Ultrasonic Reverse Parking Aid with Arduino Uno

摘要

In this project, the ultrasonic sensor module type KY-050 is used together with an Arduino and a type KY-012 active buzzer to help while reverse parking our vehicle. As the distance to the objects gets smaller, the buzzer sounds faster to warn the driver that the objects at the rear of the vehicle are nearer. The aim of this little project is to show how the ultrasonic sensor module can be used in a project to measure distance. The KY-050 is a 4-pin module shown in Figure 1. This module uses the HC-SR04 type ultrasonic transmitter/receiver hardware, and it has the following features: 1. Operating voltage: 5 Ⅴ 2. Operating current: 2 mA 3. Detection distance: 2-450 cm 4. Input trigger signal: 10 μs TTL 5. Sensor angle: ＜15 degrees The KY-050 has the following pin names and descriptions: Vcc: Power input; Trig: Trigger input; Echo: Echo output; Gnd: Power ground. The sequential operation of the KY-050 ultrasonic sensor module is as follows (refer to Figure 2): 1. a 10-μs trigger pulse is sent to the module; 2. the module then sends eight 40-kHz square wave signals to the target and sets the Echo pin High; 3. the program starts a timer; 4. the signal hits the target and echoes back to the module; 5. when the signal is returned to the module the echo pin goes Low; 6. the timer is stopped; 7. the duration of the echo signal is calculated and the result s proportional to the distance to the target.