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// =========================================================
// Tank Monitor - app.js
// =========================================================
const TANK_FULL_PASSWORD = "1234"; // 🔐 CHANGE THIS
// ===============================
// Fetch sensor data and update UI
// ===============================
async function fetchSensorData() {
try {
const response = await fetch("/sensor");
const data = await response.json();
// Level
const level_mm = data.pressure / 9.810;
document.getElementById("level").innerText =
level_mm.toFixed(3) + " m";
// Pressure
document.getElementById("pressure").innerText =
data.pressure.toFixed(3) + " Kpa";
// Tank % + Liters (robust)
const pct = data.tank_percent;
const capacity = Number(TANK_CAPACITY_L);
const percentEl = document.getElementById("percent");
if (!isNaN(capacity) && capacity > 0) {
const liters = (pct / 100) * capacity;
percentEl.innerText =
`${pct.toFixed(1)} % [${liters.toFixed(0)} L]`;
} else {
percentEl.innerText =
`${pct.toFixed(1)} %`;
}
// CPU temp
document.getElementById("cpu").innerText =
data.cpu_temp.toFixed(1) + " °C";
// RSSI: dBm → %
let rssiPercent = (data.rssi + 100) * 2;
rssiPercent = Math.max(0, Math.min(100, rssiPercent));
document.getElementById("rssi").innerText =
rssiPercent.toFixed(0) + " %";
// Free memory → KB
document.getElementById("mem").innerText =
(data.mem / 1024).toFixed(1) + " KB";
// Uptime
document.getElementById("uptime").innerText =
data.uptime;
updateTankBar(pct);
// Change footer on html page
// data.footer = "Powered by Raspberry Pi Pico W & HX710B - Test"
document.getElementById("footer-text").innerText = data.footer;
} catch (err) {
console.log("Sensor fetch error:", err);
}
}
// ===============================
// Tank animation + color scaling
// ===============================
function updateTankBar(percent) {
const fill = document.getElementById("tank-fill");
percent = Math.max(0, Math.min(100, percent));
fill.style.height = percent + "%";
fill.style.backgroundColor = tankColor(percent);
}
function tankColor(p) {
let r, g, b;
if (p <= 50) {
const t = p / 50;
r = 211 + (251 - 211) * t;
g = 50 + (192 - 50) * t;
b = 47 + (45 - 47) * t;
} else {
const t = (p - 50) / 50;
r = 251 + (76 - 251) * t;
g = 192 + (175 - 192) * t;
b = 45 + (80 - 45) * t;
}
return `rgb(${Math.round(r)}, ${Math.round(g)}, ${Math.round(b)})`;
}
// ===============================
// Date & Time
// ===============================
function updateClock() {
const now = new Date();
document.getElementById("date").innerText =
`${now.getFullYear()}-${String(now.getMonth()+1).padStart(2,"0")}-${String(now.getDate()).padStart(2,"0")}`;
document.getElementById("time").innerText =
`${String(now.getHours()).padStart(2,"0")}:${String(now.getMinutes()).padStart(2,"0")}:${String(now.getSeconds()).padStart(2,"0")}`;
}
// ===============================
// Theme toggle
// ===============================
const modeSwitch = document.getElementById("modeSwitch");
if (localStorage.getItem("theme") === "dark") {
document.body.classList.add("dark");
if (modeSwitch) modeSwitch.checked = true;
}
if (modeSwitch) {
modeSwitch.addEventListener("change", () => {
document.body.classList.toggle("dark", modeSwitch.checked);
localStorage.setItem("theme", modeSwitch.checked ? "dark" : "light");
});
}
// ===============================
// Password-protected Tank Full
// ===============================
function tankFullProtected() {
const entered = prompt("Enter password to set Tank FULL:");
if (entered !== TANK_FULL_PASSWORD) {
alert("❌ Incorrect password");
return;
}
if (!confirm("Confirm: Set tank to FULL?")) return;
fetch("/tare");
}
window.tankFullProtected = tankFullProtected;
// ===============================
// Start
// ===============================
setInterval(fetchSensorData, 1000);
setInterval(updateClock, 1000);
fetchSensorData();
updateClock();

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Tank Monitor</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
/* ======================= */
/* THEME VARIABLES */
/* ======================= */
:root {
--bg: #f4f6f8;
--text: #000;
--card-bg: #ffffff;
--accent: #1976d2;
--tank-bg: #e0e0e0;
--wave: rgba(255,255,255,0.35);
--footer: #555;
}
body.dark {
--bg: #121212;
--text: #e0e0e0;
--card-bg: #1f1f1f;
--accent: #1e88e5;
--tank-bg: #333;
--wave: rgba(255,255,255,0.25);
--footer: #888;
}
body {
font-family: Arial, sans-serif;
background: var(--bg);
color: var(--text);
margin: 0;
padding: 0;
transition: background 0.3s, color 0.3s;
}
/* ======================= */
/* HEADER + THEME SWITCH */
/* ======================= */
.header {
background: var(--accent);
color: white;
padding: 15px;
text-align: center;
font-size: 22px;
position: relative;
}
.theme-toggle {
position: absolute;
right: 20px;
top: 15px;
}
.theme-toggle input {
appearance: none;
width: 50px;
height: 25px;
background: #555;
border-radius: 50px;
cursor: pointer;
position: relative;
transition: background 0.3s;
}
.theme-toggle input:checked {
background: #90caf9;
}
.theme-toggle input::before {
content: "";
position: absolute;
width: 21px;
height: 21px;
background: white;
border-radius: 50%;
top: 2px;
left: 2px;
transition: transform 0.3s;
}
.theme-toggle input:checked::before {
transform: translateX(25px);
}
/* ======================= */
/* CONTAINERS + CARDS */
/* ======================= */
.container {
width: 95%;
max-width: 900px;
margin: auto;
padding-top: 20px;
}
.card {
background: var(--card-bg);
border-radius: 12px;
padding: 20px;
margin-bottom: 20px;
box-shadow: 0 2px 10px rgba(0,0,0,0.25);
transition: background 0.3s;
}
.card h3 {
margin-top: 0;
color: var(--accent);
}
.stats-block p {
margin: 6px 0;
font-size: 16px;
}
.tank-flex-wrapper {
display: flex;
justify-content: space-between;
align-items: center;
gap: 30px;
flex-wrap: wrap;
}
/* ======================= */
/* VERTICAL TANK WAVE */
/* ======================= */
.tank-container {
width: min(100vw, 150px);
height: min(75vh, 250px);
background: var(--tank-bg);
border-radius: 10px;
overflow: hidden;
display: flex;
align-items: flex-end;
box-shadow: inset 0 0 10px rgba(0,0,0,0.6);
transition: width 0.3s, height 0.3s;
}
#tank-fill {
width: 100%;
height: 0%;
background: #4caf50;
position: relative;
transition: height 1s linear, background-color 1s linear;
}
#tank-fill::before,
#tank-fill::after {
content: "";
position: absolute;
left: 0;
width: 200%;
height: 20px;
background: var(--wave);
border-radius: 50%;
animation: wave 3s infinite linear;
}
#tank-fill::before { top: -5px; }
#tank-fill::after {
top: -12px;
opacity: 0.5;
animation-duration: 5s;
}
@keyframes wave {
from { transform: translateX(-50%); }
to { transform: translateX(0%); }
}
/* ======================= */
/* BUTTONS */
/* ======================= */
button {
padding: 12px 20px;
background: #e53935;
color: white;
border: none;
border-radius: 8px;
font-size: 16px;
cursor: pointer;
width: 100%;
}
button:hover {
background: #ff5252;
}
.button-row {
display: flex;
gap: 15px;
}
.button-row button {
width: 100%;
}
@media (max-width: 480px) {
.button-row {
flex-direction: column;
}
}
/* ======================= */
/* FOOTER */
/* ======================= */
.footer {
text-align: center;
margin-top: 30px;
color: var(--footer);
font-size: 12px;
padding-bottom: 30px;
}
/* Mobile tank adjustment */
@media (max-width: 600px) {
.tank-container {
width: 65px;
height: 25vh;
}
}
</style>
<script src="/app.js" defer></script>
</head>
<body>
<div class="header">
Tank Monitor
<label class="theme-toggle">
<input id="modeSwitch" type="checkbox">
</label>
</div>
<div class="container">
<!-- System Stats + Tank -->
<div class="card">
<h3>System Stats</h3>
<div class="tank-flex-wrapper">
<div class="stats-block">
<p><b>Date:</b> <span id="date">--</span></p>
<p><b>Time:</b> <span id="time">--</span></p>
<p><b>Uptime:</b> <span id="uptime">--</span></p>
<p><b>Level:</b> <span id="level">--</span></p>
<p><b>Pressure:</b> <span id="pressure">--</span></p>
<p><b>Tank Level:</b> <span id="percent">--</span></p>
<p><b>CPU Temp:</b> <span id="cpu">--</span></p>
<p><b>WiFi RSSI:</b> <span id="rssi">--</span></p>
<p><b>Free Memory:</b> <span id="mem">--</span></p>
</div>
<div class="tank-container">
<div id="tank-fill"></div>
</div>
</div>
</div>
<!-- Actions -->
<div class="card">
<h3>Actions</h3>
<div class="button-row">
<!-- <button onclick="fetch('/tare')">Tank Full</button> -->
<button onclick="tankFullProtected()">Tank Full</button>
<button onclick="fetch('/calibrate')">Calibrate</button>
</div>
</div>
</div>
<div class="footer" id="footer-text">
Powered by Raspberry Pi Pico W & HX710B
</div>
</body>
</html>