Published February 15, 2023 © MIT

Working with MR24HPC1

Get started with seeed static human presence sensor

BeginnerFull instructions provided2 hours2,814

Things used in this project

Hardware components

Seeed Studio MR24HPC1 Human Presence Sensor

Seeed Studio Seeeduino XIAO Expansion board

Seeed Studio XIAO ESP32C3

LED Stick, NeoPixel Stick

Jumper wires (generic)

Software apps and online services

Arduino IDE

Hand tools and fabrication machines

3D Printer (generic)

Optional

Story

Well, this project is a by product. I wanted to recreate one of my projects buddy by replacing AK9753 - Human Presence Sensor with low cost 24GHz mmWave Sensor - Human Static Presence. When I was receive the sensor from Seeed, I wanted to quickly test it's accuracy to evaluate if it will fit my use case.

Unfortunately, I was not satisfied with the reading out of the box. Then I got in touch with Seeed engineers who recommended to make some adjustment to the sensor based on my room. With those changes, I got pretty good readings. Before I jump into my project, I thought it will help other makers if I document how I modified the sensor settings.

Hardware Connection

I found it difficult to test the reading through serial monitor output because I need to stay close to the sensor. So I decided to use NeoPixel stick with LEDs to visualize the reading from distance without looking at the serial monitor.

For detail about the sensor and connection, checkout the wiki.

And connect NeoPixel to D0.

Then upload the program "XIAO_ESP32C3_Human_Presence.ino" and observe the LED color changes.

Here is the color scheme

Green - someone is present

White - no body

Red - someone stopped

Yellow - someone is moving

Blue - someone is closing in

Light blue - someone is moving away

Test the sensor with different moves. If you don't get expected result, you should consider to modify settings specially scene and sensitivity.

Modify Sensor

Before you do anything, I would highly recommend you to read the user manual.

I was testing in my home office which is about 10 square meters. Suggested scenario model was 02- area detection and sensitivity 02.

const unsigned char scene_buff[10] = {0x53, 0x59, 0x05, 0x07, 0x00, 0x01, 0x02, 0xBB, 0x54, 0x43};

const unsigned char sensitivity_buff[10] = {0x53, 0x59, 0x05, 0x08, 0x00, 0x01, 0x02, 0xBC, 0x54, 0x43};

You should consult the user manual to come up with the byte array.

Once you get your byte array, update the line #23 & #24 of "MR24HPC1ConfigESP3C.ino" and flash the board. The program will communicate to MR24HPC1 sensor over serial port and set the scenario and sensitivity.

Try out different scenario model and sensitivity and find the best match according to your environment.

Demo Video

Hope this helps!

#include "Arduino.h"
#include <humanstaticLite.h>
#include <U8x8lib.h>
#include <Wire.h>
#include<HardwareSerial.h>

#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h>  // Required for 16 MHz Adafruit Trinket
#endif


#define PIN        D0 // On Trinket or Gemma, suggest changing this to 1

// How many NeoPixels are attached to the Arduino?
#define NUMPIXELS 8 // Popular NeoPixel ring size



HardwareSerial UART(0);
HumanStaticLite radar = HumanStaticLite(&UART);

const unsigned char scene_buff[10] = {0x53, 0x59, 0x05, 0x07, 0x00, 0x01, 0x02, 0xBB, 0x54, 0x43}; 
const unsigned char sensitivity_buff[10] = {0x53, 0x59, 0x05, 0x08, 0x00, 0x01, 0x02, 0xBC, 0x54, 0x43}; 

Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRBW + NEO_KHZ800);

void setup() {

  Serial.begin(115200);
  //Serial1.begin(115200);
  UART.begin(115200, SERIAL_8N1, -1, -1); 

  
  pixels.begin();
  pixels.setBrightness(100);
  setRingColor(255, 255, 255);
  delay(10000);


  //first reset the radar
  radar.reset_func();
  setRingColor(255, 0, 0);
  delay(5000);
  setRingColor(255, 255, 255);
  delay(5000);


  //set scene to object detection
  radar.checkSetMode_func(scene_buff, 10, false);
  delay(1000);   //Do not set the delay time too long, as this may affect the reception of the data frames returned by the radar.
  setRingColor(0, 0, 255);
  delay(5000);
  setRingColor(255, 255, 255);
  delay(5000);

  //set sensitivity to 2
  radar.checkSetMode_func(sensitivity_buff, 10, false);
  delay(1000);   //Do not set the delay time too long, as this may affect the reception of the data frames returned by the radar.
  setRingColor(0, 255, 0);
  delay(5000);

  

}

void blink(){
  
}

void setRingColor(uint8_t r, uint8_t g, uint8_t b){
  pixels.clear();
  for(int i=0; i<NUMPIXELS; i++) { // For each pixel...

    pixels.setPixelColor(i, pixels.Color(r, g, b));

    pixels.show();   // Send the updated pixel colors to the hardware.

    delay(50); // Pause before next pass through loop
  }
  
}


void loop() {

  



}

#include "Arduino.h"
#include <humanstaticLite.h>
#include <U8x8lib.h>
#include <Wire.h>
#include<HardwareSerial.h>

#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h>  // Required for 16 MHz Adafruit Trinket
#endif


#define PIN        D0 // On Trinket or Gemma, suggest changing this to 1

// How many NeoPixels are attached to the Arduino?
#define NUMPIXELS 8 // Popular NeoPixel ring size



HardwareSerial UART(0);
HumanStaticLite radar = HumanStaticLite(&UART);

U8X8_SSD1306_128X64_NONAME_HW_I2C display(/* reset=*/ U8X8_PIN_NONE);   // OLEDs without Reset of the Display
//int led = D0;
Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRBW + NEO_KHZ800);
uint8_t brightness = 100;

void setup() {

  Serial.begin(115200);
  UART.begin(115200, SERIAL_8N1, -1, -1); 

  
  pixels.begin();
  pixels.setBrightness(100);
  setRingColor(255, 255, 255);
  delay(5000);
  

}



void setRingColor(uint8_t r, uint8_t g, uint8_t b){
  pixels.clear();
  for(int i=0; i<NUMPIXELS; i++) { // For each pixel...

    pixels.setPixelColor(i, pixels.Color(r, g, b));

    pixels.show();   // Send the updated pixel colors to the hardware.

    delay(25); // Pause before next pass through loop
  }
  
}


void loop() {

  
  
  // // put your main code here, to run repeatedly:
  radar.HumanStatic_func(false);    //Turn off printing of human movement sign parameters
  int radarStatus = radar.radarStatus ;
  pixels.setBrightness(255);

  if(radarStatus != 0x00){
    switch(radar.radarStatus){
      Serial.println(radar.radarStatus);
      case SOMEONE:
        Serial.println("Someone is here.");
        Serial.println("---------------------------------");
        setRingColor(0, 255, 0); //green
        break;
      case NOONE:
        Serial.println("Nobody here.");
        Serial.println("---------------------------------");
        setRingColor(255, 255, 255); //white
        break;
      case NOTHING:
        Serial.println("No human activity messages.");
        Serial.println("---------------------------------");
        setRingColor(255, 255, 255); //white
        break;
      case SOMEONE_STOP:
        Serial.println("Someone stop");
        Serial.println("---------------------------------");
        setRingColor(255, 0, 0); //red
        break;
      case SOMEONE_MOVE:
        Serial.println("Someone moving");
        Serial.println("---------------------------------");
        setRingColor(255,255,0); //yellow
        break;
      case HUMANPARA:
        Serial.print("The parameters of human body signs are: ");
        Serial.println(radar.bodysign_val, DEC);
        Serial.println("---------------------------------");
        
        pixels.setBrightness(5);
        setRingColor(0, 255, 0); //light green
        
        break;
      case SOMEONE_CLOSE:
        Serial.println("Someone is closing");
        Serial.println("---------------------------------");
        setRingColor(0, 0, 255); //blue
        break;
      case SOMEONE_AWAY:
        Serial.println("Someone is staying away");
        Serial.println("---------------------------------");
        pixels.setBrightness(5);
        setRingColor(0,0,255); //light blue
        
        break;
      case DETAILMESSAGE:
        Serial.print("Spatial static values: ");
        Serial.println(radar.static_val, DEC);
        Serial.print("Distance to stationary object: ");
        Serial.println(radar.dynamic_val, DEC);
        Serial.print("Spatial dynamic values: ");
        Serial.println(radar.dis_static, DEC);
        Serial.print("Distance from the movement object: ");
        Serial.println(radar.dis_move, DEC);
        Serial.print("Speed of moving object: ");
        Serial.println(radar.speed, DEC);
        Serial.println("---------------------------------");
        setRingColor(0, 0, 0); //cyan
        break;
    }
  }else{
    
  }
  delay(200);


}

Credits

Mithun Das

33 projects • 170 followers

Hacker and Maker driven by passion. Ambassador at Edge Impulse and Balena. Follow me on Twitter @_mithundas

Working with MR24HPC1

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Hardware Connection

Modify Sensor

Demo Video

Code

MR24HPC1ConfigESPC3.ino

XIAO_ESP32C3_Human_Presence.ino

Credits

Mithun Das

Comments

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Working with MR24HPC1

Working with MR24HPC1

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Hardware Connection

Modify Sensor

Demo Video

Code

MR24HPC1ConfigESPC3.ino

XIAO_ESP32C3_Human_Presence.ino

Credits

Mithun Das

Comments

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