Among them, SHT30 is used for temperature and humidity collection, BMP280 is used for atmospheric pressure collection, BH175 is used for light intensity (more difficult to weld), SGP30 is used for carbon dioxide content and air quality, and finished modules are used for soil nutrient content. A 485-turn TTL circuit is designed to detect soil nitrogen, phosphorus, and potassium content. . 
The STM32L431RCT6 side code can be uploaded in the attachment.
| Devices | Class | introduce | Datasheet |
|---|---|---|---|
| SHT30-DIS-B10KS | Temperature and humidity sensor | Download | |
| BMP280 | The sensor;Sensor/transducer | The new Bosch air pressure sensor can measure atmospheric pressure, has high-precision temperature measurement, and can be calibrated to accurately calculate altitude. I2C or SPI interface, wide range (300-1100hpa), high accuracy | Download |
| RT9013-33GB | Power/power management;The power supply circuit | 500mA, Low Dropout, Low Noise Ultra-Fast Without Bypass Capacitor CMOS LDO Regulator, SOT-25 | Download |
| 铜柱m3*45mm | Download | ||
| 3225-20MHZ-15PF-10PPM | Analog mixed-signal IC;SMD crystal resonator (passive) | Equivalent series resistance (ESR): 40Ω Main frequency: 20MHz Frequency tolerance: ±10ppm Load capacitance: 15pF | Download |
| 0603CG100J500NT | Passive components;The patch capacitance | Accuracy: ±5% Capacitance: 10pF Rated voltage: 50V Temperature drift coefficient (dielectric material): C0G Material: C0G | Download |
| 2.54-1*4P母 | Download | ||
| SP485EN | Download | ||
| 82536070 | varistor | Download |
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