---
title: 'Node-RED: вентиляция по CO₂'
tags:
  - family
  - home
  - automation
  - nodered
  - ventilation
updated: '2026-05-17'
---

Node-RED flow для управления вентиляцией по данным CO₂ датчиков.

## Структура

```
[room demand msgs]
      ↓
(1) Demand Aggregator
      ↓
(2) Intake Allocation
      ↓
(3) Discretization per damper
      ↓
(4) Intake Damper Outputs
      ↓
(5) Exhaust Arbitration
      ↓
(6) Exhaust Dampers
      ↓
(7) Exhaust Fans
      ↓
(8) Kitchen Hood
```

## 1. Demand Aggregator (stateful)

```js
let demands = flow.get("room_demands") || {};
demands[msg.room] = msg.raw_demand;
flow.set("room_demands", demands);
msg.demands = demands;
return msg;
```

## 2. Intake Allocation

Комнаты с intake дамперами: bedroom, kids, living. Приоритеты: living = 1.2, остальные = 1.0.

```js
const ROOMS = ["bedroom", "kids", "living"];
const PRIORITY = { bedroom: 1.0, kids: 1.0, living: 1.2 };
let weighted = {}, sum = 0;
for (let r of ROOMS) {
  let d = msg.demands[r] || 0;
  weighted[r] = d * (PRIORITY[r] || 1);
  sum += weighted[r];
}
if (sum === 0) return null;
let allocation = {};
for (let r of ROOMS) { allocation[r] = 100 * weighted[r] / sum; }
msg.intake_pct = allocation;
return msg;
```

## 3. Discretization

**Bedroom/Kids** (0 / 33 / 66 / 100):
```js
function snap(x) {
  if (x < 10) return 0;
  if (x < 33) return 33;
  if (x < 66) return 66;
  return 100;
}
msg.payload = snap(msg.payload);
return msg;
```

**Living (dual-damper)**:
```js
let p = msg.payload;
let A = 0, B = 0;
if (p < 10) { A=0; B=0; }
else if (p < 30) { A=66; B=0; }
else if (p < 55) { A=66; B=66; }
else if (p < 80) { A=100; B=66; }
else { A=100; B=100; }
msg.damperA = A; msg.damperB = B;
return msg;
```

## 5. Exhaust Arbitration

```js
let d = msg.demands;
msg.exhaust = {
  at2_1: Math.max(d.toilet || 0, d.shower || 0, d.kitchen || 0),
  at2_2: Math.max(d.bathroom || 0, d.office || 0)
};
return msg;
```

## 7. Fan Speed

```js
function speed(d) {
  if (d < 5) return 30;
  if (d < 20) return 50;
  if (d < 40) return 70;
  return 100;
}
msg.payload = speed(msg.payload);
return msg;
```

## 8. Kitchen Hood (3-speed)

```js
let d = msg.demands.kitchen || 0;
if (d < 10) msg.payload = 0;
else if (d < 30) msg.payload = 1;
else if (d < 60) msg.payload = 2;
else msg.payload = 3;
return msg;
```

Gate: current_state (manual override → block automation).

Все дамперы: rate-limit 1 msg / 30–60 s.

## Связанные заметки

- [[family/how-to/home-automation]] — общая автоматизация дома