DFRobot
Gravity: Formaldehyde (HCHO) Sensor (Arduino Raspberry Pi Compatible)
The Formaldehyde (HCHO) sensor is an Arduino & Raspberry Pi compatible module, which is the ideal solution for indoor air quality monitor. This is a H...
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The Formaldehyde (HCHO) sensor is an Arduino & Raspberry Pi compatible module, which is the ideal solution for indoor air quality monitor. This is a HCHO(CH2O) sensor module. It can be used to measure HCHO in air. Through it, you can know the air quality. This sensor module is widely used in many air testing applications, such as indoor air quality, real time quality monitoring stations. Our HCHO sensor module can detect and measure HCHO accurately. Many advantages are available, such as strong anti-jamming capability, high stability, ATC, high sensitivity(up to 0.01ppm) and long life(2 years in air). Integrated with Gravity Interface which is easy to used, wide input voltage, and optional output signal, Our module can be almost compatible with all MCU. According our sample codes , an HCHO detector can be made very quickly. This is a formaldehyde (HCHO) sensor module with small size, and Arduino compatibility. Through it, you can measure the concentration of formaldehyde in air and know the Real-Time air quality. It can be widely used in many air testing applications, such as indoor air quality, real time quality monitoring stations. Applied in a DIY formaldehyde detector is also suitable. The common solution to measure HCHO in air is the reagent or colourimetric card. But this solution will occupy much time, and used only once. And the result is not very accurate and you just know probably. VOC gas sensor is second generation solution. it can detect HCHO roughly, because this sensor only expresses the whole concentration of VOC gas, not just HCHO only. DFRobot Gravity Formaldehyde sensor module can detect and measure HCHO gas concentration accurately. Many advantages are available, such as strong anti-jamming capability, high stability, ATC, high sensitivity(up to 0.01ppm) and long life(2 years in air). It also support 3.3~6V wide range power supply, it means it could be used with Arduino and Raspberry Pi directly. The Formaldehyde monitor integrates with Gravity Interface, easy to use, plug and play. According the sample codes, it is easy to make your own formaldehyde detector. Combined with IOT, it is possible to make an automaic air quality station which can measure HCHO in different sites.
Cautions: 1. When using the sensor module, do not touch the white sensing film. 2. Please keep away from high concentration Hydrogen sulfide, hydrogen, methanol, ethanol, carbon monoxide. These gases will affect the precision and 3. reduce the service life. 4. Please keep the modules warming up for at least 5 minutes when first using. 5. The sensor shall avoid organic solvent, coatings, medicine, oil and high concentration gases 6. Please do not plug the sensor which on the module, and do not modify components on the PCB. 7. Excessive impact or vibration should be avoided. 8. Please do not use the modules in systems which related to human being's safety. 9. Please do not use the modules in strong air convection environment. 10. Please do not expose the modules in high concentration organic gas for a long time.
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Plain-language definitions for the technical terms used above.
- DAC
- A digital-to-analogue converter turns numbers from the microcontroller into a real analogue voltage. It matters if you want to generate simple waveforms, audio-style signals, or variable control voltages rather than just on/off outputs.
- Gravity
- Gravity is DFRobot’s plug-in connector system for sensors, motors and modules, using standard cables to reduce loose jumper wiring. It matters because Gravity-compatible parts can connect directly to these ports, while non-Gravity parts may need adapters or manual wiring.
- IoT
- Short for Internet of Things, meaning physical devices that connect to networks or the internet to send data or be controlled remotely. It matters if you want projects such as connected sensors, remote controls or classroom data-logging activities.
- PCB
- A printed circuit board (PCB) is a board, usually rigid, with etched copper tracks that connect electronic components together without loose wiring. Components are mounted on the board and signals route between them through the copper layout.
- Temperature compensation
- Temperature compensation is when a sensor or instrument adjusts its readings to reduce errors caused by changes in temperature. This matters because a sensor's raw output often drifts as conditions warm or cool, so compensation keeps readings more consistent and accurate over time.
- UART
- UART is a simple asynchronous serial interface that sends data over separate transmit and receive wires, usually labelled TX and RX, with both ends set to the same baud rate. It is a common way for microcontrollers and other serial devices to exchange data.
- VOC
- Volatile organic compounds are gases released from things like paints, cleaners, smoke, and some plastics. A VOC reading helps indicate indoor air quality, but it is usually an index or estimate rather than a direct identification of each chemical.
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SEN0231 formaldehyde detection sensor schematics 1.0
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