NodeMCU + PIR sensor HC-SR501 + ThingSpeak = Motion Detection alert Via Twitter

To get API keys register at https://thingspeak.com/  and then on its twitter app on https://thingspeak.com/apps/thingtweet

Code

//nodeMCU v1.0 (black) with Arduino IDE

//nodemcu pinout https://github.com/esp8266/Arduino/issues/584

#include <ESP8266WiFi.h>

#include <pins_arduino.h>

#define myPeriodic 15 //in sec | Thingspeak pub is 15sec

long min=0;

int PIRpin = 14;

int PIRvalue=0;

const char* server = "api.thingspeak.com";

String apiKey ="Your-api-key";

String api_key_ts="your-api-key-ts";

const char* MY_SSID = "wifi=ssid"; 

const char* MY_PWD = "password";

int failedCounter = 0;

long lastConnectionTime = 0; 

boolean lastConnected = false;

int sent = 0;

void setup() {

  pinMode(PIRpin, INPUT);

  Serial.begin(115200);

  connectWifi();

}

void loop() {

  PIRvalue=digitalRead(PIRpin);

if (PIRvalue==HIGH){

  Serial.println(String(sent)+"Motion detected ");

  sendMotion(PIRvalue);

  updateTwitterStatus("My thing is social @thingspeak, Motion detected, possible intruder!");

  int count = myPeriodic;

  while(count--)

  delay(1000);}

  else{

    Serial.println(String(sent)+"Motion NOT detected ");

  sendMotion(PIRvalue);

  int count = myPeriodic;

  while(count--)

  delay(1000);}

    

}

void connectWifi()

{

  Serial.print("Connecting to "+*MY_SSID);

  WiFi.begin(MY_SSID, MY_PWD);

  while (WiFi.status() != WL_CONNECTED) {

  delay(1000);

  Serial.print(".");

  }

  

  Serial.println("");

  Serial.println("Connected");

  Serial.println("");  

}//end connect

void sendMotion(int PIRv)

{  

   WiFiClient client;

  

   if (client.connect(server, 80)) { // use ip 184.106.153.149 or api.thingspeak.com

   Serial.println("WiFi Client connected ");

   String postStr = apiKey;

   postStr += "&field1=";

   postStr += String(PIRv);

   postStr += "\r\n\r\n";

   

   client.print("POST /update HTTP/1.1\n");

   client.print("Host: api.thingspeak.com\n");

   client.print("Connection: close\n");

   client.print("X-THINGSPEAKAPIKEY: " + apiKey + "\n");

   client.print("Content-Type: application/x-www-form-urlencoded\n");

   client.print("Content-Length: ");

   client.print(postStr.length());

   client.print("\n\n");

   client.print(postStr);

   delay(1000);

   

   }//end if

   sent++;

 client.stop();

}//end send

void updateTwitterStatus(String tsData)

{

  

  WiFiClient client;

  if (client.connect(server, 80))

  { Serial.println("WiFi Client connected to thingSpeak ");

    // Create HTTP POST Data

    

    min =millis()/(1000);

    tsData = min+tsData;

    tsData = "api_key="+api_key_ts+"&status="+tsData;

            

    client.print("POST /apps/thingtweet/1/statuses/update HTTP/1.1\n");

    client.print("Host: api.thingspeak.com\n");

    client.print("Connection: close\n");

    client.print("Content-Type: application/x-www-form-urlencoded\n");

    client.print("Content-Length: ");

    client.print(tsData.length());

    client.print("\n\n");

    client.print(tsData);

    

    if (client.connected())

    {

      Serial.println("Connecting to ThingSpeak/thingtweet...");

      Serial.println();

      

    }

}

}