Lock sensor

lock_sensor.ino

#include <ESP8266WiFi.h>

#define SENSORPIN 4 // what pin we’re connected to

// replace with your channel’s thingspeak API key,
String tsApiKey = "ENTER API KEY HERE";
String ddId = "ENTER ID HERE";

const char* ssid = "hackafe.org";
const char* password = "";

const char* tsServer = "api.thingspeak.com";
const char* ddServer = "datadrop.wolframcloud.com";

WiFiClient client;
int val = 0;
int cnt;
String str;

void setup()
{
  Serial.begin(115200);
  Serial.println();

  WiFi.begin(ssid, password);

  Serial.print("Connecting");
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(500);
    Serial.print(".");
  }
  Serial.println();

  Serial.print("Connected, IP address: ");
  Serial.println(WiFi.localIP());

  pinMode(SENSORPIN, INPUT);
}

void loop() {

  val = digitalRead(SENSORPIN);

  Serial.println(val == HIGH ? "Locked" : "Unlocked");


  // datadrop
//  Serial.print("Connecting to ");
//  Serial.print(ddServer);
//  Serial.print("...");
//  if (client.connect(ddServer,80)) { // datadrop.wolframcloud.com
//    Serial.println("connected");
//    String postStr = "bin="+ddId;
//    postStr +="&lock=";
//    postStr += String(val);
//    Serial.println("sending "+postStr);
//
//    client.print("GET /api/v1.0/Add?"+postStr+" HTTP/1.1\n");
//    client.print("Host: datadrop.wolframcloud.com\n");
//    client.print("Connection: close\n");
//    client.print("\n");
//
//    cnt = 0;
//    while (client.connected() && !client.available() && cnt < 5000) {
//      delay(1); //waits for data
//      cnt++;
//    }
//    Serial.print("< ");
//    str = "";
//    while (client.available()) {
//      char c = client.read();
//      str += c;
//    }
//    Serial.println(str);
//  }
//  client.stop();


  // thingspeak
  Serial.print("Connecting to ");
  Serial.print(tsServer);
  Serial.print("...");
  if (client.connect(tsServer,80)) { // "184.106.153.149" or api.thingspeak.com
    Serial.println("connected");
    String postStr = tsApiKey;
    postStr +="&field1=";
    postStr += String(val);
    postStr += "\r\n\r\n";
    Serial.println("sending "+postStr);
    
    client.print("POST /update HTTP/1.1\n");
    client.print("Host: api.thingspeak.com\n");
    client.print("Connection: close\n");
    client.print("X-THINGSPEAKAPIKEY: "+tsApiKey+"\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);

    cnt = 0;
    while (client.connected() && !client.available() && cnt < 10000) {
      delay(1); //waits for data
      cnt++;
    }
    Serial.print("< ");
    str = "";
    while (client.available()) {
      char c = client.read();
      str += c;
    }
    Serial.println(str);
  }
  client.stop();


  
  Serial.println("Waiting...");
  // wait for 60 secs until next report
  delay(30000);
}

Here's an updated version that fixes wolfram data drop and logs when the status changes (in windows of 1 sec)
https://gist.github.com/modlfo/533a8bcd3815ae500478eecfcdf02b59