owonb41t/multimeter.html at main · PBrunot/owonb41t · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="utf-8" />
    <title>Owon B41T+ with web bluetooth example</title>
    <script src="./dist/bt-owon-bt.js"></script>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css"
        integrity="sha384-QWTKZyjpPEjISv5WaRU9OFeRpok6YctnYmDr5pNlyT2bRjXh0JMhjY6hW+ALEwIH" crossorigin="anonymous">
    <script src="https://cdn.jsdelivr.net/npm/chart.js@4.4.6/dist/chart.umd.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/chartjs-adapter-date-fns@3.0.0/dist/chartjs-adapter-date-fns.bundle.min.js"></script>
</head>

<body>
    <style>
        .output {
            background-color: #f0f0f0;
            border-radius: 0.75em;
            display: block;
            margin: 0.5em;
            padding: 0.5em;
        }

        .status {
            background-color: #b0b0b0;
            border-radius: 0.75em;
            display: block;
            margin: 0.5em;
            padding: 0.5em;
        }

        #status {
            margin: .5em 0;
            font-style: italic;
        }

        #log {
            margin: .5em 0;
            white-space: pre-wrap;
        }

        #status:empty,
        #log:empty,
        #content:empty {
            display: none;
        }

        .highlight {
            border-radius: 0.75em;
            border: 1px solid #f0f0f0;
            display: block;
            margin: 0.5em;
            overflow-x: auto;
            padding: 0.5em;
        }

        code {
            font-family: Inconsolata, Consolas, monospace;
        }

        .lcd-container {
            margin: 1rem 0;
            padding: 1rem;
            background-color: #2a2a2a;
            border-radius: 0.5rem;
            text-align: center;
        }

        .status-container {
            display: flex;
            align-items: center;
            gap: 1rem;
            margin: 1rem 0;
        }

        .btn-group {
            gap: 0.5rem;
        }

        .multimeter-image {
            max-width: 100%;
            height: auto;
        }
    </style>
    <header class="container mt-3">
        <h1>Owon B41T+ Multimeter</h1>
    </header>
    <div class="container">
        <div class="row">
            <div class="col">
                <p>
                    This webpage uses Web Bluetooth to get real-time readings from your Owon multimeter. A
                    Bluetooth 4.0+ capable device is required.
                </p>
                <ol>
                    <li>Enable Bluetooth on your multimeter first.</li>
                    <li>Click START and select "BDM" or "LILLIPUT" device when prompted.</li>
                    <li>Measurements will be displayed below in real-time.</li>
                </ol>
                <div class="status-container">
                    <strong>Status:</strong>
                    <div id="status" class="status">Disconnected</div>
                </div>
                <div class="btn-group d-flex gap-2 mb-3" role="group" aria-label="Multimeter controls">
                    <button id="btnStart" class="btn btn-success">START</button>
                    <button id="btnStop" class="btn btn-danger">STOP</button>
                    <button id="btnDebugLog" class="btn btn-info">ENABLE DEBUG</button>
                </div>
                <strong>Latest data:</strong>
                <div id="measure" class="output"></div>
                <!-- LCD Display Container -->
                <div id="lcd-container" class="lcd-container"></div>

                <!-- Plugin Script -->
                <script src="./dist/lcd.js"></script>
            </div>
            <div class="col">
                <img src="dmm.png" alt="Owon B41T+ Digital Multimeter" class="multimeter-image" />
            </div>
            <div class="col">
                <strong>Statistics:</strong>
                <div id="stats" class="output"></div>
                <details>
                    <summary><strong>Developer Information</strong></summary>
                    <p><small>Check Developer Tools console for detailed logs.</small></p>
                    <ul>
                        <li><code>OwonBT.SetLogLevel(0-5)</code> - Adjust logging (0=TRACE, 5=SILENT)</li>
                        <li><code>OwonBT.SetPacketLog(true)</code> - Enable packet logging to localStorage</li>
                    </ul>
                </details>
                <div class="alert alert-warning mt-3" role="alert">
                    <strong>Note:</strong> With auto-range active, the meter may send inconsistent data during range transitions.
                    For consistent results, disable auto-range on your multimeter.
                </div>
            </div>
        </div>
    </div>
    <section class="container mt-4">
        <h2>Real-time Chart</h2>
        <div class="chart-container" style="position: relative; height: 400px;">
            <canvas id="myChart" aria-label="Multimeter measurements over time"></canvas>
        </div>
    </section>
    <script>
        // Global variables
        let myChart = null;
        let lcd = null;

        // Initialize LCD display
        function initializeLCD() {
            try {
                const lcdContainer = document.getElementById("lcd-container");
                if (lcdContainer && typeof LCD !== 'undefined') {
                    lcd = new LCD({
                        elem: lcdContainer,
                        rows: 1,
                        columns: 10,
                        pixelSize: 4,
                        pixelColor: "#00ff00"
                    });
                    lcd.writeString({ string: "READY", offset: 0 });
                } else {
                    console.warn('LCD library not available or container not found');
                }
            } catch (error) {
                console.error('Failed to initialize LCD:', error);
            }
        }


        async function updateGraph(chartData) {
            if (!chartData || chartData.length === 0) return;

            try {
                const data = {
                    datasets: [{
                        label: chartData[0]?.Function || 'Measurement',
                        backgroundColor: 'rgba(54, 162, 235, 0.2)',
                        borderColor: 'rgb(54, 162, 235)',
                        data: chartData.map(item => ({
                            x: item.Timestamp,
                            y: item.Value
                        })),
                        fill: false,
                        tension: 0.1
                    }]
                };

                const config = {
                    type: 'line',
                    data: data,
                    options: {
                        responsive: true,
                        maintainAspectRatio: false,
                        scales: {
                            x: {
                                type: 'time',
                                time: {
                                    unit: 'second',
                                    displayFormats: {
                                        second: 'HH:mm:ss'
                                    }
                                },
                                title: {
                                    display: true,
                                    text: 'Time'
                                }
                            },
                            y: {
                                beginAtZero: false,
                                title: {
                                    display: true,
                                    text: 'Value'
                                }
                            }
                        },
                        plugins: {
                            legend: {
                                display: true
                            }
                        }
                    }
                };

                if (myChart === null) {
                    const ctx = document.getElementById('myChart');
                    if (ctx) {
                        myChart = new Chart(ctx, config);
                    }
                } else {
                    myChart.data = data;
                    myChart.update('none');
                }
            } catch (error) {
                console.error('Failed to update chart:', error);
            }
        }

    </script>
    <script>
        // Application state
        let chartData = [];
        let lastData = null;
        let previousData = null;
        let isDebugEnabled = false;

        function updateStatus() {
            try {
                const statusElement = document.getElementById("status");
                const statsElement = document.getElementById("stats");
                const measureElement = document.getElementById("measure");

                if (!OwonBT || !OwonBT.btState) {
                    statusElement.textContent = "Library not loaded";
                    return;
                }

                statusElement.textContent = OwonBT.btState.state || "Unknown";

                // Format stats for better readability
                const stats = OwonBT.btState.stats || {};
                statsElement.innerHTML = Object.entries(stats)
                    .map(([key, value]) => `<strong>${key}:</strong> ${value}`)
                    .join('<br/>');

                if (OwonBT.btState.formattedResponse) {
                    const timestamp = OwonBT.btState.parsedResponse?.DateTime || new Date();
                    measureElement.innerHTML = `
                        ${OwonBT.btState.formattedResponse}
                        <br/><small class="text-muted">(${timestamp})</small>
                    `;

                    updateLCDDisplay();
                    processNewMeasurement();
                } else {
                    measureElement.innerHTML = '<span class="text-muted">No data available</span>';
                    lastData = null;
                }
            } catch (error) {
                console.error('Error updating status:', error);
            }
        }

        function updateLCDDisplay() {
            if (!lcd || !OwonBT.btState.parsedResponse) return;

            try {
                lcd.clearScreen();
                if (OwonBT.btState.parsedResponse.Overload) {
                    lcd.writeString({ string: "OL", offset: 0 });
                } else {
                    const measurement = OwonBT.btState.parsedResponse.Measurement;
                    const displayValue = measurement.toFixed(4).toString().padStart(10, " ");
                    lcd.writeString({ string: displayValue, offset: 0 });
                }
            } catch (error) {
                console.error('Error updating LCD:', error);
            }
        }

        function processNewMeasurement() {
            const currentData = OwonBT.btState.parsedResponse;
            if (!currentData) return;

            let isNewSample = false;

            if (!previousData || currentData.Timestamp.getTime() !== previousData.Timestamp.getTime()) {
                if (!previousData || previousData.Function !== currentData.Function) {
                    chartData = []; // Reset chart on function change
                }
                previousData = currentData;
                isNewSample = true;
            }

            lastData = currentData;

            if (isNewSample) {
                chartData.push({
                    Value: currentData.Overload ? null : currentData.Value,
                    Timestamp: currentData.Timestamp.getTime(),
                    Function: currentData["Function description"]
                });

                // Keep only last 75 data points
                if (chartData.length > 75) {
                    chartData.shift();
                }

                updateGraph(chartData);
            }
        }
        // Event handlers
        async function handleStart() {
            try {
                document.getElementById("btnStart").disabled = true;
                await OwonBT.Start();
            } catch (error) {
                console.error('Failed to start:', error);
                alert('Failed to start connection. Please check console for details.');
            } finally {
                document.getElementById("btnStart").disabled = false;
            }
        }

        async function handleStop() {
            try {
                document.getElementById("btnStop").disabled = true;
                await OwonBT.Stop();
                if (lcd) {
                    lcd.clearScreen();
                    lcd.writeString({ string: "STOPPED", offset: 0 });
                }
            } catch (error) {
                console.error('Failed to stop:', error);
            } finally {
                document.getElementById("btnStop").disabled = false;
            }
        }

        function toggleDebugLog() {
            try {
                isDebugEnabled = !isDebugEnabled;
                OwonBT.SetLogLevel(isDebugEnabled ? 1 : 3);
                const btn = document.getElementById("btnDebugLog");
                btn.textContent = isDebugEnabled ? "DISABLE DEBUG" : "ENABLE DEBUG";
                btn.className = isDebugEnabled ? "btn btn-warning" : "btn btn-info";
            } catch (error) {
                console.error('Failed to toggle debug:', error);
            }
        }

        // Initialize application
        function initializeApp() {
            initializeLCD();

            // Set up event listeners
            document.getElementById("btnStart").addEventListener('click', handleStart);
            document.getElementById("btnStop").addEventListener('click', handleStop);
            document.getElementById("btnDebugLog").addEventListener('click', toggleDebugLog);

            // Start status updates
            setInterval(updateStatus, 450);
        }

        // Start when DOM is loaded
        if (document.readyState === 'loading') {
            document.addEventListener('DOMContentLoaded', initializeApp);
        } else {
            initializeApp();
        }
    </script>

</body>

</html>