HenryD
Recycles dryer sheets
- Joined
- Jun 6, 2013
- Messages
- 355
Very cool!
What is the unit on the vertical axis?
Centimeters. I can dust off the code if you're interested. Just Python running on a RaspberryPi Zero with a wifi dongle and ultrasonic distance sensor. The return time was too fast for the senor at less than 13-14 cm. The signal got a bit messier when I added the clutter of the backup 12v pump.

I had always heard that the name Chicago was the local indian word for "land of stinking waters" due to the swamp nature of a lot of the area back then. When the canal was dug and the Chicago River reversed flow, all the nasty drained southwestward away from the lake. And some areas were raised up. My mom had a relative who lived in part of the city that was raised with the vaults, and they had access to one through their basement(s). I never saw it, the person died before I was around. I could have made a TV show of it, and beat whats-his-name to it! I can picture the guy, but can't remember his name. After all the hype, only old whiskey bottles were found.