A Maker by the name of Klaus recently built a “speaking distance sensor” to help him park his car.
“Originally, this parking/distance sensor used a small TFT to display the distance to an object, but after a few revisions, Klaus redesigned the device to speak the current distance, courtesy of an SD card and a soothing female voice,” explained HackADay’s Brian Benchoff.
“Right now, the voice is set up to speak the distance from an object to the sensor from 10 cm to 1 m in 5cm increments. This isn’t the limit of the sensor, though, and the device can be easily reconfigured to sense a distance up to four meters.”
Currently, the board lacks an on-board amplifier/speaker, although adding a small amplifier (courtesy of Adafruit) should be sufficiently loud to be heard inside the noisiest parking lots and out in the street.