Sensor devices for a smart parking system
To build a smart parking system, we should know about some sensors related to a smart parking system. In this section, we will review the main sensors that are used in one.
Let's explore!
Ultrasonic sensor - HC-SR04
The HC-SR04 is a cheap ultrasonic sensor. It is used to measure the range between itself and an object. Each HC-SR04 module includes an ultrasonic transmitter, a receiver, and a control circuit. You can see that the HC-SR04 has four pins: GND, VCC, Triger, and Echo. You can buy HC-SR04 from SparkFun, at https://www.sparkfun.com/products/13959, as shown in the next image. You can also find this sensor at SeeedStudio: https://www.seeedstudio.com/Ultra-Sonic-range-measurement-module-p-626.html. To save money, you can buy the HC-SR04 sensor from Aliexpress.
The HR-SR04 has four pins. There are VCC, GND, Echo, and Trigger. We can use it with Arduino, Raspberry Pi, or other IoT boards.
For demonstration, we can develop a simple application to access...
