MH410D by NekoSensors

A Python library for interfacing with the MH-410D CO2 sensor via UART.

Sensor Datasheet (+ Protocol) - MH-410D.PDF

Installation

You can install the library via pip:

pip install MH410D

Usage

Here is an example of how to use the MH410D library:

from MH410D import MH410D_CO2

# Create an instance of the sensor
sensor = MH410D_CO2(port='COM3', baudrate=9600, timeout=2)

# Read gas concentration
concentration_ppm = sensor.read_gas_concentration()
if concentration_ppm is not None:
    print(f"Gas concentration: {concentration_ppm} ppm")
    print(f"Gas concentration: {sensor.ppm_to_percent(concentration_ppm)} %")

    # Example conversion to mg/m3 for carbon dioxide (CO2), molar mass 44 g/mol
    concentration_mg_m3 = sensor.ppm_to_mg_m3(concentration_ppm, molar_mass=44)
    print(f"Gas concentration: {concentration_mg_m3} mg/m3")

# Calibrate the sensor
sensor.calibrate_zero()
sensor.calibrate_span()

# Close the connection
sensor.close()

Features

• Read Gas Concentration: Read CO2 concentration in ppm from the MH-410D sensor.
• Calibrate Sensor: Calibrate the zero and span points of the sensor.
• Convert Units: Convert gas concentration from ppm to percentage and mg/m3.

API Reference

MH410D_CO2

__init__(self, port='COM3', baudrate=9600, timeout=2)

Initializes the serial connection with the specified parameters.

• port (str): Port name to which the sensor is connected (default 'COM3').
• baudrate (int): Data transmission speed (default 9600).
• timeout (int): Timeout for read operations (default 2 seconds).

read_gas_concentration(self)

Sends a command to read gas concentration and returns the value.

• Returns: Gas concentration in ppm, or None if reading failed.

calibrate_zero(self)

Sends a command to calibrate the sensor zero point.

• Returns: True if calibration is successful, otherwise False.

calibrate_span(self)

Sends a command to calibrate the sensor span point.

• Returns: True if calibration is successful, otherwise False.

ppm_to_percent(self, ppm)

Converts ppm to percentage.

• ppm (int): Value in ppm.
• Returns: Value in percentage.

ppm_to_mg_m3(self, ppm, molar_mass, temperature=25, pressure=101325)

Converts ppm to mg/m3.

• ppm (int): Value in ppm.
• molar_mass (float): Molar mass of the gas in grams per mole.
• temperature (float): Temperature in degrees Celsius (default 25).
• pressure (float): Pressure in Pascals (default 101325 Pa).
• Returns: Value in mg/m3.

close(self)

Closes the serial connection.

Out Another Projects:

https://github.com/NekoRMD/NekoRMD - Control MyActuator RMD X8-PRO using Python by CAN

https://github.com/K-Lab-Students/REIS_PCB - PBC library