++ed by:
BINJOY SREZIC CREDO
1 non-PAUSE user
Author image Gligan Calin Horea
and 1 contributors

NAME

RPi::PIGPIO::Device::MH_Z14 - Read CO2 concentration from a MH-Z14 CO2 module

DESCRIPTION

Use the GPIO serial interface to read the CO2 concentration from a MM-Z14 module

What are safe levels of CO and CO2 in rooms?

  • 250-350ppm Normal background concentration in outdoor ambient air

  • 350-1,000ppm Concentrations typical of occupied indoor spaces with good air exchange

  • 1,000-2,000ppm Complaints of drowsiness and poor air.

  • 2,000-5,000 ppm Headaches, sleepiness and stagnant, stale, stuffy air. Poor concentration, loss of attention, increased heart rate and slight nausea may also be present.

  • 5,000 Workplace exposure limit (as 8-hour TWA) in most jurisdictions.

  • >40,000 ppm Exposure may lead to serious oxygen deprivation resulting in permanent brain damage, coma, even death.

SYNOPSIS

    use RPi::PIGPIO;
    use RPi::PIGPIO::Device::MH_Z14;

    my $pi = RPi::PIGPIO->connect('192.168.1.10');

    my $co2_sensor = RPi::PIGPIO::Device::MH_Z14->new($pi,mode => 'serial', tty => '/dev/ttyAMA0');

    $ppm = $co2_sensor->read();

METHODS

new

Create a new object

Usage:

    my $led = RPi::PIGPIO::Device::MH_Z14->new($pi,mode => 'serial', tty => '/dev/ttyAMA0');

Arguments: $pi - an instance of RPi::PIGPIO %params - Additional params for the sensor

Currently the params must be:

    %params = (mode => 'serial', tty => '<serial port>');

There are aditional modes in with you cand read data from this sensor (pwm and analog output), but this modes are not implemnted yet.

read

Read the CO2 concentration (in ppm - parts per milion)

Usage :

    my $ppm = $sensor->read();