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
+
+During the quiz round, each student group is provided with a response button (puck), while the teacher operates a central control device (referred to as the "bangle"). When a student presses their group’s puck, the system registers the response time and displays the order in which each group responded—first, second, and so on—on the teacher's bangle screen. This setup ensures a fair and transparent method for determining which team answered first.
+
+## Features
+
+A dashboard where every puck show who press first, second so on..,
+Different Vibration type
+
+## Controls
+
+Bangle button for every new round of quiz
+
+## 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",
+  "icon": "app.png",
+  "version":"0.01",
+  "description": "Quiz buzzer for school student",
+  "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/Buzzerapp/puckjs-code.md

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+const PUCK_NAME = "Puck A"; // Change to "Puck B", "Puck C" on others
+let lastSent = 0;
+
+function sendBuzz() {
+  if (Date.now() - lastSent < 3000) return; // 3s cooldown
+  lastSent = Date.now();
+  let msg = JSON.stringify({ buzz: true, name: PUCK_NAME });
+  Bluetooth.println(msg);
+  LED.set(); setTimeout(() => LED.reset(), 200);
+}
+
+setWatch(sendBuzz, BTN, { edge: "rising", repeat: true, debounce: 50 });
+
+NRF.setAdvertising({}, { name: PUCK_NAME, connectable: true });
+console.log(PUCK_NAME + " ready!");