The AHT20 and BMP280 are temperature and humidity sensors commonly used with Arduino and other microcontroller projects. These sensors allow you to measure environmental conditions accurately. AHT20 Temperature and Humidity Sensor: The AHT20 is a digital sensor that combines temperature and humidity measurement capabilities in a single module. Temperature Measurement: Measurement Range: -40°C to 85°C Accuracy: ±0.3°C Humidity Measurement: Measurement Range: 0% to 100% RH (Relative Humidity) Accuracy: ±2% RH Communication Protocol: Typically communicates via I2C (Inter-Integrated Circuit) protocol. Usage: Suitable for various applications where temperature and humidity monitoring is essential. BMP280 Temperature and Pressure Sensor: The BMP280 is a digital sensor that measures both temperature and atmospheric pressure. Temperature Measurement: Measurement Range: -40°C to 85°C Accuracy: ±1.0°C Pressure Measurement: Measurement Range: 300 hPa to 1100 hPa Accuracy: ±1 hPa Communication Protocol: Typically communicates via I2C or SPI (Serial Peripheral Interface) protocols. Usage: Commonly used in weather stations, altimeters, and various applications requiring pressure and temperature data.