There are no many ultrasonic sensors that use 3.3 V power supply, like this one. It works well with Raspberry Pi and gives accurate measurements. It would be even better if it could measure distances smaller than 20 cm, but at least it reports less than 20 as 20.
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Sylvain
Reliable ultrasonic sensor with convenient I2C interface
A reliable sensor working from 3V and up to 5V. The I2C interface makes it a good choice for applications in which several sensors might be connected to a single MCU. Also a good choice for battery operated devices.
