Note: This is a bit of a scratch to see what's involved in getting the ping sensor to work as an I2C backpack.
- Jeff Hoeffs [https://github.com/soundanalogous](Sound Analogous) for guidance on using interrupts to do the time measurement on the ATTINY and [https://gist.github.com/soundanalogous/e94c6ebbc457b98b8383](providing a good example to work from)
- [https://github.com/rwaldron](Rick Waldron) for support of the backpack idea and keeping me moving. ;)