Quote from Matoo robot on 2024年7月10日, pm5:28

Welcome to the tutorial on using the LD2410C human presence status detection module. This device, developed by Hi-link, is a versatile and highly sensitive tool that uses frequency modulated continuous waves (FMCW) to detect the presence of humans in a designated area.

Project description

Welcome to the tutorial on using the LD2410C human presence status detection module. This device, developed by Hi-link, is a versatile and highly sensitive tool that uses frequency modulated continuous waves (FMCW) to detect the presence of humans in a designated area.

https://youtu.be/3d5mTK5qboQ

Electronic components

Arduino micro

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micro usb cable

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female female dupont cables

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male pins

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Socket for arduino micro

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PCB

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Download gerber file –> $ https://rogerbit.com/wprb/wp-content/uploads/2022/03/teclado-arduino-micro.zip $ 

Circuit

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Code

/*
 * Sketch example for reporting LD2410 readings using the currently configured setup.
 * 
 * This has been tested on the following platforms...
 * 
 * On ESP32, connect LD2410 to GPIO pins 32 and 33
 * On ESP32S2, connect LD2410 to GPIO pins 8 and 9
 * On ESP32C3, connect LD2410 to GPIO pins 4 and 5
 * On Arduino Leonardo or other ATmega32u4 boards, connect LD2410 to the hardware serial TX and RX pins
 * 
 * Serial configuration for other boards will vary and should be assigned by yourself
 * 
 * There's no example for ESP8266 as it only has one usable UART and won't boot if alternative UART pins are used for the radar.
 * 
 * For this sketch and other examples to be useful, the board must have two usable UARTs.
 * 
 */
int redPin = 11; //  Red pin 
int greenPin = 9; // Green pin
int bluePin = 10; // Blue pin
byte com = 0; 
#if defined(ESP32)
  #ifdef ESP_IDF_VERSION_MAJOR // IDF 4+
    #if CONFIG_IDF_TARGET_ESP32 // ESP32/PICO-D4
      #define MONITOR_SERIAL Serial
      #define RADAR_SERIAL Serial1
      #define RADAR_RX_PIN 32
      #define RADAR_TX_PIN 33
    #elif CONFIG_IDF_TARGET_ESP32S2
      #define MONITOR_SERIAL Serial
      #define RADAR_SERIAL Serial1
      #define RADAR_RX_PIN 9
      #define RADAR_TX_PIN 8
    #elif CONFIG_IDF_TARGET_ESP32C3
      #define MONITOR_SERIAL Serial
      #define RADAR_SERIAL Serial1
      #define RADAR_RX_PIN 4
      #define RADAR_TX_PIN 5
    #else 
      #error The CONFIG_IDF_TARGET target is not supported
    #endif
  #else // ESP32 before IDF 4.0
    #define MONITOR_SERIAL Serial
    #define RADAR_SERIAL Serial1
    #define RADAR_RX_PIN 32
    #define RADAR_TX_PIN 33
  #endif
#elif defined(__AVR_ATmega32U4__)
  #define MONITOR_SERIAL Serial
  #define RADAR_SERIAL Serial1
  #define RADAR_RX_PIN 0
  #define RADAR_TX_PIN 1
#endif
#include <ld2410.h>
ld2410 radar;
uint32_t lastReading = 0;
bool radarConnected = false;
void setup(void)
{
  pinMode(redPin, OUTPUT); // Set redPin as an output
  pinMode(greenPin, OUTPUT); // Set greenPin as an output
  pinMode(bluePin, OUTPUT); // Set bluePin as an output
  MONITOR_SERIAL.begin(115200); // Serial Monitor feedback
  // radar.debug(MONITOR_SERIAL); // Uncomment to show library debug info on Serial Monitor. By default, this does not show sensor readings as they are very frequent.
  #if defined(ESP32)
    RADAR_SERIAL.begin(256000, SERIAL_8N1, RADAR_RX_PIN, RADAR_TX_PIN); // UART for radar monitoring
  #elif defined(__AVR_ATmega32U4__)
    RADAR_SERIAL.begin(256000); // UART for radar monitoring
  #endif
  delay(500);
  MONITOR_SERIAL.print(F("nConnect LD2410 radar TX to GPIO:"));
  MONITOR_SERIAL.println(RADAR_RX_PIN);
  MONITOR_SERIAL.print(F("Connect LD2410 radar RX to GPIO:"));
  MONITOR_SERIAL.println(RADAR_TX_PIN);
  MONITOR_SERIAL.print(F("Initializing LD2410 radar sensor: "));
  if(radar.begin(RADAR_SERIAL))
  {
    MONITOR_SERIAL.println(F("OK"));
    MONITOR_SERIAL.print(F("LD2410 firmware version: "));
    MONITOR_SERIAL.print(radar.firmware_major_version);
    MONITOR_SERIAL.print('.');
    MONITOR_SERIAL.print(radar.firmware_minor_version);
    MONITOR_SERIAL.print('.');
    MONITOR_SERIAL.println(radar.firmware_bugfix_version, HEX);
  }
  else
  {
    MONITOR_SERIAL.println(F("not connected"));
  }
}
void loop()
{
  radar.read();
  if(radar.isConnected() && millis() - lastReading > 1000)  // Report every 1000ms
  {
    lastReading = millis();
    if(radar.presenceDetected())
    {
      if(radar.stationaryTargetDetected())//If a stationary target is detected, it turns blue
      {
        Serial.print(F("Stationary Target BLUE LIGHT: "));
        Serial.print(radar.stationaryTargetDistance());
        Serial.print(F("cm energy:"));
        Serial.print(radar.stationaryTargetEnergy());
        Serial.println(' ');
        color(0, 0, 255); // RGB LED as blue
      }
      if(radar.movingTargetDetected())//If a moving target is detected, it turns red
      {
        Serial.print(F("MOVING TARGET DETECTED RED LIGHT!: "));
        Serial.print(radar.movingTargetDistance());
        Serial.print(F("cm energy:"));
        Serial.print(radar.movingTargetEnergy());
        color(255, 0, 0);// RGB LED as red
      }
      Serial.println();
    }
    else
    {
      Serial.println(F("No Target GREEN LIGHT"));//No target in range, turns green
      color(0,255, 0);// RGB LED as green
    }
  }
}
//Function for generating color
void color (unsigned char red, unsigned char green, unsigned char blue) 
{
analogWrite(redPin, red*102/255);
analogWrite(bluePin, blue*173/255);
analogWrite(greenPin, green*173/255);
}