Please help me to build a code for a HB100 radar sensor

Pommie said:

What do you have so far? Do you have an amplifier? Do you have a schematic? Source code (sketch)?

Mike.

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rjenkinsgb said:

In essence, you need a frequency meter system.

Have a look at this:
**broken link removed**.

The only real difference is that you need to scale the "frq" measurement result appropriately from doppler frequency to speed.

But get it working displaying the raw frequency first!

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Pavi98 said:

how would I modify the code for the purpose?

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#include <FreqCounter.h>

void setup() {
  Serial.begin(57600);                    // connect to the serial port
  Serial.println("Frequency Counter");
}

long int frq;
float speed;

Void loop() {

    FreqCounter::f_comp= 8;                 // Set compensation to 12
    FreqCounter::start(100);                // Start counting with gatetime of 100ms
    while (FreqCounter::f_ready == 0)       // wait until counter ready

    frq=FreqCounter::f_freq;              // read result

    speed = (float)frq / 19.49;           // Scale frequency to speed

    Serial.println(speed);                     // print result
    delay(20);
}

rjenkinsgb said:

In principle, just divide the frequency reading by whatever the scale factor is, to get the speed.
I've made "speed" a floating point value and cast "frq" to a float for the division, to ensure a floating point calculation rather than integer.

eg.

C:

#include <FreqCounter.h>

void setup() {
  Serial.begin(57600);                    // connect to the serial port
  Serial.println("Frequency Counter");
}

long int frq;
float speed;

Void loop() {

    FreqCounter::f_comp= 8;                 // Set compensation to 12
    FreqCounter::start(100);                // Start counting with gatetime of 100ms
    while (FreqCounter::f_ready == 0)       // wait until counter ready

    frq=FreqCounter::f_freq;              // read result

    speed = (float)frq / 19.49;           // Scale frequency to speed

    Serial.println(speed);                     // print result
    delay(20);
}

Click to expand...