Our garage has a ladder sticking out near where we park our car. We want to park close to the ladder leaving enough room to walk in front of the car and also allow room behind the car for the garage door to close. A typical solution to this need, and one we’ve used in the past, is to have a tennis ball on a string positioned such that the car window nudges the ball and shakes the string — so you know when to stop. A great analog solution! I, however, desired a digital solution that incorporates a Raspberry Pi.
OK, a digital solution should either have a sensor that is tripped by the car or, even better, something that could dynamically measure and show the distance from the car to the ladder. This would require some way to provide feedback to the driver. Hmmmm, feedback could be visual or maybe via sound. Yes, that’s it! I could have an R-Pi measure the distance and “talk” to the car driver. Another project is born 😎