Arduino “having11” Guy
Published © CC BY-NC-ND

ESP32 Fall Detector

An improvement from my previous fall detector. It can send an email by sensing a fall or with the simple press of a button.

IntermediateFull instructions provided6 hours1,144
ESP32 Fall Detector

Things used in this project

Hardware components

DFRobot ESP32 ESP-WROOM Module
×1
Silicon Labs CP2102 USB to UART Bridge
×1
MCP73831 Li-Ion Charger IC
×1
LM317BD2T Adjustable Regulator
×1
0805 4.7uF Capacitor
×2
0805 100nF Capacitor
×1
0805 1uF Capacitor
×1
WS2812b LED
×1
1206 LED
×4
Micro USB Connector
×1
0805 470 ohm Resistor
×1
0805 2k ohm Resistor
×1
0805 510 ohm Resistor
×1
0805 300 ohm Resistor
×1
0805 10k ohm Resistor
×2
0805 270 ohm Resistor
×2
6mm x 6mm Pushbutton
×2
SMD 6mm x 6mm Tall Pushbutton
×1

Software apps and online services

Autodesk EagleCAD
Fusion 360
Autodesk Fusion 360

Hand tools and fabrication machines

3D Printer (generic)
3D Printer (generic)
Soldering iron (generic)
Soldering iron (generic)
Digital Microscope

Story

Read more

Schematics

Schematic

Board Schematic

Code

ESP32 Code Main

C/C++
#include <Wire.h>
#include <SimpleTimer.h>

#include <Arduino.h>

#include <WiFi.h>
#include <WiFiMulti.h>

#include <HTTPClient.h>
#include "sendemail.h"

const int MPU_addr=0x68;
int16_t AcX, AcY, AcZ, TmP,GyX,GyY,GyZ;
float AcX_calc, AcY_calc, AcZ_calc;
uint32_t lastTime;

// WiFi network info.
const char* SSID = "ssid";
const char* PASS = "wifi pass";

SendEmail e("stmp.gmail.com", 465, "email_account@gmail.com", "password", 5000, true);

#define LED_PIN 14
#define BUTTON_PIN 27

void check_imu(){
  readIMU();
  Serial.print("AcX: "); Serial.print(AcX); Serial.print("g | AcY: "); Serial.print(AcY); Serial.print("g | AcZ: "); Serial.print(AcZ);
  Serial.println("g");
  if(abs(AcX_calc)> 22000 || abs(AcY)> 22000|| abs(AcZ) > 27000){
    Serial.println("Fall detected");
    int button_val = 1;
    lastTime = millis();
    button_val = digitalRead(BUTTON_PIN);
    while(millis()-lastTime<5000){
      button_val = digitalRead(BUTTON_PIN);
      delay(10); //Debounce
      Serial.println(button_val);
      if(!button_val) break;
    }
    if(!button_val){
      Serial.println("Didn't do anything, button was pressed");
      delay(200);
    }
    else{
      alarm();
    }
    delay(50);
  }
  
}

void setup() {
	WiFi.begin(SSID, PASS);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  Wire.begin(4,5);
  Wire.beginTransmission(MPU_addr);
  Wire.write(0x6B);
  Wire.write(0);
  Wire.endTransmission(true);
  Serial.begin(115200);
  Serial.println("Wrote to IMU");
  
}

void loop() {
  int button_state = digitalRead(BUTTON_PIN);
  if(!button_state){
    alarm();
    delay(500);
  }
  check_imu();
}

void readIMU(){
  Wire.beginTransmission(MPU_addr);
  Wire.write(0x3B);  // starting with register 0x3B (ACCEL_XOUT_H)
  Wire.endTransmission(false);
  Wire.requestFrom(MPU_addr,14,true);  // request a total of 14 registers
  AcX=Wire.read()<<8|Wire.read();  // 0x3B (ACCEL_XOUT_H) & 0x3C (ACCEL_XOUT_L)    
  AcY=Wire.read()<<8|Wire.read();  // 0x3D (ACCEL_YOUT_H) & 0x3E (ACCEL_YOUT_L)
  AcZ=Wire.read()<<8|Wire.read();  // 0x3F (ACCEL_ZOUT_H) & 0x40 (ACCEL_ZOUT_L)
  TmP=Wire.read()<<8|Wire.read();  // 0x41 (TEMP_OUT_H) & 0x42 (TEMP_OUT_L)
  GyX=Wire.read()<<8|Wire.read();  // 0x43 (GYRO_XOUT_H) & 0x44 (GYRO_XOUT_L)
  GyY=Wire.read()<<8|Wire.read();  // 0x45 (GYRO_YOUT_H) & 0x46 (GYRO_YOUT_L)
  GyZ=Wire.read()<<8|Wire.read();  // 0x47 (GYRO_ZOUT_H) & 0x48 (GYRO_ZOUT_L)
}

void alarm(){
  Serial.println("Alarm sent!");
  e.send("<email_account@gmail.com>", "<email_to_send@gmail.com>", "ALERT: Fall Detected", "Fall has been detected");
}

sendemail.cpp

C/C++
https://github.com/gpepe/esp8266-sendemail
#include "sendemail.h"

SendEmail::SendEmail(const String& host, const int port, const String& user, const String& passwd, const int timeout, const bool ssl) :
    host(host), port(port), user(user), passwd(passwd), timeout(timeout), ssl(ssl), client((ssl) ? new WiFiClientSecure() : new WiFiClient())
{

}

String SendEmail::readClient()
{
  String r = client->readStringUntil('\n');
  r.trim();
  while (client->available()) r += client->readString();
  return r;
}

bool SendEmail::send(const String& from, const String& to, const String& subject, const String& msg)
{
  if (!host.length())
  {
    return false;
  }
  client->stop();
  client->setTimeout(timeout);
  // smtp connect
#ifdef DEBUG_EMAIL_PORT
  DEBUG_EMAIL_PORT.print("Connecting: ");
  DEBUG_EMAIL_PORT.print(host);
  DEBUG_EMAIL_PORT.print(":");
  DEBUG_EMAIL_PORT.println(port);
#endif
  if (!client->connect(host.c_str(), port))
  {
    return false;
  }
  String buffer = readClient();
#ifdef DEBUG_EMAIL_PORT
  DEBUG_EMAIL_PORT.println(buffer);
#endif
  if (!buffer.startsWith(F("220")))
  {
    return false;
  }
  buffer = F("EHLO ");
  buffer += client->localIP();
  client->println(buffer);
#ifdef DEBUG_EMAIL_PORT
  DEBUG_EMAIL_PORT.println(buffer);
#endif
  buffer = readClient();
#ifdef DEBUG_EMAIL_PORT
  DEBUG_EMAIL_PORT.println(buffer);
#endif
  if (!buffer.startsWith(F("250")))
  {
    return false;
  }
  if (user.length()>0  && passwd.length()>0 )
  {
    buffer = F("AUTH LOGIN");
    client->println(buffer);
#ifdef DEBUG_EMAIL_PORT
  DEBUG_EMAIL_PORT.println(buffer);
#endif
    buffer = readClient();
#ifdef DEBUG_EMAIL_PORT
  DEBUG_EMAIL_PORT.println(buffer);
#endif
    if (!buffer.startsWith(F("334")))
    {
      return false;
    }
    base64 b;
    buffer = user;
    buffer = b.encode(buffer);
    client->println(buffer);
#ifdef DEBUG_EMAIL_PORT
  DEBUG_EMAIL_PORT.println(buffer);
#endif
    buffer = readClient();
#ifdef DEBUG_EMAIL_PORT
  DEBUG_EMAIL_PORT.println(buffer);
#endif
    if (!buffer.startsWith(F("334")))
    {
      return false;
    }
    buffer = this->passwd;
    buffer = b.encode(buffer);
    client->println(buffer);
#ifdef DEBUG_EMAIL_PORT
  DEBUG_EMAIL_PORT.println(buffer);
#endif
    buffer = readClient();
#ifdef DEBUG_EMAIL_PORT
  DEBUG_EMAIL_PORT.println(buffer);
#endif
    if (!buffer.startsWith(F("235")))
    {
      return false;
    }
  }
  // smtp send mail
  buffer = F("MAIL FROM: ");
  buffer += from;
  client->println(buffer);
#ifdef DEBUG_EMAIL_PORT
  DEBUG_EMAIL_PORT.println(buffer);
#endif
  buffer = readClient();
#ifdef DEBUG_EMAIL_PORT
  DEBUG_EMAIL_PORT.println(buffer);
#endif
  if (!buffer.startsWith(F("250")))
  {
    return false;
  }
  buffer = F("RCPT TO: ");
  buffer += to;
  client->println(buffer);
#ifdef DEBUG_EMAIL_PORT
  DEBUG_EMAIL_PORT.println(buffer);
#endif
  buffer = readClient();
#ifdef DEBUG_EMAIL_PORT
  DEBUG_EMAIL_PORT.println(buffer);
#endif
  if (!buffer.startsWith(F("250")))
  {
    return false;
  }
  buffer = F("DATA");
  client->println(buffer);
#ifdef DEBUG_EMAIL_PORT
  DEBUG_EMAIL_PORT.println(buffer);
#endif
  buffer = readClient();
#ifdef DEBUG_EMAIL_PORT
  DEBUG_EMAIL_PORT.println(buffer);
#endif
  if (!buffer.startsWith(F("354")))
  {
    return false;
  }
  buffer = F("From: ");
  buffer += from;
  client->println(buffer);
#ifdef DEBUG_EMAIL_PORT
  DEBUG_EMAIL_PORT.println(buffer);
#endif
  buffer = F("To: ");
  buffer += to;
  client->println(buffer);
#ifdef DEBUG_EMAIL_PORT
  DEBUG_EMAIL_PORT.println(buffer);
#endif
  buffer = F("Subject: ");
  buffer += subject;
  buffer += F("\r\n");
  client->println(buffer);
#ifdef DEBUG_EMAIL_PORT
  DEBUG_EMAIL_PORT.println(buffer);
#endif
  buffer = msg;
  client->println(buffer);
  client->println('.');
#ifdef DEBUG_EMAIL_PORT
  DEBUG_EMAIL_PORT.println(buffer);
#endif
  buffer = F("QUIT");
  client->println(buffer);
#ifdef DEBUG_EMAIL_PORT
  DEBUG_EMAIL_PORT.println(buffer);
#endif
  return true;
}

sendemail.h

C/C++
#ifndef __SENDEMAIL_H
#define __SENDEMAIL_H

//#define DEBUG_EMAIL_PORT

#include <WiFiClient.h>
#include <WiFiClientSecure.h>
#include <base64.h>

class SendEmail
{
  private:
    const String host;
    const int port;
    const String user;
    const String passwd;
    const int timeout;
    const bool ssl;
    WiFiClient* client;
    String readClient();
  public:
   SendEmail(const String& host, const int port, const String& user, const String& passwd, const int timeout, const bool ssl);
   bool send(const String& from, const String& to, const String& subject, const String& msg);
   ~SendEmail() {client->stop(); delete client;}
};

#endif

Credits

Arduino “having11” Guy

Arduino “having11” Guy

82 projects • 539 followers
18 year-old IoT and embedded systems enthusiast. Also an intern at Hackster.io who loves working on projects and sharing knowledge.

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