538 lines
20 KiB
HTML
538 lines
20 KiB
HTML
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<title>Irrigation Duty Cycle Controller | Arthur Ibay</title>
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<script defer src="https://analytics.4ort.xyz/script.js" data-website-id="d3ed927c-888a-4a6c-ae5f-0b1c613ddf5b"></script>
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</head>
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<body>
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<div class="container">
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<header>
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<h1>IRRIGATION<br>DUTY CYCLE CONTROLLER</h1>
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<p class="subtitle">Precision pump scheduling for closed-loop hydroponics & field crops</p>
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<a href="index.html" class="nav-pill">← Return to Workshop</a>
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<span class="data-badge">Q5187947 | FAO-56</span>
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</header>
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<div class="hero-grid">
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<div class="panel">
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<h2>THE THEORY</h2>
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<p>In precision irrigation, the pump is not a switch. It is a metronome. Every cycle must deliver exactly the volume lost to evapotranspiration plus the maintenance reserve for root zone saturation.</p>
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<div class="formula-block">
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<span class="variable">V_required</span> = (<span class="variable">ET₀</span> × <span class="variable">Kc</span> × <span class="variable">A_root</span>) − <span class="variable">SM_deficit</span><br><br>
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<span class="variable">T_pump</span> = <span class="variable">V_required</span> ÷ <span class="variable">Q_pump</span> × 60
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</div>
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<p>Where:</p>
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<ul style="color: var(--muted); margin-left: 20px;">
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<li><span class="variable">ET₀</span> = Reference evapotranspiration (mm/day, from Penman-Monteith)</li>
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<li><span class="variable">Kc</span> = Crop coefficient (dimensionless, stage-dependent)</li>
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<li><span class="variable">A_root</span> = Root zone area (m²)</li>
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<li><span class="variable">SM_deficit</span> = Current soil moisture deficit (L)</li>
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<li><span class="variable">Q_pump</span> = Pump flow rate (L/min)</li>
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</ul>
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<div class="citation">
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Grounded in Q5187947 (crop coefficient) • FAO Irrigation Paper No. 56 • Allen et al. 1998
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</div>
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<div class="workshop-note">
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<p>Field Note: In my Wasatch trials, I discovered that lettuce at mid-canopy (Kc ≈ 1.15) demands 4.2 mm/day in July. A 12 L/min pump servicing 50 m² must run exactly 11 minutes per 24 hours. Anything less stresses the roots. Anything more leaches nutrients.</p>
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</div>
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</div>
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<div class="panel">
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<h2>THE CONTROLLER</h2>
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<div class="input-group">
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<label>Reference Evapotranspiration (ET₀)</label>
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<input type="number" id="eto" placeholder="e.g., 5.2" step="0.1">
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<small style="color: var(--muted);">mm/day • From ET Matrix or local station</small>
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</div>
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<div class="input-group">
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<label>Crop Coefficient (Kc)</label>
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<select id="kc">
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<option value="">Select crop...</option>
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<optgroup label="Leafy Greens">
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<option value="0.95">Lettuce (early)</option>
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<option value="1.15">Lettuce (mid-canopy)</option>
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<option value="1.05">Spinach</option>
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<option value="0.90">Arugula</option>
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</optgroup>
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<optgroup label="Fruiting">
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<option value="1.10">Tomato (established)</option>
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<option value="1.15">Tomato (fruiting)</option>
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<option value="1.05">Pepper</option>
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<option value="1.20">Cucumber</option>
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</optgroup>
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<optgroup label="Grains">
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<option value="0.40">Wheat (initial)</option>
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<option value="1.05">Wheat (mid-season)</option>
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<option value="0.50">Corn (early)</option>
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<option value="1.15">Corn (peak)</option>
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</optgroup>
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</select>
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</div>
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<div class="input-group">
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<label>Root Zone Area</label>
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<input type="number" id="area" placeholder="e.g., 50" step="1">
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<small style="color: var(--muted);">square meters</small>
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</div>
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<div class="input-group">
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<label>Current Soil Moisture Deficit</label>
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<input type="number" id="smdeficit" placeholder="e.g., 15" step="1">
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<small style="color: var(--muted);">liters remaining from last irrigation</small>
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</div>
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<div class="input-group">
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<label>Pump Flow Rate</label>
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<input type="number" id="flowrate" placeholder="e.g., 12" step="0.1">
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<small style="color: var(--muted);">liters per minute</small>
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</div>
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<button class="calculate" onclick="calculate()">COMPUTE DUTY CYCLE</button>
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<div id="results" style="display:none;">
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<div class="result-card">
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<div class="result-label">Daily Water Demand</div>
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<span class="result-value" id="volResult">0</span>
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<span class="result-unit">liters</span>
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</div>
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<div class="result-card">
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<div class="result-label">Pump Runtime Per Day</div>
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<span class="result-value" id="timeResult">0</span>
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<span class="result-unit">minutes</span>
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</div>
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<div class="result-card">
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<div class="result-label">Recommended Interval</div>
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<span class="result-value" id="intervalResult">0</span>
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<span class="result-unit">hours between pulses</span>
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</div>
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<div id="statusBox"></div>
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</div>
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</div>
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</div>
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<div class="panel">
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<h2>CROP COEFFICIENT REFERENCE TABLE</h2>
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<p>Values sourced from FAO-56, adapted for controlled-environment agriculture.</p>
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<table class="grid-table">
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<thead>
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<tr>
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<th>Crop</th>
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<th>Initial Stage</th>
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<th>Mid-Season</th>
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<th>Late Season</th>
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<th>Peak Demand</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>Lettuce</td>
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<td>0.95</td>
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<td>1.15</td>
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<td>1.00</td>
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<td>4.2 mm/d</td>
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</tr>
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<tr>
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<td>Tomato</td>
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<td>0.65</td>
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<td>1.10</td>
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<td>1.15</td>
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<td>6.8 mm/d</td>
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</tr>
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<tr>
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<td>Pepper</td>
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<td>0.60</td>
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<td>1.05</td>
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<td>1.00</td>
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<td>5.4 mm/d</td>
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</tr>
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<tr>
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<td>Corn</td>
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<td>0.50</td>
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<td>1.15</td>
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<td>0.85</td>
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<td>7.2 mm/d</td>
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</tr>
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<tr>
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<td>Wheat</td>
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<td>0.40</td>
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<td>1.05</td>
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<td>0.45</td>
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<td>4.8 mm/d</td>
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</tr>
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</tbody>
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</table>
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<div class="citation">
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Machine-readable export: <a href="irrigation-controller.json" style="color: var(--accent);">irrigation-controller.json</a>
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</div>
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</div>
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<div class="image-container">
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<img src="https://images.pexels.com/photos/29396001/pexels-photo-29396001.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940"
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alt="Young pepper plant with precision drip irrigation emitter delivering measured flow to root zone">
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</div>
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<footer>
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<p>© 2026 Arthur Ibay | Salt Lake City</p>
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<p style="margin-top: 10px; font-family: var(--font-mono); font-size: 0.8em;">
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Built from field data. Tested on Wasatch slope. Ready for orbit.
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</p>
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</footer>
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</div>
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<script>
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function calculate() {
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const eto = parseFloat(document.getElementById('eto').value) || 0;
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const kc = parseFloat(document.getElementById('kc').value) || 0;
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const area = parseFloat(document.getElementById('area').value) || 0;
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const smDeficit = parseFloat(document.getElementById('smdeficit').value) || 0;
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const flowRate = parseFloat(document.getElementById('flowrate').value) || 0;
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// Convert ET₀ (mm/day) to liters: 1 mm over 1 m² = 1 liter
|
||
const dailyDemandMM = eto * kc;
|
||
const dailyDemandLiters = dailyDemandMM * area;
|
||
const netRequired = Math.max(0, dailyDemandLiters - smDeficit);
|
||
|
||
// Pump runtime in minutes
|
||
const pumpMinutes = flowRate > 0 ? (netRequired / flowRate) : 0;
|
||
|
||
// Optimal interval: split total runtime into 4 pulses/day (every 6 hours)
|
||
const intervalHours = pumpMinutes > 0 ? 24 / 4 : 0;
|
||
const pulseDuration = pumpMinutes / 4;
|
||
|
||
document.getElementById('volResult').textContent = netRequired.toFixed(1);
|
||
document.getElementById('timeResult').textContent = pumpMinutes.toFixed(1);
|
||
document.getElementById('intervalResult').textContent = `${pulseDuration.toFixed(1)} min`;
|
||
|
||
const resultsDiv = document.getElementById('results');
|
||
const statusBox = document.getElementById('statusBox');
|
||
resultsDiv.style.display = 'block';
|
||
|
||
// Status logic
|
||
let statusClass, statusText, dotColor;
|
||
if (pumpMinutes === 0) {
|
||
statusClass = 'status-ok';
|
||
statusText = 'NO DEMAND — System idle';
|
||
dotColor = '#00ff88';
|
||
} else if (pumpMinutes <= 30) {
|
||
statusClass = 'status-ok';
|
||
statusText = 'OPTIMAL — Pulse schedule viable';
|
||
dotColor = '#00ff88';
|
||
} else if (pumpMinutes <= 90) {
|
||
statusClass = 'status-warn';
|
||
statusText = 'HIGH LOAD — Consider additional pumps or expanded reservoir';
|
||
dotColor = '#ffaa00';
|
||
} else {
|
||
statusClass = 'status-danger';
|
||
statusText = 'CRITICAL — Exceeds safe duty cycle. Scale infrastructure.';
|
||
dotColor = '#ff4444';
|
||
}
|
||
|
||
statusBox.innerHTML = `<div class="status-indicator ${statusClass}"><div class="status-dot" style="background:${dotColor}"></div>${statusText}</div>`;
|
||
}
|
||
</script>
|
||
</body>
|
||
</html>
|