Arduino HB100 Frequency Measurement

Projects General Guidance
1

I am new to Arduino and programming and I'm currently working on a project that involves the HB100 doppler radar module with the aim of creating a motion tracker/detector.

I am however stuck as I'm not sure how to measure the IF frequency from the Doppler Module. I am using an amplifier to amplify the signal, and if I do analogRead on the IF of the Doppler Module I get varying voltages which seem to vaguely react to movement near the sensor, but what I really want is the ability to measure the frequency from the module.

There are projects that have used the module with success, and there are various libraries that seem to measurethe frequency but it appears each person does it in a completely different weay and I'm confused on which library to use and how to write code that can measure the frequency.

Has anyone had experience with the HB100 before or frequency measurement and can offer some advice?

Any help would be appreciated.

2

I guess you don't want to measure the frequency but the duty cylce of the PWM signal. This page will guide you how to do that.

3

Hi, sorry to open this old thread but I find myself with similar questions.
I am experimenting with a HB100x (HB100 with built in amp) and I am trying to measure frequency shift using pulsein() but I am not sure if this function (or even Arduino) are capable to measure the frequency I need since my understanding is that the sensor has an output signal with a 10.5MHz freq and what I have read is that pulsein() lowest time count is 2-3 us so that means that the lowest period I could measure is 4 us long, so 250Kz....Is there something I am missing? The module is sold as arduino compatible so I am assuming that there is something I not getting...Thanks in advance for any help.

4

Hi,
Welcome to the forum.

Please read the first post in any forum entitled how to use this forum.
http://forum.arduino.cc/index.php/topic,148850.0.html .
Then look down to item #7 about how to post your code.
It will be formatted in a scrolling window that makes it easier to read.

Have you tried this example and code?

To me it appears that you do not get a distance proportional signal out, but a digital trip when an object is closer than the set distance from the trimpot on the HB100 board.

Tom... :slight_smile: