HB100 Radar Module

Go To Last Post
63 posts / 0 new

Pages

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 1

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?

Top Tips:

  1. How to properly post source code - see: https://www.avrfreaks.net/comment... - also how to properly include images/pictures
  2. "Garbage" characters on a serial terminal are (almost?) invariably due to wrong baud rate - see: https://learn.sparkfun.com/tutorials/serial-communication
  3. Wrong baud rate is usually due to not running at the speed you thought; check by blinking a LED to see if you get the speed you expected
  4. Difference between a crystal, and a crystal oscillatorhttps://www.avrfreaks.net/comment...
  5. When your question is resolved, mark the solution: https://www.avrfreaks.net/comment...
  6. Beginner's "Getting Started" tips: https://www.avrfreaks.net/comment...
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

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?

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

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

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 1

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.

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

 

"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 user

Last Edited: Wed. Apr 18, 2018 - 06:12 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Jim,

the OP has followed the application note I found.

 

In their schematic they also use a LM324.

 

 

 

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 1

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

 

"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 user

Last Edited: Thu. Apr 19, 2018 - 12:46 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 1

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

 

 

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 1

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)

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

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

 

 

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

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
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 1

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

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

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

 

"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 user

Pages