ESP32 Starter Kit
4. Test Result
After connecting the wiring and uploading code, LCD display will directly discover the ambient humidity and temper-
ature value.
9.2.28 Project 25: Ultrasonic Rangefinder
1. Description
This ultrasonic rangefinder measures distance of obstacles by emitting sound waves and then receiving the echo. That
is to say, the distance is not an immediate value, but an observed one by a theoretical calculation of time difference
between emitter and receiver.
Ultrasonic is able to detect the shape of objects, set up automatic doors and estimate flow velocity and pressure.
What’s more, it supports cooperative works with computers. As a result, the measured value can be transmitted to
computers via Arduino board.
In daily life, it is widely used for motors, servos and LEDs as well as systems(automatic navigation, control and security
monitoring systems).
9.2. Scratch Project 305
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