A pressure sensor is a device for pressure measurement of gases or liquids. … Pressure sensors are used for control and monitoring in thousands of everyday applications. Pressure sensors can also be used to indirectly measure other variables such as fluid/gas flow, speed, water level, and altitude.
The humidity sensing component of the DHT11 is a moisture holding substrate with the electrodes applied to the surface. … The DHT11 converts the resistance measurement to relative humidity on a chip mounted to the back of the unit and transmits the humidity and temperature readings directly to the Raspberry Pi.
The ADS1115 is an external digital analog converter (ADC) that we can connect to a processor like Raspberry Pi to measure analog signals. Raspberry Pi doesn’t have internal ADCs that we use when we use the Raspberry Pi analog inputs.
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