# Measure concentration every 5 sec using Arduino

4 views (last 30 days)
Sumit on 8 May 2024
Edited: Hassaan on 9 May 2024
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?

Hassaan on 9 May 2024
Edited: Hassaan on 9 May 2024
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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If you find the solution helpful and it resolves your issue, it would be greatly appreciated if you could accept the answer. Also, leaving an upvote and a comment are also wonderful ways to provide feedback.
It's important to note that the advice and code are based on limited information and meant for educational purposes. Users should verify and adapt the code to their specific needs, ensuring compatibility and adherence to ethical standards.
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