diff --git a/android/app/src/main/java/com/chatman/helper/BotMessageHelper.java b/android/app/src/main/java/com/chatman/helper/BotMessageHelper.java
index 51e1222b0df5aadb34fc11fb8bf84a15ded7754b..ca95ee2dfa85a2d84dda561ec5dc123b66113270 100644
--- a/android/app/src/main/java/com/chatman/helper/BotMessageHelper.java
+++ b/android/app/src/main/java/com/chatman/helper/BotMessageHelper.java
@@ -38,6 +38,12 @@ public class BotMessageHelper {
                 new WeatherService(context).execute(gps.getLocation());
             }
         }
+        else if (message.toLowerCase().equals("kunci pintu")) {
+            sendBotMessage(context, "Pintu terkunci!");
+        }
+        else if (message.toLowerCase().equals("buka pintu")) {
+            sendBotMessage(context, "Pintu terbuka");
+        }
         else if (message.split(" ", 2)[0].toLowerCase().equals("email")) {
             String arr[] = message.split(" ", 3);
             Intent intent = new Intent(Intent.ACTION_SENDTO);
diff --git a/backend/app.js b/backend/app.js
index 16641cd87e971e893cbc1e538f888add4e78a12b..70652ca0c805959c4a3c8836b10e0275c37cf6c5 100644
--- a/backend/app.js
+++ b/backend/app.js
@@ -5,11 +5,35 @@ const logger = require('morgan');
 const admin = require('firebase-admin');
 const serviceAccount = require('./chatman-a99e6-firebase-adminsdk-e2t5v-36aaaada49.json');
 
+const SerialPort = require('serialport');
+const Readline = require('@serialport/parser-readline');
+const port = new SerialPort('/dev/cu.usbserial-14510', { baudRate: 9600 });
+const parser = port.pipe(new Readline({ delimiter: '\n' }));
+
 const indexRouter = require('./routes/index');
 const usersRouter = require('./routes/users');
 
 const app = express();
 
+let communicateSerial = function(message) {
+  if (message == 'kunci pintu') {
+    port.write('1', (err) => {
+    if (err) {
+      return console.log('Error on write: ', err.message);
+    }
+    console.log('Pintu terkunci');
+  });
+  }
+  else if (message == 'buka pintu') {
+    port.write('0', (err) => {
+    if (err) {
+      return console.log('Error on write: ', err.message);
+    }
+    console.log('Pintu terbuka');
+  });
+  }
+}
+
 admin.initializeApp({
   credential: admin.credential.cert(serviceAccount),
   databaseURL: 'https://chatman-a99e6.firebaseio.com/'
@@ -27,6 +51,7 @@ let message = {
 const db = admin.database();
 let message_db = db.ref('message');
 let chatrooms_db = db.ref('chatroom');
+var idSender = '';
 
 chatrooms_db.on('child_added', chatroom => {
   console.log('chatroom added');
@@ -36,6 +61,11 @@ chatrooms_db.on('child_added', chatroom => {
   chatref.on('value', chatSnap => {
     console.log(chatSnap.val());
     if (chatSnap.val()) {
+      if (chatSnap.child('idReceiver').val() == 'BOT_TOKEN') {
+        communicateSerial(chatSnap.child('message').val().toLowerCase());
+        idSender = chatSnap.child('idSender').val();
+        console.log(idSender);
+      }
       let message = {
         notification: {
           title: chatSnap.child('nameSender').val(),
@@ -56,16 +86,45 @@ chatrooms_db.on('child_added', chatroom => {
   });
 });
 
-
+// Read the port data
+port.on("open", () => {
+  console.log('serial port open');
+});
+parser.on('data', data =>{
+  console.log('got word from arduino:', data);
+  let tanggal = new Date();
+  if (data == 2) {
+    if (idSender) {
+      message_db.push().set({
+        date: {
+          date: tanggal.getDate(),
+          day: tanggal.getDay(),
+          hours: tanggal.getHours(),
+          minutes: tanggal.getMinutes(),
+          month: tanggal.getMonth(),
+          seconds: tanggal.getSeconds(),
+          time: tanggal.getTime(),
+          timezoneOffset: tanggal.getTimezoneOffset(),
+          year: tanggal.getFullYear()
+        },
+        idReceiver: idSender,
+        idSender: "BOT_TOKEN",
+        message: "Ada tamu masuk",
+        nameSender: "ChatMan Bot"
+      });
+    }
+    console.log("Guest masuk");
+  }
+});
 
 app.get('/send', function(req, res) {
   admin.messaging().send(message)
   .then(response => {
-    console.log('Success : ' + response)
+    // console.log('Success : ' + response)
     res.send('success');
   })
   .catch(err => {
-    console.log('Error : ' + err)
+    // console.log('Error : ' + err)
     res.send('error');
   });
 });
@@ -79,8 +138,10 @@ app.use(express.static(path.join(__dirname, 'public')));
 app.use('/', indexRouter);
 app.use('/users', usersRouter);
 
-app.listen(3000, function() {
+app.listen(3001, function() {
   console.log('chatman running at port 3000');
 });
 
+
+
 module.exports = app;
diff --git a/backend/package-lock.json b/backend/package-lock.json
index 872e16d58516b6d39f25ea3b81bd9e62e79ae358..840768852fdaab21c454ee4d651c154eaab060c3 100644
--- a/backend/package-lock.json
+++ b/backend/package-lock.json
@@ -213,6 +213,118 @@
       "resolved": "https://registry.npmjs.org/@protobufjs/utf8/-/utf8-1.1.0.tgz",
       "integrity": "sha1-p3c2C1s5oaLlEG+OhY8v0tBgxXA="
     },
+    "@serialport/binding-abstract": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/@serialport/binding-abstract/-/binding-abstract-2.0.4.tgz",
+      "integrity": "sha512-0ZcSB6Gdxal55R/5McB0O359coXrO/GrmJlZ13cwN67gLsvmhmexCsd8b+H9CQ7dAbLih4HZSbfG9v8crrB0Gg==",
+      "requires": {
+        "debug": "^4.1.0"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        }
+      }
+    },
+    "@serialport/binding-mock": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/@serialport/binding-mock/-/binding-mock-2.0.4.tgz",
+      "integrity": "sha512-7c2dzVwwQIZKk+NFqC1mG0sTAwWR/GJY/4QbTn1Au3TnXhTj8nESYW/dURwsq6dGyl8+ZIPpKlRNu5Pr2tNxAQ==",
+      "requires": {
+        "@serialport/binding-abstract": "^2.0.4",
+        "debug": "^4.1.0"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        }
+      }
+    },
+    "@serialport/bindings": {
+      "version": "2.0.7",
+      "resolved": "https://registry.npmjs.org/@serialport/bindings/-/bindings-2.0.7.tgz",
+      "integrity": "sha512-XNSad/Eh73Dx4gIG8cfwSwUeSznEmjBeaaU5PVAMztwNJrDd9DG0eBvbzxGbBc1ol5RR4sK82I01dCAOjseLAg==",
+      "requires": {
+        "@serialport/binding-abstract": "^2.0.4",
+        "@serialport/parser-readline": "^2.0.2",
+        "bindings": "^1.3.0",
+        "debug": "^4.1.0",
+        "nan": "^2.12.1",
+        "prebuild-install": "^5.2.1"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        }
+      }
+    },
+    "@serialport/parser-byte-length": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/@serialport/parser-byte-length/-/parser-byte-length-2.0.2.tgz",
+      "integrity": "sha512-cUOprk1uRLucCJy6m+wAM4pwdBaB5D4ySi6juwRScP9DTjKUvGWYj5jzuqvftFBvYFmFza89aLj5K23xiiqj7Q=="
+    },
+    "@serialport/parser-cctalk": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/@serialport/parser-cctalk/-/parser-cctalk-2.0.2.tgz",
+      "integrity": "sha512-5LMysRv7De+TeeoKzi4+sgouD4tqZEAn1agAVevw+7ILM0m30i1zgZLtchgxtCH7OoQRAkENEVEPc0OwhghKgw=="
+    },
+    "@serialport/parser-delimiter": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/@serialport/parser-delimiter/-/parser-delimiter-2.0.2.tgz",
+      "integrity": "sha512-zB02LahFfyZmJqak9l37vP/F1K+KCUxd1KQj35OhD1+0q/unMjVTZmsfkxFSM4gkaxP9j7+8USk+LQJ3V8U26Q=="
+    },
+    "@serialport/parser-readline": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/@serialport/parser-readline/-/parser-readline-2.0.2.tgz",
+      "integrity": "sha512-thL26dGEHB+eINNydJmzcLLhiqcBQkF+wNTbRaYblTP/6dm7JsfjYSud7bTkN63AgE0xpe9tKXBFqc8zgJ1VKg==",
+      "requires": {
+        "@serialport/parser-delimiter": "^2.0.2"
+      }
+    },
+    "@serialport/parser-ready": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/@serialport/parser-ready/-/parser-ready-2.0.2.tgz",
+      "integrity": "sha512-6ynQ+HIIkFQcEO2Hrq4Qmdz+hlJ7kjTHGQ1E7SRN7f70nnys1v3HSke8mjK3RzVw+SwL0rBYjftUdCTrU+7c+Q=="
+    },
+    "@serialport/parser-regex": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/@serialport/parser-regex/-/parser-regex-2.0.2.tgz",
+      "integrity": "sha512-7qjYd7AdHUK8fJOmHpXlMRipqRCVMMyDFyf/5TQQiOt6q+BiFjLOtSpVXhakHwgnXanzDYKeRSB8zM0pZZg+LA=="
+    },
+    "@serialport/stream": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/@serialport/stream/-/stream-2.0.4.tgz",
+      "integrity": "sha512-x1OzTGGTA/ioE/wx7sM11KVxkZr5MqZNVTQXezl6wySCl5BkQTj1nc37e99p6aRQjMxAoY8BfIDJKXWwT5LSsA==",
+      "requires": {
+        "@serialport/binding-mock": "^2.0.4",
+        "debug": "^4.1.0"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        }
+      }
+    },
     "@types/caseless": {
       "version": "0.12.1",
       "resolved": "https://registry.npmjs.org/@types/caseless/-/caseless-0.12.1.tgz",
@@ -307,6 +419,49 @@
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
       "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
     },
+    "aproba": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
+      "integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw=="
+    },
+    "are-we-there-yet": {
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz",
+      "integrity": "sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==",
+      "requires": {
+        "delegates": "^1.0.0",
+        "readable-stream": "^2.0.6"
+      },
+      "dependencies": {
+        "isarray": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
+          "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE="
+        },
+        "readable-stream": {
+          "version": "2.3.6",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
+          "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
+          "requires": {
+            "core-util-is": "~1.0.0",
+            "inherits": "~2.0.3",
+            "isarray": "~1.0.0",
+            "process-nextick-args": "~2.0.0",
+            "safe-buffer": "~5.1.1",
+            "string_decoder": "~1.1.1",
+            "util-deprecate": "~1.0.1"
+          }
+        },
+        "string_decoder": {
+          "version": "1.1.1",
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+          "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+          "requires": {
+            "safe-buffer": "~5.1.0"
+          }
+        }
+      }
+    },
     "array-flatten": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
@@ -395,6 +550,52 @@
       "resolved": "https://registry.npmjs.org/bignumber.js/-/bignumber.js-7.2.1.tgz",
       "integrity": "sha512-S4XzBk5sMB+Rcb/LNcpzXr57VRTxgAvaAEDAl1AwRx27j00hT84O6OkteE7u8UB3NuaaygCRrEpqox4uDOrbdQ=="
     },
+    "bindings": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/bindings/-/bindings-1.5.0.tgz",
+      "integrity": "sha512-p2q/t/mhvuOj/UeLlV6566GD/guowlr0hHxClI0W9m7MWYkL1F0hLo+0Aexs9HSPCtR1SXQ0TD3MMKrXZajbiQ==",
+      "requires": {
+        "file-uri-to-path": "1.0.0"
+      }
+    },
+    "bl": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/bl/-/bl-1.2.2.tgz",
+      "integrity": "sha512-e8tQYnZodmebYDWGH7KMRvtzKXaJHx3BbilrgZCfvyLUYdKpK1t5PSPmpkny/SgiTSCnjfLW7v5rlONXVFkQEA==",
+      "requires": {
+        "readable-stream": "^2.3.5",
+        "safe-buffer": "^5.1.1"
+      },
+      "dependencies": {
+        "isarray": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
+          "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE="
+        },
+        "readable-stream": {
+          "version": "2.3.6",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
+          "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
+          "requires": {
+            "core-util-is": "~1.0.0",
+            "inherits": "~2.0.3",
+            "isarray": "~1.0.0",
+            "process-nextick-args": "~2.0.0",
+            "safe-buffer": "~5.1.1",
+            "string_decoder": "~1.1.1",
+            "util-deprecate": "~1.0.1"
+          }
+        },
+        "string_decoder": {
+          "version": "1.1.1",
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+          "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+          "requires": {
+            "safe-buffer": "~5.1.0"
+          }
+        }
+      }
+    },
     "body-parser": {
       "version": "1.18.3",
       "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.18.3.tgz",
@@ -412,11 +613,30 @@
         "type-is": "~1.6.16"
       }
     },
+    "buffer-alloc": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/buffer-alloc/-/buffer-alloc-1.2.0.tgz",
+      "integrity": "sha512-CFsHQgjtW1UChdXgbyJGtnm+O/uLQeZdtbDo8mfUgYXCHSM1wgrVxXm6bSyrUuErEb+4sYVGCzASBRot7zyrow==",
+      "requires": {
+        "buffer-alloc-unsafe": "^1.1.0",
+        "buffer-fill": "^1.0.0"
+      }
+    },
+    "buffer-alloc-unsafe": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/buffer-alloc-unsafe/-/buffer-alloc-unsafe-1.1.0.tgz",
+      "integrity": "sha512-TEM2iMIEQdJ2yjPJoSIsldnleVaAk1oW3DBVUykyOLsEsFmEc9kn+SFFPz+gl54KQNxlDnAwCXosOS9Okx2xAg=="
+    },
     "buffer-equal-constant-time": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/buffer-equal-constant-time/-/buffer-equal-constant-time-1.0.1.tgz",
       "integrity": "sha1-+OcRMvf/5uAaXJaXpMbz5I1cyBk="
     },
+    "buffer-fill": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/buffer-fill/-/buffer-fill-1.0.0.tgz",
+      "integrity": "sha1-+PeLdniYiO858gXNY39o5wISKyw="
+    },
     "buffer-from": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.1.tgz",
@@ -466,6 +686,11 @@
       "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=",
       "optional": true
     },
+    "chownr": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.1.tgz",
+      "integrity": "sha512-j38EvO5+LHX84jlo6h4UzmOwi0UgW61WRyPtJz4qaadK5eY3BTS5TY/S1Stc3Uk2lIM6TPevAlULiEJwie860g=="
+    },
     "cliui": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/cliui/-/cliui-3.2.0.tgz",
@@ -553,6 +778,11 @@
         "xdg-basedir": "^3.0.0"
       }
     },
+    "console-control-strings": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/console-control-strings/-/console-control-strings-1.1.0.tgz",
+      "integrity": "sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4="
+    },
     "content-disposition": {
       "version": "0.5.2",
       "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.2.tgz",
@@ -623,17 +853,35 @@
       "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=",
       "optional": true
     },
+    "decompress-response": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/decompress-response/-/decompress-response-3.3.0.tgz",
+      "integrity": "sha1-gKTdMjdIOEv6JICDYirt7Jgq3/M=",
+      "requires": {
+        "mimic-response": "^1.0.0"
+      }
+    },
     "deep-equal": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/deep-equal/-/deep-equal-1.0.1.tgz",
       "integrity": "sha1-9dJgKStmDghO/0zbyfCK0yR0SLU=",
       "optional": true
     },
+    "deep-extend": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.6.0.tgz",
+      "integrity": "sha512-LOHxIOaPYdHlJRtCQfDIVZtfw/ufM8+rVj649RIHzcm/vGwQRXFt6OPqIFWsm2XEMrNIEtWR64sY1LEKD2vAOA=="
+    },
     "delayed-stream": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
       "integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk="
     },
+    "delegates": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/delegates/-/delegates-1.0.0.tgz",
+      "integrity": "sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o="
+    },
     "depd": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
@@ -644,6 +892,11 @@
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       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
       "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
-      "optional": true,
       "requires": {
         "safe-buffer": "^5.0.1"
       }
@@ -2510,6 +3025,19 @@
       "resolved": "https://registry.npmjs.org/websocket-extensions/-/websocket-extensions-0.1.3.tgz",
       "integrity": "sha512-nqHUnMXmBzT0w570r2JpJxfiSD1IzoI+HGVdd3aZ0yNi3ngvQ4jv1dtHt5VGxfI2yj5yqImPhOK4vmIh2xMbGg=="
     },
+    "which-pm-runs": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/which-pm-runs/-/which-pm-runs-1.0.0.tgz",
+      "integrity": "sha1-Zws6+8VS4LVd9rd4DKdGFfI60cs="
+    },
+    "wide-align": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
+      "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
+      "requires": {
+        "string-width": "^1.0.2 || 2"
+      }
+    },
     "window-size": {
       "version": "0.1.4",
       "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.1.4.tgz",
diff --git a/backend/package.json b/backend/package.json
index 4f80d79139a138877b643976ea303e444427a84d..e8faf69c5b9af2987418607d800af7f3cd3c3241 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -10,6 +10,7 @@
     "debug": "~2.6.9",
     "express": "~4.16.0",
     "firebase-admin": "^7.0.0",
-    "morgan": "~1.9.0"
+    "morgan": "~1.9.0",
+    "serialport": "^7.1.4"
   }
 }