Measure concentration every 5 sec using Arduino

I have an Arduino setup with a gas sensor connected. Currently, I have programmed it to activate a buzzer when the gas concentration surpasses a threshold of 200 parts per million (ppm). However, I want the buzzer to sound continuously as long as the gas concentration remains above this threshold. Also, I'd like the Arduino to take readings from the sensor every five seconds instead of the default. How can I modify the code to achieve these requirements?

Answer 1

[Hassaan]

An initial idea:

% Connect to Arduino
a = arduino('COM3', 'Uno'); % Update 'COM3' with your actual COM port
sensorPin = 'A0'; % Gas sensor connected to A0
buzzerPin = 'D12'; % Buzzer connected to D12
configurePin(a, buzzerPin, 'DigitalOutput');

% Define the threshold for gas concentration
threshold = 200; % 200 ppm

% Main loop to read gas concentration and control buzzer
while true
    % Read gas concentration from the sensor
    voltage = readVoltage(a, sensorPin);
    ppm = voltageToPpm(voltage); % Convert voltage to ppm (implement this conversion based on your sensor specifics)

    % Check if the gas concentration exceeds the threshold
    if ppm > threshold
        writeDigitalPin(a, buzzerPin, 1); % Turn on the buzzer
    else
        writeDigitalPin(a, buzzerPin, 0); % Turn off the buzzer
    end
    
    % Wait for 5 seconds before the next reading
    pause(5);
end

function ppm = voltageToPpm(voltage)
    % Conversion from voltage to ppm (this function needs to be defined based on your sensor's characteristics)
    % This is just a placeholder function. You will need to replace it with the actual conversion logic
    % specific to your gas sensor.
    ppm = voltage * 100; % Example conversion, replace with actual
end

MATLAB vs. Arduino IDE: While MATLAB is great for simulation and initial testing, for a permanent, low-cost setup, transitioning this code to the Arduino IDE would be more practical and efficient.

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