CO2 Sensor

Digital

input

Small RAM

0.4.5

#Description

This sensor is able to detect the CO2 particles in the air.

Unfortunately the CO2 sensor is currently not supported in combination with the Arduino MKR WiFi 1010 board.

This component requires 2 pins.

#Links

Open Wiki for Grove ComponentGet the Grove Component

#Units

• Percent%
• Parts per Millionppm

#Functions

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#JavaScript / Node.js

@blokdots/components on npm ↗

ClassCO2Sensorextends ComponentBase

CO2 Sensor component for reading CO2 concentration from Grove MH-Z16 sensor. This is a UART component that communicates via SoftwareSerial (RX/TX pins).

#Constructor options

Option	Type	Required	Description
rxPin	string	required	—
txPin	string	required	—

#Events

Event	Parameters	Description
change	ppm: number	—

#Methods

get value→ number | undefinedfrom ComponentBase

Get the current value of the component.

#Example

JavaScript

import { Board, CO2Sensor } from "@blokdots/components";

const board = new Board("/dev/ttyACM0");
await board.open();

const cO2Sensor = new CO2Sensor({ board, rxPin: "D5", txPin: "D5" });

cO2Sensor.on("change", (value) => {
  console.log("CO2Sensor changed:", value);
});

---

#C++ (Arduino)

ClassCO2Sensorextends ComponentBase

Grove CO2 Sensor (MH-Z16) — UART mode (Seeed) - Baud: 9600 - Read command: FF 01 86 00 00 00 00 00 CS - Response: 9 bytes * CO2 ppm = data[2] * 256 + data[3] Emits ONE event: - evtChanged : when ppm changes enough (threshold + optional rate limit) Output: - ppm() / emittedValue() -> last emitted CO2 concentration

#Required libraries

• #include <SoftwareSerial.h> — SoftwareSerial

#Setup

C++

#include "blokdots.h"

CO2Sensor myComponent(eventBus, 5, 5, MY_EVENT);

#Constructor

CO2Sensor(bus, rxPin, txPin, evtChanged, sampleIntervalMs, minEmitIntervalMs, changeThresholdPpm)

Parameter	Type	Default
bus	EventBus	required
rxPin	uint8_t	required
txPin	uint8_t	required
evtChanged	uint8_t	required
sampleIntervalMs	uint16_t	1000
minEmitIntervalMs	uint16_t	0
changeThresholdPpm	int	1

#Methods

ppm()→ int

emittedValue()→ int

rawPpm()→ int

Optional: most recent parsed sample (may be newer than last emit)