This board will be a Generic MEMS Gas Sensor Hat, which can support up to 3 sensors. We could use this for detecting air quality in a Bathroom (Methane), Testing for alcohol consumption like a breathalyzer, or measuring CO2

The board, fully assembled and working!

Arduino Test Code:

// Define analog pins for each sensor
const int H2_PIN = A2;    // Hydrogen sensor
const int H2S_PIN = A1;   // Hydrogen sulfide sensor
const int CH4_PIN = A0;   // Methane sensor

void setup() {
  // Initialize serial communication
  Serial.begin(9600);
  
  // Set up I2C power pin
  pinMode(6, OUTPUT);
  digitalWrite(6, HIGH);
}

void loop() {
  // Read raw values from sensors
  int h2Reading = analogRead(H2_PIN);
  int h2sReading = analogRead(H2S_PIN);
  int ch4Reading = analogRead(CH4_PIN);
  
  // Print values in format for Serial Plotter
  // Label:Value pairs will show up as different lines in the plotter
  Serial.print("H2:");
  Serial.print(h2Reading);
  Serial.print(",");
  Serial.print("H2S:");
  Serial.print(h2sReading);
  Serial.print(",");
  Serial.print("CH4:");
  Serial.println(ch4Reading);
  
  // Small delay to prevent overwhelming the serial connection
  delay(100);
}

This code was one-shot by Claude 3.5 Sonnet

The program will take the readings on the A0, A1, and A2 pins, and graph them to the serial plotter.