#1. The hole in the top of the tank is about 1.6" diameter. The supplier doesn't give the size of the unit. I guess I'd need to buy one on speculation to find out if it would fit through the opening.
#2. In my ignorance, I'm just a little bit concerned about ultrasound bouncing off the side of the steel tank and giving false readings (not that that dumb float on a twisted strip of beer can isn't also giving false readings).
#3. What would I use to measure the time between ultrasonic outgo and input? Can you give me a link?
#4. What would I use to convert that to distance? Can you give me a link?
#5. What would I do to convert the information in #4 to a visual signal? Can you give me a link?
Regarding my cellar stairs, they are even older than I am and it's only a matter of time before they just collapse but, of course, the same can be said for me.
Not sure if it has been mentioned yet but a simple go no go device would be to use a flat float with a wooden dowel mounted vertically a couple of stripes painted on the dowel indicating high and low would do the trick for being able to view the marks without having to go down in the basement could be done with a light and mirrors adjusted so you could see the stick from the top of the stairs. If there is a pathway to the tank by walking there is an optical path which can be directed to be seen use a very small light aimed at the stick and the first mirror will direct a beam to the rest of the mirrors the cost would be next to nothing, and not dependent on any quirky electronics
Never try to tell me it can't be done
When I have to paint I use http://kbs.justoldtrucks.com/
#2 The ultra sonic beams are focused pretty tight. Would not be an issue.
#3,4,&5 You would need some circuitry to generate pulses to the one input and a decoder to read the time spaces on the output. It could possibly be done with a 555 IC and then something on the output to differentiate the waveforms and measure the time between pulse replies. You could also do it with a simple push button switch to pulse the input and then something to measure the time from the switch push to the return pulse in microseconds. It could be done with analog circuits, but from the website "We recommend the NewPing library to use this sensor with your Arduino or compatible." it is intended to be used with a microprocessor and IO interface. Unless you have something like an early RADAR background, you will need to learn some electronics and math to make it work analog. To make it work right you will need to learn to speak to an Arduino.
I was a Nav Comm tech for the FAA for 35 years and retired 10 years ago. I have let the industry pass me by. I think I could build a circuit to work with this ultra sonic device, but I would have to dust off my slide rule
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