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--- iothings:laboratoare:2025:lab1 [2025/09/25 22:10]
dan.tudose [First Steps]
+++ iothings:laboratoare:2025:lab1 [2025/10/24 21:12] (current)
dan.tudose [Lab 1. WiFi Server]
@@ Line 1: / Line 1: @@
-===== Lab 1: Getting Started ======
+===== Lab 1. Getting Started. WiFi Basics ======
 ===== Necessary gear =====
@@ Line 282: / Line 282: @@
 #include <WebServer.h>
 #include <SPIFFS.h>
+#include <ESPmDNS.h>
 #include <Adafruit_BME680.h>
-#define SEALEVEL_HPA (1019.9f)   // adjust for better altitude accuracy
+#define SEALEVEL_HPA (1013.25f)   // adjust for better altitude accuracy
 // ===== WiFi =====
-const char* WIFI_SSID = "TP-Link_2A64";
+const char* WIFI_SSID = "YOUR_SSID";
-const char* WIFI_PASS = "99481100";
+const char* WIFI_PASS = "YOUR_PASSWORD";
+const char* MDNS_NAME = "sparrow";        // -> http://sparrow.local/
 // ===== Web =====
@@ Line 301: / Line 303: @@
 struct Sample {
-  uint32_t t_ms;   // millis() at sample time
+  uint32_t t_ms;
-  float tC;        // °C
+  float tC;
-  float hPct;      // %
+  float hPct;
-  float pHpa;      // hPa
+  float pHpa;
-  float altM;      // meters
+  float altM;
 };
 Sample hist[HISTORY_MAX];
-size_t histHead = 0;   // next write index
+size_t histHead = 0;
-size_t histCount = 0;  // how many valid samples
+size_t histCount = 0;
 void pushSample(const Sample& s) {
@@ Line 319: / Line 321: @@
 Sample getSampleByAge(size_t iOldToNew) {
-  // iOldToNew: 0=oldest .. histCount-1=newest
   size_t idx = (histHead + HISTORY_MAX - histCount + iOldToNew) % HISTORY_MAX;
   return hist[idx];
@@ Line 328: / Line 329: @@
   Wire.begin(21, 22); // set custom SDA/SCL here if needed: Wire.begin(SDA, SCL);
-  if (bme.begin(0x76, &Wire)) {
+  if (bme.begin(0x76, &Wire)) { Serial.println("[BME680] Found at 0x76"); return true; }
-    Serial.println("[BME680] Found at 0x76");
+  if (bme.begin(0x77, &Wire)) { Serial.println("[BME680] Found at 0x77"); return true; }
-    return true;
-  }
-  if (bme.begin(0x77, &Wire)) {
-    Serial.println("[BME680] Found at 0x77");
-    return true;
-  }
   Serial.println("[BME680] Not found at 0x76/0x77");
   return false;
@@ Line 345: / Line 340: @@
   bme.setPressureOversampling(BME680_OS_4X);
   bme.setIIRFilterSize(BME680_FILTER_SIZE_3);
-  bme.setGasHeater(320, 150); // gas heater on; harmless if gas not used
+  bme.setGasHeater(320, 150); // optional
 }
@@ Line 371: / Line 366: @@
 void handleApiSensor() {
-  // Return the latest reading (take one now if buffer is empty)
   if (histCount == 0) takeAndStoreSample();
   Sample s = (histCount == 0) ? Sample{millis(), NAN, NAN, NAN, NAN}
@@ Line 391: / Line 385: @@
   if (n == 0) { server.send(200, "application/json", "{\"ok\":true,\"n\":0}"); return; }
-  // Build JSON: seconds-ago array + each metric
   String json;
   json.reserve(n * 64 + 128);
   json += "{\"ok\":true,\"n\":" + String(n);
-  // seconds ago
+  // seconds ago array
   json += ",\"s\":[";
   for (size_t i = 0; i < n; ++i) {
@@ Line 407: / Line 400: @@
   auto appendSeries = [&](const char* key, float Sample::*field, int digits) {
-    json += ",\"";
+    json += ",\""; json += key; json += "\":[";
-    json += key;
-    json += "\":[";
     for (size_t i = 0; i < n; ++i) {
       Sample s = getSampleByAge(i);
@@ Line 423: / Line 414: @@
   appendSeries("alt", &Sample::altM, 1);
+  json += "}";
+  server.send(200, "application/json", json);
+}
+void handleApiStatus() {
+  bool up = WiFi.status() == WL_CONNECTED;
+  long rssi = up ? WiFi.RSSI() : -127;   // dBm
+  uint32_t uptimeS = millis() / 1000;
+  String json = "{";
+  json += "\"ok\":true";
+  json += ",\"rssi_dbm\":" + String(rssi);
+  json += ",\"uptime_s\":" + String(uptimeS);
+  json += ",\"hostname\":\"" + String(MDNS_NAME) + "\"";
+  json += ",\"ip\":\"" + (up ? WiFi.localIP().toString() : String("")) + "\"";
   json += "}";
   server.send(200, "application/json", json);
@@ Line 430: / Line 436: @@
   Serial.begin(115200);
   while (!Serial) { delay(10); }
-  Serial.println("\n[BOOT] ESP32-C6 BME680 Web Graphs");
+  Serial.println("\n[BOOT] ESP32-C6 BME680 Web Graphs + Status + mDNS");
   if (!SPIFFS.begin(true)) Serial.println("[SPIFFS] Mount failed");
   else Serial.println("[SPIFFS] Mounted");
-  // WiFi
+  // WiFi + mDNS
   WiFi.mode(WIFI_STA);
   WiFi.setSleep(false);
+  WiFi.setHostname(MDNS_NAME);
   WiFi.begin(WIFI_SSID, WIFI_PASS);
   Serial.printf("[WiFi] Connecting to %s", WIFI_SSID);
@@ Line 448: / Line 455: @@
   if (WiFi.status() == WL_CONNECTED) {
     Serial.printf("[WiFi] Connected. IP: %s\n", WiFi.localIP().toString().c_str());
+    if (MDNS.begin(MDNS_NAME)) {
+      MDNS.addService("http", "tcp", 80);
+      Serial.printf("[mDNS] http://%s.local/\n", MDNS_NAME);
+    } else {
+      Serial.println("[mDNS] start failed");
+    }
   } else {
     Serial.println("[WiFi] Failed to connect (continuing)");
@@ Line 456: / Line 469: @@
   if (haveBME) setupBME680();
-  // Prime buffer with one sample so the page has data immediately
+  // Prime buffer
   takeAndStoreSample();
   // Routes
-  server.on("/", HTTP_GET, handleRoot);
+  server.on("/",           HTTP_GET, handleRoot);
-  server.on("/api/sensor",  HTTP_GET, handleApiSensor);
+  server.on("/api/sensor", HTTP_GET, handleApiSensor);
-  server.on("/api/history", HTTP_GET, handleApiHistory);
+  server.on("/api/history",HTTP_GET, handleApiHistory);
+  server.on("/api/status", HTTP_GET, handleApiStatus);
   server.onNotFound([]() {
@@ Line 478: / Line 492: @@
   Serial.println("[HTTP] Server started");
   if (WiFi.status() == WL_CONNECTED)
-    Serial.println("[HTTP] Open: http://" + WiFi.localIP().toString() + "/");
+    Serial.println("[HTTP] Open: http://" + WiFi.localIP().toString() + "/  or  http://sparrow.local/");
 }
@@ Line 484: / Line 498: @@
   server.handleClient();
-  // Take a sample once per second
+  // 1 Hz sampling
   static uint32_t lastSample = 0;
   uint32_t now = millis();
@@ Line 490: / Line 504: @@
     lastSample = now;
     takeAndStoreSample();
-    // Drop samples older than 5 minutes (optional; ring buffer already caps size)
-    // (kept for clarity if you ever increase HISTORY_MAX)
   }
   delay(2);
 }
 </code>
@@ Line 504: / Line 515: @@
 <code html index.html>
 <!doctype html>
-<html lang="en">
+<html lang="en" data-theme="light">
 <head>
   <meta charset="utf-8"/>
-  <title>ESP32-C6 Sparrow Dashboard</title>
+  <title>BME680 Dashboard</title>
   <meta name="viewport" content="width=device-width, initial-scale=1"/>
   <style>
-    :root { --fg:#222; --muted:#777; --card:#f7f7f7; }
+    :root {
-    body { font-family: system-ui,-apple-system,Segoe UI,Roboto,sans-serif; margin: 16px; color: var(--fg); }
+      --bg:#ffffff; --fg:#222; --muted:#777; --card:#f7f7f7; --axis:#00000066; --grid:#00000012; --line:#0b6;
+    }
+    [data-theme="dark"] {
+      --bg:#0f1115; --fg:#eaeef2; --muted:#9aa4b2; --card:#171a21; --axis:#ffffff66; --grid:#ffffff13; --line:#38bdf8;
+    }
+    html,body { height:100%; }
+    body { background: var(--bg); color: var(--fg);
+           font-family: system-ui,-apple-system,Segoe UI,Roboto,sans-serif; margin: 16px; }
     h1 { margin: 0 0 8px 0; }
     .row { display:flex; gap:16px; flex-wrap:wrap; align-items:baseline; }
@@ Line 521: / Line 539: @@
     canvas { width:100%; height:200px; display:block; }
     .ts { color: var(--muted); margin-top: 8px; font-size:.9rem; }
-    @media (max-width: 700px) { .grid { grid-template-columns: 1fr; } } /* optional: stack on small screens */
+    @media (max-width: 700px) { .grid { grid-template-columns: 1fr; } }
+    /* Toggle + status pill */
+    .topbar { display:flex; justify-content:space-between; align-items:center; margin-bottom:8px; gap:12px; }
+    .toggle { cursor:pointer; padding:6px 10px; border-radius:10px; background:var(--card); border:1px solid #00000010; }
+    .pill { position: sticky; top: 8px; align-self: start; padding:6px 10px; border-radius:999px;
+            background:var(--card); border:1px solid #00000010; color:var(--fg); font-size:.9rem; }
+    .pill a { color: inherit; text-decoration: none; border-bottom:1px dotted var(--muted); }
   </style>
 </head>
 <body>
-  <h1>ESP32-C6 Sparrow Dashboard</h1>
+  <div class="topbar">
+    <h1>BME680 Dashboard (5 min)</h1>
+    <div class="toggle" id="themeToggle">🌙 Dark mode</div>
+  </div>
+  <div class="row" style="margin-bottom:8px;">
+    <div class="pill" id="status">Wi-Fi: -- dBm · Uptime: --:--:-- · <a href="http://sparrow.local" target="_blank" rel="noreferrer">sparrow.local</a></div>
+  </div>
   <div class="row">
     <div><span class="label">Temperature</span> <span id="t" class="metric">--</span></div>
@@ Line 544: / Line 577: @@
 <script>
 const secsWindow = 300; // 5 minutes
 function $(id){ return document.getElementById(id); }
-// Simple helper to choose decimals based on range
+// ---- Theme toggle (persisted) ----
+(function initTheme(){
+  const saved = localStorage.getItem('theme') || 'light';
+  document.documentElement.setAttribute('data-theme', saved);
+  $('themeToggle').textContent = saved === 'dark' ? '☀️ Light mode' : '🌙 Dark mode';
+  $('themeToggle').addEventListener('click', () => {
+    const cur = document.documentElement.getAttribute('data-theme') || 'light';
+    const next = cur === 'dark' ? 'light' : 'dark';
+    document.documentElement.setAttribute('data-theme', next);
+    localStorage.setItem('theme', next);
+    $('themeToggle').textContent = next === 'dark' ? '☀️ Light mode' : '🌙 Dark mode';
+  });
+})();
+// ---- Chart helpers ----
 function decimalsForRange(range){
   if (!isFinite(range) || range <= 0) return 1;
@@ Line 554: / Line 600: @@
   return 0;
 }
-// Draw a line chart with a Y axis (left), ticks, labels
 function drawSeries(canvas, secondsAgo, values, color) {
   const dpr = window.devicePixelRatio || 1;
-  const padL = 48 * dpr, padR = 8 * dpr, padT = 8 * dpr, padB = 18 * dpr; // room for axis/labels
+  const padL = 48 * dpr, padR = 8 * dpr, padT = 8 * dpr, padB = 18 * dpr;
   const ctx = canvas.getContext('2d');
@@ Line 582: / Line 626: @@
   const plotH = h - padT - padB;
-  // Axes
+  // Axes + grid
-  ctx.strokeStyle = 'rgba(0,0,0,0.35)';
+  ctx.strokeStyle = getComputedStyle(document.documentElement).getPropertyValue('--axis').trim();
   ctx.lineWidth = 1 * dpr;
-  // Y axis line
+  ctx.beginPath(); ctx.moveTo(padL, padT); ctx.lineTo(padL, h - padB); ctx.stroke();
-  ctx.beginPath();
+  ctx.beginPath(); ctx.moveTo(padL, h - padB); ctx.lineTo(w - padR, h - padB); ctx.stroke();
-  ctx.moveTo(padL, padT);
-  ctx.lineTo(padL, h - padB);
-  ctx.stroke();
-  // X axis baseline
-  ctx.beginPath();
-  ctx.moveTo(padL, h - padB);
-  ctx.lineTo(w - padR, h - padB);
-  ctx.stroke();
-  // Horizontal grid + Y tick labels (6 ticks)
+  ctx.strokeStyle = getComputedStyle(document.documentElement).getPropertyValue('--grid').trim();
-  ctx.strokeStyle = 'rgba(0,0,0,0.07)';
+  ctx.fillStyle = getComputedStyle(document.documentElement).getPropertyValue('--axis').trim();
-  ctx.fillStyle = 'rgba(0,0,0,0.6)';
+  ctx.textAlign = 'right'; ctx.textBaseline = 'middle';
-  ctx.textAlign = 'right';
-  ctx.textBaseline = 'middle';
   ctx.font = `${12*dpr}px system-ui,-apple-system,Segoe UI,Roboto,sans-serif`;
   for (let i = 0; i <= 5; i++) {
@@ Line 606: / Line 640: @@
     const yVal = yMax - yRange * frac;
     const y = padT + plotH * frac;
-    // grid line
+    ctx.beginPath(); ctx.moveTo(padL, y); ctx.lineTo(w - padR, y); ctx.stroke();
-    ctx.beginPath();
+    ctx.fillText(yVal.toFixed(yDec), padL - 6*dpr, y);
-    ctx.moveTo(padL, y);
-    ctx.lineTo(w - padR, y);
-    ctx.stroke();
-    // label
-    const label = yVal.toFixed(yDec);
-    ctx.fillText(label, padL - 6*dpr, y);
   }
-  // Map data points to plot coords
   const xForSec = s => padL + plotW * (1 - Math.min(s, secsWindow) / secsWindow);
   const yForVal = v => padT + plotH * ((yMax - v) / yRange);
-  // Data line
+  ctx.strokeStyle = color || getComputedStyle(document.documentElement).getPropertyValue('--line').trim();
-  ctx.strokeStyle = color || '#0b6';
   ctx.lineWidth = Math.max(1, 1.5 * dpr);
   ctx.beginPath();
@@ Line 631: / Line 657: @@
   ctx.stroke();
-  // X labels (left=-5m, mid=-2.5m, right=now)
+  // X labels
-  ctx.fillStyle = 'rgba(0,0,0,0.5)';
+  ctx.fillStyle = getComputedStyle(document.documentElement).getPropertyValue('--axis').trim();
-  ctx.textAlign = 'center';
+  ctx.textAlign = 'center'; ctx.textBaseline = 'top';
-  ctx.textBaseline = 'top';
+  const xLabels = [{s:300, txt:'-5m'}, {s:150, txt:'-2.5m'}, {s:5, txt:'now'}];
-  const xLabels = [{s:secsWindow, txt:'-5m'}, {s:secsWindow/2, txt:'-2.5m'}, {s:20, txt:'now'}];
   xLabels.forEach(l=>{
     const x = xForSec(l.s);
@@ Line 642: / Line 667: @@
 }
-async function refresh() {
+// ---- Data refresh ----
+async function refreshHistory() {
   try {
     const r = await fetch('/api/history', {cache:'no-store'});
     const j = await r.json();
     if (!j.ok) { $('ts').textContent = 'No data'; return; }
@@ Line 660: / Line 685: @@
     drawSeries($('ch'), j.s, j.rh, '#17bebb');
     drawSeries($('cp'), j.s, j.p,  '#4a7');
-    drawSeries($('ca'), j.s, j.alt,'#555');
+    drawSeries($('ca'), j.s, j.alt,'#999');
     $('ts').textContent = 'Updated: ' + new Date().toLocaleTimeString();
-  } catch (e) {
+  } catch {
     $('ts').textContent = 'Fetch error';
   }
 }
-refresh();
-setInterval(refresh, 2000);
+function fmtUptime(sec){
+  const h = Math.floor(sec/3600);
+  const m = Math.floor((sec%3600)/60);
+  const s = sec%60;
+  const pad = n => n.toString().padStart(2,'0');
+  return `${pad(h)}:${pad(m)}:${pad(s)}`;
+}
+async function refreshStatus(){
+  try {
+    const r = await fetch('/api/status', {cache:'no-store'});
+    const j = await r.json();
+    const rssi = (j && Number.isFinite(j.rssi_dbm)) ? `${j.rssi_dbm} dBm` : '-- dBm';
+    const up   = (j && Number.isFinite(j.uptime_s)) ? fmtUptime(j.uptime_s) : '--:--:--';
+    $('status').innerHTML = `Wi-Fi: ${rssi} · Uptime: ${up} · <a href="http://${j.hostname||'sparrow'}.local" target="_blank" rel="noreferrer">${j.hostname||'sparrow'}.local</a>`;
+  } catch {
+    $('status').textContent = 'Wi-Fi: -- dBm · Uptime: --:--:-- · sparrow.local';
+  }
+}
+refreshHistory();
+refreshStatus();
+setInterval(refreshHistory, 2000);
+setInterval(refreshStatus, 5000);
 </script>
 </body>
 </html>
 </code>
@@ Line 678: / Line 727: @@
 </note>
-=== 6. Advertise on BLE  ===
-Build the example below, which advertises the board on BLE. Install on your phone an app that scans nearby Bluetooth devices, such as [[https://play.google.com/store/apps/details?id=no.nordicsemi.android.mcp&hl=en&pli=1| nRF Connect]]. Check if your device is in the list.
-<code C main.cpp>
-#include <Arduino.h>
-#include <NimBLEDevice.h>
-static const char* DEVICE_NAME = "ESP32-C6 Demo";
-static NimBLEUUID SERVICE_UUID("6E400001-B5A3-F393-E0A9-E50E24DCCA9E");
-static NimBLEUUID CHAR_UUID   ("6E400002-B5A3-F393-E0A9-E50E24DCCA9E");
-NimBLEServer*         gServer = nullptr;
-NimBLEService*        gService = nullptr;
-NimBLECharacteristic* gChar = nullptr;
-void startBLE() {
-  NimBLEDevice::init(DEVICE_NAME);
-  gServer  = NimBLEDevice::createServer();
-  gService = gServer->createService(SERVICE_UUID);
-  gChar = gService->createCharacteristic(
-    CHAR_UUID,
-    NIMBLE_PROPERTY::READ
-  );
-  gChar->setValue("Hello from ESP32-C6!");
-  gService->start();
-  NimBLEAdvertising* adv = NimBLEDevice::getAdvertising();
-  // Advertise our service UUID
-  adv->addServiceUUID(SERVICE_UUID);
-  // (v2.x) Build advertising + scan-response payloads explicitly
-  NimBLEAdvertisementData advData;
-  advData.setFlags(0x06); // LE General Discoverable + BR/EDR Not Supported
-  NimBLEAdvertisementData scanData;
-  scanData.setName(DEVICE_NAME); // put the name in scan response
-  // you can also add manufacturer data here if you want:
-  // std::string mfg = "\x34\x12C6"; scanData.setManufacturerData(mfg);
-  adv->setAdvertisementData(advData);
-  adv->setScanResponseData(scanData);
-  // Appearance is still supported
-  adv->setAppearance(0x0200); // Generic Tag
-  NimBLEDevice::startAdvertising();
-}
-void setup() {
-  Serial.begin(115200);
-  while (!Serial) { delay(10); }
-  startBLE();
-  Serial.println("Advertising as ESP32-C6 Demo. Open nRF Connect -> Scan.");
-}
-void loop() {
-  delay(1000);
-}
-</code>
-{{:iothings:laboratoare:lab1-ble-scanner.jpg?300|}}
 ===== Resources =====