In this blog, we will identify the hardware needed to build this project.
The core hardware of this project would be Raspberry Pi 4.
The next hardware that we would look into is the power device. Since this is a portable monitoring system, it should be able to run outside the building. For this, i have chosen the UPS Plus V6 For Raspberry Pi. Not sure if this will be the good option.
Since we would need to attach more than one sensor to this system, it would be better to use an expandable board. The grove base HAT would be the best choice for this.
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Now it's time to decide on the sensors we would use in this project.
#1 Grove - Gas Sensor(O₂)
Grove Oxygen Sensor is a kind of sensor to test the oxygen concentration in the air through the principle of the electrochemical cell. The current oxygen concentration can be known clearly by outputting voltage values proportional to the concentration of oxygen and referring to the oxygen concentration linear characteristic graph. This sensor is very suitable for detecting oxygen concentration in the environment. This Gas Sensor is an organic reaction module, it can provide a little current while putting it in the air, we don't need to provide external power to it, and the output voltage will change as time current changes.
These are the feature of the sensor
#2 Grove VOC and eCO2 Sensor
The Grove-VOC and eCO2 Gas Sensor SGP30 is an air quality sensor. Based on SGP30, this module provides TVOC(Total Volatile Organic Compounds) and CO2eq output with outstanding long-term stability and low power consumption, which makes it a perfect choice for indoor air quality detection. The SGP30 is a digital multi-pixel gas sensor designed for easy integration into air purifiers, demand-controlled ventilation, and IoT applications. Sensirion’s CMOSens®technology offers a complete sensor system on a single chip featuring a digital I2C interface, a temperature-controlled micro hotplate, and two preprocessed indoor air quality signals. As the first metal-oxide gas sensor featuring multiple sensing elements on one chip, the SGP30 provides more detailed information about air quality.
Below is the spec of the sensor
#3 SHT40 Temperature & Humidity Sensor
The SHT40 sensor is the fourth-generation sensor. The SHT40 has an excellent ±1.8% typical relative humidity accuracy from 25 to 75% and ±0.2 °C typical accuracy from 0 to 75 °C. The SHT40 has an excellent ±1.8% typical relative humidity accuracy from 25 to 75% and ±0.2 °C typical accuracy from 0 to 75 °C.
#4 LTR 390 UV Light Sensor
The LTR 390 is an integrated low-voltage I2C ambient light sensor (ALS) and ultraviolet light sensor (ALS) and ultraviolet light sensor (UVS). This sensor ocnverts light intensity to a digital output signal capable of direct I2C interface. It provides a linear LAS response over a wide dynamic range, and is well suited to applications under high ambient brightness.
And of course to connect all this together we would need the Grove and Stemma QT cable.
Grove Cable
Stemma QT Cable
For the moment this are sensors, that i have identified. In the future if there is any addition, i will update it here as well.
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