New Formaldehyde (HCHO) Sensor Module - Gravity Series - Cover Expand

Formaldehyde (HCHO) Sensor Module - Gravity Series

DFRobot DFRobot



This handy HCHO Formaldehyde Sensor Module is built for hobbyists, but offers high sensitivity, a long lifespan and easy integration for Arduino.

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As biological machines made of hundreds of different parts, we’re quite fortunate to have handy senses like touch, taste and smell, as these not only let us enjoy and experience the world around us, but also keep us safe from dangers like predators, spoiled food and even high concentrations of specific gases. However, while our senses are extremely good at what they do, they often can’t be too precise on their measurements, and this is why sometimes we have to call in some extra help from even more sensitive – and completely unbiased – Electronic Sensors for better accuracy, more control and, in some circumstances, more safety for those working in laboratories, workshops and other potentially risky locations.

These Formaldehyde (HCHO) Sensor Modules are designed around the awesome Gravity Series standard from DFRobot, and is built to work with 3.3V to 6V DC microcontrollers like Arduino Boards and other development platforms. It is capable of both DAC and UART output, with a handy onboard toggle switch to choose between these two outputs, and offers an extremely sensitive sensing resolution of as little as 0.01 parts per million, up to 5ppm max. This allows you to create a truly reliable formaldehyde sensing device or system, ensuring even more safety for potentially risky situations, as well as more precision for applications requiring specific levels of HCHO.

If you often work with potentially harmful gases like formaldehyde, or simply enjoy building your own air quality sensing devices for experimentation and fun, it’s always a good idea to invest in some reliable Gas Sensors that you can actually trust. While our noses are certainly good for sensing all kinds of different gases, having an unbiased sensing device that can give you actual numbers will go a long way in keeping you safe from unnecessary harm.


Formaldehyde (HCHO) Sensor Module  -  Technical Specifications:

  • Operating Voltage

– 3.3V to 6V DC                                                         

  • Interfacing Port

Gravity Series 3-Pin

  • Sensing Range

– 0 to 5 ppm

  • Sensing Resolution

– 0.01 ppm

  • Warm Up Time

– ≤3 Minutes

  • Response Time

– ≤60 Seconds

  • Onboard Controls

– DAC/UART Output Toggle Switch

  • Output Signal Options



  • DAC Output

– 0.4V @ 0 ppm | 2V at 5 ppm

  • UART Baud Rate

– 9600

  • Interference Gases

– Alcohol | Methanol | Ethanol | Hydrogen

– CO | H2S | Other High-Concentration Gas

  • Safe Operating Temperatures

– 0° to +50°C

  • Expected Working Life

– 2 Years (Once Exposed to Air)

  • Included Extras

– 1 x Gravity Series 3-Pin Digital Sensor Cable

– 4 x M3x10 Nylon Columns

– 8 x M3x5 Screws

  • Weight

– 22g

  • Dimensions

– 38 x 28 x 15mm


Additional Resources:

  • For more insights and specifics on this awesome sensor module, and to find some handy resources like connection diagrams and example code, check out the official DFRobot HCHO Sensor Wiki.


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As self-proclaimed “Robo-holics”, DFRobot is a company comprised of over 100 staff members, of which 30% are engineers who love to build robots. It was started in 2008 with the goal of embracing and promoting open-source hardware, with a core focus on Arduino, Raspberry Pi and their very own LattePanda development boards. Since then, DFRobot have manufactured over 1300 unique modules, sensors and components that all work together and complement each other, allowing users like us to enjoy a full spectrum of cutting edge robotics and electronics without having to pay premium prices.

With the primary goal of developing and manufacturing great quality products, while making them accessible to as many people as possible, DFRobot are rapidly becoming one of the most common-place brands in the world of open-source robotics and electronics. With more than 1300 products developed in-house, and an impressive range of different categories and specialisations, there are few brands in the world who can compete in terms of quality, accessibility and genuine innovation.