Fermion MEMS Gas Detection Sensor Hydrogen Sulfide (H2S)

Fermion MEMS Gas Detection Sensor Hydrogen Sulfide (H2S) Documentation

Overview

The Fermion MEMS Gas Detection Sensor Hydrogen Sulfide (H2S) is a micro-electromechanical systems (MEMS) based gas sensor designed to detect hydrogen sulfide (H2S) in the air. It offers high sensitivity, fast response time, and low power consumption, making it suitable for a wide range of applications, including industrial process control, environmental monitoring, and HVAC systems.

Technical Specifications

Sensing Gas: Hydrogen Sulfide (H2S)
 Measurement Range: 0-100 ppm
 Sensitivity: 0.1 ppm
 Response Time: <30 seconds
 Operating Temperature: -20C to 50C
 Operating Humidity: 20% to 80% RH
 Power Supply: 3.3V to 5V
 Interface: I2C
 Package: SMD (Surface Mount Device)

Code Examples

### Example 1: Basic H2S Concentration Measurement using Arduino

This example demonstrates how to use the Fermion MEMS Gas Detection Sensor Hydrogen Sulfide (H2S) with an Arduino board to measure the H2S concentration in the air.

```c++
#include <Wire.h>

#define H2S_SENSOR_ADDRESS 0x20 // I2C address of the H2S sensor

void setup() {
  Wire.begin(); // Initialize I2C interface
  Serial.begin(9600); // Initialize serial communication
}

void loop() {
  uint16_t h2s_concentration = readH2SConcentration();
  Serial.print("H2S Concentration: ");
  Serial.print(h2s_concentration);
  Serial.println(" ppm");
  delay(1000); // Take a reading every 1 second
}

uint16_t readH2SConcentration() {
  Wire.beginTransmission(H2S_SENSOR_ADDRESS);
  Wire.write(0x00); // Select the H2S concentration register
  Wire.endTransmission();
  Wire.requestFrom(H2S_SENSOR_ADDRESS, 2);
  uint16_t h2s_concentration = Wire.read() << 8 | Wire.read();
  return h2s_concentration;
}
```

### Example 2: H2S Detection with Raspberry Pi and Python

This example demonstrates how to use the Fermion MEMS Gas Detection Sensor Hydrogen Sulfide (H2S) with a Raspberry Pi board running Python to detect H2S and trigger an alarm when the concentration exceeds a certain threshold.

```python
import smbus
import time

H2S_SENSOR_ADDRESS = 0x20
THRESHOLD = 10  # ppm

bus = smbus.SMBus(1)  # Initialize I2C interface

while True:
    h2s_concentration = read_h2s_concentration()
    print(f"H2S Concentration: {h2s_concentration} ppm")
    if h2s_concentration > THRESHOLD:
        print("H2S detected! Alarm triggered.")
    time.sleep(1)

def read_h2s_concentration():
    bus.write_byte(H2S_SENSOR_ADDRESS, 0x00)  # Select the H2S concentration register
    time.sleep(0.1)  # Wait for the sensor to respond
    data = bus.read_i2c_block_data(H2S_SENSOR_ADDRESS, 0x00, 2)
    h2s_concentration = (data[0] << 8) | data[1]
    return h2s_concentration
```

### Example 3: H2S Monitoring with ESP32 and MicroPython

This example demonstrates how to use the Fermion MEMS Gas Detection Sensor Hydrogen Sulfide (H2S) with an ESP32 board running MicroPython to monitor H2S concentrations and send alerts to a remote server using Wi-Fi.

```python
import machine
import utime
import ujson
import urequests

H2S_SENSOR_ADDRESS = 0x20
WIFI_SSID = "your_wifi_ssid"
WIFI_PASSWORD = "your_wifi_password"
SERVER_URL = "https://your_server_url.com/monitor_h2s"

i2c = machine.I2C(sda=machine.Pin(21), scl=machine.Pin(22))  # Initialize I2C interface

def connect_wifi():
    wifi = machine.WLAN(machine.WLAN_STA)
    wifi.active(True)
    wifi.connect(WIFI_SSID, WIFI_PASSWORD)
    while not wifi.isconnected():
        utime.sleep(1)
    print("Wi-Fi connected!")

def read_h2s_concentration():
    i2c.writeto(H2S_SENSOR_ADDRESS, bytearray([0x00]))  # Select the H2S concentration register
    utime.sleep(0.1)  # Wait for the sensor to respond
    data = i2c.readfrom(H2S_SENSOR_ADDRESS, 2)
    h2s_concentration = (data[0] << 8) | data[1]
    return h2s_concentration

def send_alert(h2s_concentration):
    data = {"h2s_concentration": h2s_concentration}
    headers = {"Content-type": "application/json"}
    response = urequests.post(SERVER_URL, headers=headers, data=ujson.dumps(data))
    if response.status_code == 200:
        print("Alert sent successfully!")

connect_wifi()

while True:
    h2s_concentration = read_h2s_concentration()
    print(f"H2S Concentration: {h2s_concentration} ppm")
    if h2s_concentration > 10:  # ppm
        send_alert(h2s_concentration)
    utime.sleep(60)  # Take a reading every 1 minute
```

Note: In these examples, the I2C address, Wi-Fi credentials, and server URLs may need to be modified to match your specific setup.