Designing a car parking helper system in a garage using STM32

In parking a car in a garage someone often has difficulty measuring the distance needed. For patrons, forward parking is a bit hard to apply because it is not convenient to look at your forward area of the car through the garage wall. Car parking will be much easier if someone helps to provide information about the distance needed. In this study we designed a system to help provide the necessary distance information automatically without the need for someone's help. The system was built using the STM32 microcontroller and the HC-SR04 ultrasonic sensor to measure the distance needed. The system will give a signal whether the distance is safe or not through the indicator from the LED and the sound. The results of the system design were tested using three different types of barriers with different distances. There is a deviation around 1 cm from the sensor calculation compares to its real distance.