If you are interested about parking radars, or any short range distance or object sensing, this is the right project for you. The author uses the SRF04 sonic module for ultrasound generation and reception, the controller used is ATmega128, but probably a smaller one would also do the job. The device is nothing less nothing more then a radar system, measures the time between the sent sound wave and the reflection, then calculates the distance.
Is is easy to extend this project to a parking radar for your car, not to mention the great potential it has in robotics. The schematics, source code is available for download.
Sonic distance measurement: [Link]
The dsPIC30F4012-based Doppler Radar System enables you to track speeding motorists in your neighborhood. The well-designed system generates a microwave energy burst with a 10-GHz transceiver. The microwave signal bounces off of a moving vehicle and the frequency (Doppler) shift is measured to determine its speed.
I must say this is the first DIY Radar system I’ve seen well documented. It’s definitely worth a try if you’re into this kind of projects.
Doppler Radar System Tracks Speeding Vehicles: [Download Project] – [View Project PDF]
Improving upon typical ultrasonic systems, which are ineffective when used around sound-absorbing materials like padded furniture, the Infrared Radar uses infrared light to create a radar rangefinder. Additionally, this radar works faster than ultrasonic radars and improves object identification by measuring the range as well as reflectivity of the target. The speed and single-cycle execution of the ATmega8 microcontroller eliminate the need for external components.