Shahariar
Published © CC BY-SA

Swim'Safe: An Underwater Drown Detection Beacon

A wearable solution to detect if a disabled person got drowned and try to draw the attention of Lifeguards for help !!

BeginnerFull instructions provided4 hours403

Things used in this project

Hardware components

Beetle - The Smallest Arduino
DFRobot Beetle - The Smallest Arduino
×1
Grove - OLED Display 1.12'' V2
Seeed Studio Grove - OLED Display 1.12'' V2
×1
Infineon DSP368 Pressure Sensor
×1
Battery, 3.7 V
Battery, 3.7 V
×1
Dot Laser Diode
×8
Dead Smart Watch or 3D Printed Enclosure
×1

Software apps and online services

Arduino IDE
Arduino IDE

Hand tools and fabrication machines

Soldering iron (generic)
Soldering iron (generic)
Hot glue gun (generic)
Hot glue gun (generic)

Story

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Schematics

Schematic Drown Detector Prototype

Code

Drown Detector

C/C++
#include <Arduino.h>
#include <U8g2lib.h>
#include <Wire.h>
#include <Dps3xx.h>

#define USER_BUTTON A0

// Dps3xx Object
Dps3xx Dps3xxPressureSensor = Dps3xx();
U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE, /* clock=*/ 16, /* data=*/ 17);   // ESP32 Thing, HW I2C with pin remapping

uint8_t button_state = 0;
uint8_t exit_timer = 0;
float drown_depth = 0.0;

void setup()
{
  Wire.begin();
  u8g2.begin();
  Dps3xxPressureSensor.begin(Wire);

  pinMode (A2, OUTPUT);
  digitalWrite(A2, LOW);
  pinMode (USER_BUTTON, INPUT_PULLUP);


  // blinky check for device functionality

  for (int i = 0; i < 4; i++)
  {
    digitalWrite(A2, HIGH);
    delay(200);
    digitalWrite(A2, LOW);
    delay(200);
  }


}

void loop()
{
  float temperature;
  float air_pressure;
  float underwater_pressure;
  uint8_t oversampling = 7;
  int16_t ret;

  ret = Dps3xxPressureSensor.measurePressureOnce(air_pressure, oversampling);
  ret = Dps3xxPressureSensor.measurePressureOnce(air_pressure, oversampling);

  // Scroll through setup menu

  while (button_state == 0)
  {
    u8g2.clearBuffer();
    u8g2.setFont(u8g2_font_ncenB10_tr);
    u8g2.setCursor(25, 15);
    u8g2.print("Press Button");
    u8g2.setCursor(25, 30);
    u8g2.print("To Calibrate");
    u8g2.setCursor(30, 55);
    u8g2.print(air_pressure);
    u8g2.sendBuffer();
    read_button();
    delay(100);

  }

  while (button_state >= 1 && exit_timer < 50)
  {
    u8g2.clearBuffer();
    u8g2.setFont(u8g2_font_ncenB10_tr);
    u8g2.setCursor(25, 15);
    u8g2.print("Set Depth of");
    u8g2.setCursor(25, 30);
    u8g2.print("Drown Detect");
    u8g2.setCursor(25, 55);
    drown_depth = 0.1 * button_state;
    u8g2.print(drown_depth);
    u8g2.setCursor(55, 55);
    u8g2.print("at meters");
    u8g2.sendBuffer();
    read_button();
    exit_timer++;
    delay(100);

  }

  while (digitalRead(USER_BUTTON))
  {
    u8g2.clearBuffer();
    u8g2.setFont(u8g2_font_ncenB10_tr);
    u8g2.setCursor(25, 15);
    u8g2.print("Drown Detect");
    u8g2.setCursor(25, 30);
    u8g2.print("  is Active !!!");
    u8g2.setCursor(25, 55);
    u8g2.print(" Swim Safely ");
    u8g2.sendBuffer();
    ret = Dps3xxPressureSensor.measurePressureOnce(underwater_pressure, oversampling);
    digitalWrite(A2, LOW);


    // if water presure increase from drowning
    // 1m water column pressure = 10000 Pa
    while (underwater_pressure > (air_pressure + drown_depth * 10000))
    {
      u8g2.clearBuffer();
      u8g2.setFont(u8g2_font_ncenB10_tr);
      u8g2.setCursor(25, 15);
      u8g2.print(" Drowning  !!");
      u8g2.setCursor(25, 30);
      u8g2.print("Please Help !");
      u8g2.setCursor(25, 55);
      u8g2.print("Beacon Active");
      u8g2.sendBuffer();
      ret = Dps3xxPressureSensor.measurePressureOnce(underwater_pressure, oversampling);
      digitalWrite(A2, HIGH);
      delay(100);
    }
  }
  button_state = 0;
}



void read_button (void)
{
  if (!digitalRead(USER_BUTTON))
  {
    button_state ++;
  }

}

Credits

Shahariar

Shahariar

73 projects β€’ 264 followers
"What Kills a 'Great life' is a 'Good Life', which is Living a Life Inside While Loop"

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