In this tutorial we will see how to make a motion detector system, with a PIR sensor, a relay module, to connect a 110V/220V focus, an esp32 that will connect to our Wifi network and send alert notifications, by messages through the telegram messaging service, when the PIR sensor detects a movement.

Circuit

Electronic components

Cables dupont

ESP32

Features of the ESP32-T module

Connectivity

The ESP32 module has all the wiFi variants:

• 802.11 b/g/n/e/i/n
• Wi-Fi Direct (P2P), P2P Discovery, P2P Group Owner mode and P2P Power Management

This new version includes low-power Bluethoot connectivity

• Bluetooth v4.2 BR/EDR and BLE
• BLE Beacon

In addition, you can communicate using SPI, I2C, UART, MAC Ethernet, Host SD protocols

Microcontroller features

The CPU consists of a Tensilica LX6 Model SoC with the following features and memory

• Dual 32-bit core with 160MHz speed
• 448 kBytes ROM
• 520kByteS SRAM

Have 48 Pins

• 18 12-bit ADC
• 2 8-bit DAC
• 10 pin contact sensors
• 16 PWM
• 20 Digital inputs/outputs

Power and consumption modes

For proper operation of the ESP32 it is necessary to supply a voltage between 2.8V and 3.6V. The energy you consume depends on the mode of operation. It contains a mode, the Ultra Low Power Solution (ULP),in which basic tasks (ADC, PSTN…) continue to be performed in Sleep mode.

A focus

Sensor PIR

Electric pyro devices such as pir have elements made of a crystalline material that generates an electrical charge when exposed to infrared radiation. Changes in the amount of radiation produce voltage changes which are measured by an amplifier. The sensor contains special filters called Fresnel lenses that focus infrared signals on the sensor element. When infrared signals from the environment where the sensor is located change rapidly, the amplifier activates the output to indicate movement. This output remains active for a few seconds allowing the micro controller to know if there was movement.

Calibration When the pir sensor is energized requires a preparation time to start operating properly. This is because adaptation to the conditions of operation of the environment where it was installed has to occur. During this moment the sensor learns to recognize the state of rest or non-movement of the environment. The duration of this calibration can be between 10 and 60 seconds and the absence of people in the sensor neighborhood while calibrating is highly recommended.

Features:

• Infrared sensor with control circuit board.
• Sensitivity and retention time can be adjusted.
• Small and light, it is easy to use.
• Detection distance is up to 6 meters.
• Suitable for security field, toy, control automation, etc.

PIR ROBOX IR sensor features

MarchRoboxModelRTHWColorWhite + GreenMaterialPCB + Plastic boardFeaturesStatic power: 50uA; Detection distance: 7m; Detection angle: 110 degrees; Wide voltage range: DC 4.5 20VApplicationDetect motion

Dimensions: 1.26 x 0.94 in x 0.94 in (3.2 cm x 2.4 cm x 2.4 cm)Weight: 0.25 oz (7 g)

PinOut PIR ROBOX AND

Pines macho

Socket

Relay Module

TECHNICAL SPECIFICATIONS

• Operating Voltage: 5V DC
• Control Signal: TTL (3.3V or 5V)
• Number of Relays (channels): 1 CH
• Max capacity: 10A/250VAC, 10A/30VDC
• Max current: 10A (NO), 5A (NC)
• Action time: 10 ms / 5 ms
• To activate output NO: 0 Volts

Printed Circuit

Gerber file

Gerber_PCB__ESP32

Source

#include <WiFi.h>
#include <WiFiClientSecure.h>
#include <UniversalTelegramBot.h>
#include <ArduinoJson.h>
// Reemplazar con los datos de tu red wifi
const char* ssid = "Tu_red_wifi";
const char* password = "Tu_clave";
//Token de Telegram BOT se obtenienen desde Botfather en telegram
#define token_Bot "Tu_token"
// El ID se obtiene de (IDBot) en telegram no olvidar hacer click en iniciar
#define ID_Chat "Tu_chat_ID"
WiFiClientSecure client;
UniversalTelegramBot bot(token_Bot, client);
const int sensorPIR = 23; // Pin donde está conectada la entrada del sensor PIR
const int luz = 13;// Pin para luz de 110 o 220 V( Con módulo relay)
int conteo = 0;
String mensaje = "";
String conteoString = "";
int PIR = 0;
////Setup////
void setup() {
  Serial.begin(115200);
  // Activamos el resistor de PULLUP para la entrada sensor PIR
  pinMode(sensorPIR, INPUT_PULLUP);
  pinMode(luz, OUTPUT);
  // Intenta conectarse a la red Wifi:
  Serial.print("Conectando a la red wifi... ");
  Serial.println(ssid);
  //Seteo de la red Wifi
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(500);
  }
  Serial.println("");
  Serial.println("Conectado a la red wifi!!!");
  Serial.print("Dirección ip: ");
  Serial.println(WiFi.localIP());//Imprimimos la direción ip local
  bot.sendMessage(ID_Chat, "Sistema preparado!!!", "");//Enviamos un mensaje a telegram para informar que el sistema está listo
}
/////loop//////
void loop() {
   PIR = digitalRead(sensorPIR);//Leemos el estado del del sensor PIR
   //Si es igual a "1" se cumple la condición
  if(PIR == 1){
    digitalWrite(luz, HIGH);//Encendemos la luz
    Serial.println("Luz Encendida!");
      conteo = conteo + 1;//Incremento en el contador de movimientos detectados
    conteoString = String(conteo);//Lo convertimos a una cadena
    mensaje = "Movimiento detectados: " + conteoString;//Concatenamos ambas cadenas
    bot.sendMessage(ID_Chat, mensaje, "");//Enviamos el mensaje a Telegram
    delay(5000);//mantensmos la luz encendida este tiempo
    digitalWrite(luz, LOW);//Luego la apagamos
    Serial.println("Luz apagada!");
    PIR = 0;//Asignamos el valor "0" a la variable PIR para que deje de cumplirse la condición
  }
}

Download Library –> Universal-Arduino-Telegram-Bot-master

Create Bot on Telegram

In telegram we look for BotFather

We write /start and something similar to this will appear to us

Write /newbot

I will see the name of the bot, and we invent a name for our bot, it must be in the format ?usuario_bot?

We’ll get a token that we’re going to use in the source code

Now we’ll look for IDBot, and we’ll start it

We write /getid and it will give us user_id that we should place in the source code

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