Buzzerapp

apps/Buzzerapp/ChangeLog

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+0.01: New App

apps/Buzzerapp/README.md

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+# Buzzerapp
+
+Basically it use with puckjs for specially Quize round in school where student have to press the puck and Bangle show on it screen that who press first, second like... that
+Main aim through this app is need to aware about the student how technology simply is working back side of this regular daily usage devices
+## Usage
+
+Specially in Quize round in school where student have to press the puck and Bangle show on it screen that who press first, second like that..
+Teacher have a one bangle and other group of student have a one puck each in group.
+
+## Features
+
+A dashboard where every puck show who press first, second....
+Different Vibration type
+
+## Controls
+
+Bangle button for every new round of quize
+
+## Requests
+
+BK7175
+
+## Creator
+
+Brijesh

apps/Buzzerapp/app.js

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+Bluetooth.setConsole(false);
+g.clear();
+g.setFont("6x8", 2);
+
+let buzzedList = [];
+
+// Decode DataView to string (safe for BLE characteristic)
+function decodeBLEString(dataView) {
+  let s = "";
+  for (let i = 0; i < dataView.byteLength; i++) {
+    s += String.fromCharCode(dataView.getUint8(i));
+  }
+  return s;
+}
+
+// Display buzzed order
+function updateDisplay() {
+  g.clear();
+  g.drawString("📋 Buzz Order:", 10, 10);
+  buzzedList.forEach((name, i) => {
+    g.drawString((i + 1) + ". " + name, 10, 30 + i * 20);
+  });
+  if (buzzedList.length === 0) {
+    g.drawString("Waiting for buzzers...", 10, 50);
+  }
+}
+
+// Feedback for buzzed-in
+function alertForRank(rank) {
+  if (rank === 0) {
+    Bangle.buzz(500);
+    Bangle.beep();
+    setTimeout(() => Bangle.beep(), 200);
+  } else {
+    Bangle.buzz(150);
+  }
+}
+
+// Scan for Puck.js devices one by one
+function scanForBuzzers() {
+  NRF.requestDevice({ filters: [{ namePrefix: "Puck" }], timeout: 20000 })
+    .then(device => device.gatt.connect()
+      .then(gatt => gatt.getPrimaryService("6e400001-b5a3-f393-e0a9-e50e24dcca9e"))
+      .then(service => service.getCharacteristic("6e400003-b5a3-f393-e0a9-e50e24dcca9e"))
+      .then(characteristic => {
+        characteristic.on('characteristicvaluechanged', event => {
+          let value = decodeBLEString(event.target.value);
+          try {
+            let msg = JSON.parse(value);
+            if (msg.buzz && msg.name && !buzzedList.includes(msg.name)) {
+              buzzedList.push(msg.name);
+              alertForRank(buzzedList.length - 1);
+              updateDisplay();
+            }
+          } catch (e) {
+            print("Parse error:", value);
+          }
+
+          // Disconnect safely after receiving
+          let device = characteristic.device;
+          if (device && device.gatt && device.gatt.connected) {
+            device.gatt.disconnect();
+          }
+          setTimeout(scanForBuzzers, 1000);
+        });
+        return characteristic.startNotifications();
+      })
+    )
+    .catch(err => {
+      print("Scan/connect failed:", err);
+      setTimeout(scanForBuzzers, 2000);
+    });
+}
+
+// Button on Bangle to reset round
+setWatch(() => {
+  buzzedList = [];
+  updateDisplay();
+  scanForBuzzers();
+}, BTN, { repeat: true, edge: "rising", debounce: 50 });
+
+// Start initial scan
+updateDisplay();
+scanForBuzzers();

apps/Buzzerapp/metadata.json

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+{ "id": "Buzzerapp",
+  "name": "Buzzer APP",
+  "shortName":"Bapp",
+  "icon": "app.png",
+  "version":"0.01",
+  "description": "This is my buzzer app",
+  "tags": "tool",
+  "supports" : ["BANGLEJS", "BANGLEJS2"],  
+  "readme": "README.md",
+  "storage": [
+    {"name":"Buzzerapp.app.js","url":"app.js"},
+    {"name":"Buzzerapp.img","url":"app-icon.js","evaluate":true}
+  ]
+}

apps/watchface

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+