and it appears to be a drop-in replacement for the HB100.

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sfinktah wrote:
Anyway, I'm reading up on this thread because I actually do want to make an internal alarm, and have a HB100 (well, actually it's an MDU 1620 Motion Detector Unit from Microwave Solutions (http://www.microwave-solutions.com). ) in the UK, but there are no datasheets or app-notes and it appears to be a drop-in replacement for the HB100.

 

The website has the MDU1720...  Looks exactly like the HB100 I used:

https://www.microwave-solutions....

 

Datasheet on the homepage:

https://www.microwave-solutions....

 

Jim

 

I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

 

"The critical shortage here is not stuff, but time." - Johan Ekdahl

 

"Step N is required before you can do step N+1!" - ka7ehk

 

"If you want a career with a known path - become an undertaker. Dead people don't sue!" - Kartman

"Why is there a "Highway to Hell" and only a "Stairway to Heaven"? A prediction of the expected traffic load?"  - Lee "theusch"

 

Speak sweetly. It makes your words easier to digest when at a later date you have to eat them ;-)  - Source Unknown

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

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And of course these days many cars have anti-collision forward looking radar modules.

 

Those would be fun to hack!

 

JC

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