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Introduction
In various environments such as public places around us, at work, and at home, we can catch the new coronavirus infection through coughing, sneezing, and breathing. (COVID-19) Viruses and bacteria such as Carbon dioxide in people infected with the virus (CO 2) Because the virus is also spitting out at the same time as spitting out CO 2 Concentration can also be an indicator of viruses present in the air. Therefore, in a closed room CO 2 If the concentration is high, it can also be expressed as a high risk of viral infection.
In order to avoid such infection risks, there has been a recent demand for avoidance of the three Cs and adequate indoor ventilation. CO 2 A concentration index is provided, and for judgment of the index CO 2 A measuring instrument is used.
In this article, CO 2 Used in measuring instruments, etc. CO 2 Sensors can be easily evaluated SENSIRION company SCD4x CO 2 I actually tried using the gadget, so I will introduce it.
I actually touched the CO2 gadget!
I actually got the SCD4x CO 2 gadget and touched how it can be used.
First, take out the CO 2 gadget from the box.
Hey, it's small! !
As for the size, it is very compact at 53 x 19 x 13mm.
There was a USB conversion connector that plugs into an outlet nearby, so I arranged it.
I think that you can understand the smallness even if you compare them side by side.
Figure 1. Comparison of SCD4x CO2 gadget and wall outlet type USB conversion connector
This SCD4x CO2 gadget is a reference design circuit board that allows you to easily evaluate the superior performance and ease of use of the SENSIRION CO2 sensor SCD4x products.
USB power supply can be used, and it will start working just by inserting the connector part into the USB port!
Figure 2. Connection to PC's USC port
again, CO 2 Gadgets have CO 2 Indicate indoor air quality with color based on concentration measurement results LED is installed.
CO 2 according to concentration LED The color changes, 1000 ppm green if less than 1000 ~ 1600ppm in yellow, 1600ppm If it is higher, it will change to red.
At the top of the housing, CO 2 to capture SENSIRION company logo "S. It is also a point that there is a slit that imitates "!
Confirmation of CO2 concentration
Next, I would like to actually check the CO 2 concentration.
You can check the CO 2 concentration from the smartphone app.
First, download "MyAmbience" from the iOS or Android application download page. You can jump to the download page from the QR code below.
Android application download link: https://play.google.com/store/apps/details?id=com.sensirion.myam
iOS application download link: https://apps.apple.com/app/sensirion-myambience/id1529131572
Figure 4. MyAmbience app download QR code
To connect the CO2 gadget to your smartphone and view the CO2 concentration in the app, your smartphone must have the MyAmbience app installed and Bluetooth enabled.
the app is Bluetooth mode is enabled by default, so USB to the port CO 2 Connect your gadget, open the app, and CO 2 Gadgets will appear automatically.
Accurate CO2 concentration and history can be read from the app once the connection is established.
* CO 2 To work with gadgets, Bluetooth 4.0 Must be greater than or equal to
At the time of writing the article, it was 791ppm, which is an acceptable CO2 concentration!
Introducing SCD4x
The CO 2 gadget introduced this time is equipped with SENSIRION 's CO 2 sensor SCD4x.
The SCD4x is the world's first built-in PAS (photoacoustic) CO 2 sensor, and has features such as space-saving, surface-mounting that can reduce manufacturing costs, and low power consumption that can be assumed to be battery-powered. Product.
Space saving
Conventional board-mounted CO 2 sensors use an optical mechanism such as the NDIR method, and the longer the distance between the light emitting part and the light receiving part, the higher the accuracy, so the module size is limited to ensure accuracy. had gone out. However, by adopting the photoacoustic method, the SCD4x has achieved a very small module size of 10.1 x 10.1 x 6.5mm.
surface mount
In general, NDIR-type CO 2 sensor modules are mounted using pin headers, which cannot be mechanically mounted using a mounter, resulting in high manufacturing costs. , can be mechanically mounted, reducing manufacturing costs.
Low power consumption
In the NDIR method, infrared light is emitted during CO 2 concentration measurement and power consumption increases, making it difficult to install in battery-powered products. A 10-minute cycle measurement is expected to run for about six and a half years with four AA batteries.
Summary
It is becoming a familiar indicator, CO 2 Concentration can be easily measured CO 2 I tried moving gadgets.
This gadget is SCD4x gadget for evaluation SCD4x It is very simple and easy to use in order to easily check the operation of. At SENSIRION CO 2 As a sensor for concentration measurement, NDIR method of SCD30,semiconductor CO 2 A photoacoustic system that has succeeded in miniaturization as a sensor SCD4x said CO 2 We provide sensors.
the current, CO 2 If you are considering developing a terminal using sensors, please take this opportunity. CO 2 Grab your gadget CO 2 How about measuring the concentration?
SENSIRION company CO 2 If you want to know more about the sensor, please refer to the link below. Also, CO 2 The gadget also publishes circuit diagram information, so it is possible to refer to it during mass production. If you are interested, please contact us from the link below.
Inquiry / Quotation
If you are interested or have any questions, please contact us.
In addition, we have installed SENSIRION's high-reliability environmental sensor lineup.
We provide Indoor air quality monitoring solution "AiryQonnect". (Click here for details)
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