Optimizing the working environment

All over the world, there is currently a growing interest in ventilation due to the coronavirus. This has led to the adoption of CO2 sensors as ventilation indicators across a wide range of industries. Even after the corona convergence, ventilation will become common sense. It is also expected to be used in new fields. For example, in the agricultural field, measuring the CO2 concentration can be used to visualize the rate of photosynthesis and optimize crop management. increase. Wouldn't it be nice to have some kind of feedback instead of just being able to see it?

What we introduce this time is an IoT solution using Infineon's MCU + sensor.

Motion video

Operation overview

Measurement by temperature, CO2 sensor and LINE message transmission through IoT

<Operation ① >
Room temperature and CO2 are detected and displayed on the 7SEGLED. Therefore, when the CO2 concentration is 0-500ppm, the LED lights blue, and when it is 501-1000ppm, the LED lights yellow.​

<Action ②>

If the CO2 concentration in the room is as high as 1001ppm, the LED will turn red. Also, at that time, the MCU will connect to Wi-Fi and connect to an APP called IFTTT. Therefore, IFTTT will send a message to your LINE to encourage you to ventilate your room.

*It is said that if the CO2 concentration exceeds 1000ppm, symptoms such as fatigue, headache, and dizziness will appear. Therefore, the threshold is set at 1000ppm.

Enclosure outline

• <First stage PSoC®62S2CY8CKIT-062S2-43012>

Become an MCU. Infineon's PSoC® 6 controls each sensor and module.

Wi-Fi connection by IoT solution is performed by CY8CKIT-062S2-43012 equipped with CYW43012.

• <Second stage 5VLDO, USB socket for patrol lamp>

Infineon's regulator TLS850B0TBV50 realizes the 5V required for the USB socket for the patrol lamp and the 3-color LED.

• <3rd row each sensor + display LED>

A 7-segment LED is installed to display the temperature, CO2 sensor and the measured value. In addition, a three-color LED that emits a corresponding color depending on the CO2 concentration is also installed.

Used parts

1: CO2 sensor PASCO2 made by Infineon

2: Infineon temperature sensor DPS368 temperature and atmospheric pressure can be measured

*Only the temperature is measured this time.

3: Infineon MCU (PSoC® 6)

4: Infineon Wi-Fi (CYW43012)

5: Infineon LDO TLS850B0TBV50

6:7SEGLED COM-11442

7: RGB LED OSTAMA5B31A

● CO2 sensor features:

ー Extremely small size (14X13.8X7.5mm3) / Save space in your end product
ー ppm level (± 30 ppm, ± of measured value 3%) precision and robust performance
– Advanced correction and self-calibration algorithms
- Various configuration options (sampling rate, baseline calibration, etc.) and interfaces (UARTs, I2C, PWM)
ー High-quality data and compliance with smart building standards Sensor-only compliance with smart building standards
- Plug-and-play for rapid design-to-market

Block diagram (signal line)

① CY8CKIT-062S2-43012: The main microcomputer controls the entire system

+ Receive signal from each sensor

+ Algorithmic calculation

+ Control LEDs

+ Information transfer to cloud through WiFi module

② CO2 sensor: measures CO2 concentration data every 5 seconds

③ Temperature sensor: constantly measures temperature data

④ 7-segment LED: Displays received CO2 and temperature data

⑤ 3-color LED: Lights in corresponding colors depending on the measured CO2 concentration

Block diagram (power line)

(1), (2) Receive 12V from the AC adapter and drop the voltage to 5V

FW development

● Development of CY8CKIT-062S2-43012FW

Development environmentModusToolbox

*If you have any questions regarding details, please contact Macnica Infineon team.

Functions list

Content of control

① Perform timer interrupt processing and acquire CO2 value at 5 second intervals

② Control CO2 sensor, temperature sensor and 7-segment LED with​ ​I2C communication

③ Control RGB LED with GPIO signal by CO2 level

+ <500 ppm: blue

+ 500 ppm - 1000 ppm: Yellow

+ >1000 ppm: red

⑤ Scanning of AP by WIFI module CYW43012, Wi-Fi connection by tethering

⑥ HTTP communication with cloud service IFTTT (when CO2 concentration exceeds 1000ppm)

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Product details