This simple, efficient, and inexpensive smart parking application uses an ultrasonic distance sensor, an Arduino, and Google Cloud Platform to provide real-time detection of spot availability. For a full description of the hardware and software system, see the presentation attached in summary.pdf. Two weeks of recorded data is available in data.csv.

This GCP Serverless Function is the main endpoint called by the Arduino every minute. With a simple GET request, the Arduino sends the API two parameters: spot_id and dist, the parking spot identifier and the recorded distance (via ultrasonic sensor) to the nearest object. This information is written to a PostgreSQL database (record and view tables). A sample deploy script is included.

This very simple GCP Function reads the most recent parking data from the PostgreSQL database, implements an is_available function, and serves simple HTML text depending on the determined availability. A sample deploy script is included.

This is the code run by the Arduino continually. From a high level, it initializes an ethernet connection (via the Ethernet Shield 2), then calculates a distance by controlling the sensor, then uploads the data to the parked endpoint described above, then repeats every minute.