Automated Aquarium System

{
  "name": "Automated Aquarium System",
  "nodes": [
    {
      "id": "ads_ph",
      "type": "ads1x15",
      "name": "pH Probe (ADS1115)",
      "chip": "ADS1115",
      "address": "0x48",
      "channel": 0,
      "gain": 1,
      "interval": 10,
      "x": 120,
      "y": 140
    },
    {
      "id": "voltage_to_ph",
      "type": "function",
      "name": "Voltage to pH",
      "func": "// pH probe calibration: pH = 7 + (2.5 - voltage) / 0.18\n// Adjust offset and slope after calibrating with buffer solutions\nvar voltage = msg.payload.value;\nvar phValue = 7.0 + (2.5 - voltage) / 0.18;\nphValue = Math.round(phValue * 100) / 100;\nmsg.payload = {\n  ph: phValue,\n  voltage: Math.round(voltage * 1000) / 1000,\n  timestamp: Date.now()\n};\nmsg.topic = 'aquarium/ph';\nreturn msg;",
      "x": 340,
      "y": 140
    },
    {
      "id": "ph_check",
      "type": "switch",
      "name": "pH Safe Range?",
      "property": "payload.ph",
      "rules": [
        { "t": "lt", "v": 6.5 },
        { "t": "btwn", "v": 6.5, "v2": 7.5 },
        { "t": "gt", "v": 7.5 }
      ],
      "x": 560,
      "y": 140
    },
    {
      "id": "ph_alert_low",
      "type": "function",
      "name": "pH LOW Alert",
      "func": "msg.payload = {\n  content: '\u26a0\ufe0f **Aquarium pH Alert**\npH is too LOW: ' + msg.payload.ph + '\nTarget range: 6.5 - 7.5\nAction: Check CO2 injection or add buffer.'\n};\nreturn msg;",
      "x": 760,
      "y": 80
    },
    {
      "id": "ph_alert_high",
      "type": "function",
      "name": "pH HIGH Alert",
      "func": "msg.payload = {\n  content: '\u26a0\ufe0f **Aquarium pH Alert**\npH is too HIGH: ' + msg.payload.ph + '\nTarget range: 6.5 - 7.5\nAction: Check for ammonia or add driftwood.'\n};\nreturn msg;",
      "x": 760,
      "y": 200
    },
    {
      "id": "discord_alert",
      "type": "discord",
      "name": "Discord Webhook",
      "webhookUrl": "https://discord.com/api/webhooks/YOUR_WEBHOOK_ID/YOUR_WEBHOOK_TOKEN",
      "x": 980,
      "y": 140
    },
    {
      "id": "schedule_feed_am",
      "type": "schedule",
      "name": "Feed 8:00 AM",
      "cron": "0 8 * * *",
      "payload": "feed",
      "x": 120,
      "y": 320
    },
    {
      "id": "schedule_feed_pm",
      "type": "schedule",
      "name": "Feed 6:00 PM",
      "cron": "0 18 * * *",
      "payload": "feed",
      "x": 120,
      "y": 400
    },
    {
      "id": "servo_feed",
      "type": "function",
      "name": "Servo Feed Sequence",
      "func": "// Rotate servo to 90 degrees to dispense food\n// then return to 0 after 2 seconds\nvar open = { payload: 90 };\nvar close = { payload: 0 };\nsetTimeout(function() {\n  node.send(close);\n}, 2000);\nreturn open;",
      "x": 340,
      "y": 360
    },
    {
      "id": "pwm_servo",
      "type": "pwm",
      "name": "Feeder Servo",
      "pin": 18,
      "frequency": 50,
      "mode": "servo",
      "x": 560,
      "y": 360
    },
    {
      "id": "inject_light",
      "type": "inject",
      "name": "Every 1 Min",
      "interval": 60,
      "x": 120,
      "y": 520
    },
    {
      "id": "brightness_curve",
      "type": "function",
      "name": "Sunrise/Sunset Curve",
      "func": "// Simulate sunrise 7AM-9AM and sunset 7PM-9PM\n// Returns 0-100 brightness value\nvar now = new Date();\nvar hour = now.getHours() + now.getMinutes() / 60;\nvar brightness = 0;\n\nif (hour >= 7 && hour < 9) {\n  // Sunrise ramp: 0% at 7AM to 100% at 9AM\n  brightness = Math.round(((hour - 7) / 2) * 100);\n} else if (hour >= 9 && hour < 19) {\n  // Full daylight\n  brightness = 100;\n} else if (hour >= 19 && hour < 21) {\n  // Sunset ramp: 100% at 7PM to 0% at 9PM\n  brightness = Math.round(((21 - hour) / 2) * 100);\n} else {\n  // Night\n  brightness = 0;\n}\n\nmsg.payload = brightness;\nmsg.topic = 'aquarium/light';\nreturn msg;",
      "x": 340,
      "y": 520
    },
    {
      "id": "pwm_led",
      "type": "pwm",
      "name": "LED Strip",
      "pin": 12,
      "frequency": 1000,
      "mode": "duty",
      "range": 100,
      "x": 560,
      "y": 520
    },
    {
      "id": "debug_ph",
      "type": "debug",
      "name": "pH Monitor",
      "x": 560,
      "y": 60
    },
    {
      "id": "debug_light",
      "type": "debug",
      "name": "Light Monitor",
      "x": 560,
      "y": 600
    }
  ],
  "connections": [
    { "from": "ads_ph", "to": "voltage_to_ph" },
    { "from": "voltage_to_ph", "to": "ph_check" },
    { "from": "voltage_to_ph", "to": "debug_ph" },
    { "from": "ph_check", "to": "ph_alert_low", "fromPort": 0 },
    { "from": "ph_check", "to": "ph_alert_high", "fromPort": 2 },
    { "from": "ph_alert_low", "to": "discord_alert" },
    { "from": "ph_alert_high", "to": "discord_alert" },
    { "from": "schedule_feed_am", "to": "servo_feed" },
    { "from": "schedule_feed_pm", "to": "servo_feed" },
    { "from": "servo_feed", "to": "pwm_servo" },
    { "from": "inject_light", "to": "brightness_curve" },
    { "from": "brightness_curve", "to": "pwm_led" },
    { "from": "brightness_curve", "to": "debug_light" }
  ]
}