Fermion: MEMS HCHO Sensor (breakout) Wiki - DFRobot

Introduction

Fermion: MEMS HCHO sensor employs state-of-the-art microelectromechanical system (MEMS) technology, endowing the sensor with compact dimensions (13x13x2.5mm), low power consumption (<20mA), minimal heat generation, short preheating time, and swift response recovery. This sensor qualitatively measures the concentration of formaldehyde gas, making it suitable for applications in air purifiers, HVAC systems, smart wearables, portable detectors, and more. The MEMS series currently encompasses 11 different types of gas sensors (HCHO, CO, CH4, VOC, NH3, H2S, EtOH, Smoke, Odor, H2, NO2), which can be combined as per specific requirements. Please note: This sensor is capable of qualitative measurements only. For quantitative measurements, kindly consider purchasing the Factory-calibrated Gas Sensor.

Precautions for use

• To prevent exposure to volatile silicon compounds vapors (such as silicone adhesive, hair gel, silicone rubber, or other locations where volatile silicon compounds are present).
• Avoid exposure to high concentrations of corrosive gases (such as H2S, SOX, Cl2, HCl, etc.).
• Prevent contamination from alkalis, alkali metal salts, and halogens.
• Refrain from prolonged exposure to extreme environments (such as high temperatures, high humidity, high pollution).
• Avoid contact with water, condensation, and freezing.
• Minimize excessive vibration, impact, and dropping.
• Please refrain from employing this module in systems that involve personal safety concerns.
• For extended periods of non-usage, it is advisable to preheat the module for at least 24 hours.

Other Mems Gas Sensors

Features

• Compact size, measuring only 13*13*2.5mm
• Low power consumption, minimal heat generation, operating current <20mA
• High sensitivity and rapid response recovery
• Advanced MEMS technology

Specification

• Gas detected: HCHO
• Detection range: 0-3ppm
• Operating voltage: 3.3-5V
• Operating current: <20mA
• Output signal: Analog voltage
• Load resistance（RL）：10KΩ
• Sensitivity: R0(in air)/Rs(in 0.4ppm HCHO) ≥ 1.8
• Operating temperature: -10-50℃
• Operating humidity: 15-90%RH (non-condensing)
• Lifespan: ≥3 years (in air)
• Dimension：13×13 x 2.5mm/0.0.51×0.51x0.1”

Board Overview

Tutorial

NOTE: The module needs to be warmed up for more than 5 minutes when powered on for the first time. It is recommended to warm up for more than 24 hours if it has not been used for a long time.

Requirements

• Hardware
  • DFRduino UNO R3 (or similar) x 1
  • MEMS Gas Sensor x 1
  • Jumper wires

• Software
  • Arduino IDE

Connection Diagram

Sample Code

1.Read the sensor raw value

int sensorPin = A0;
int sensorValue = 0;

void setup()
{
  Serial.begin(9600); //Set serial baud rate to 9600 bps
}

void loop()
{
  sensorValue = analogRead(sensorPin);
  Serial.println(sensorValue);
  delay(100);
}

Expected Results

Open the serial port monitor and get the original value of the sensor.

More Documents

• Schematics & Dimension
• Characteristic Parameter