This post WILL contain magic!* As this is my third attempt to write this (previous attempts were thwarted, no doubt by ancient powers, wishing to protect secrets of the arcane from the uninitiated. Or a power outage and strange webpage glitch that deleted all my text when I clicked save as a draft to prevent that very thing!)
On no few (or greater) than 3 occasions this week, I felt the instinctive need for proof!
It is possible that one of those occasions was due to over excitement and/or low expectation. 1 & 1/2 of them however were pure magic!*
Also there will be pictures.
This is the 'rig. It now has 2 shelves. and rope. I looked up knots online, and chose a round turn and 2 half hitches with which to fasten the ropes. I'm sure it will be fine.
If I am wrong and I should use different knots, let me know!
I am still setting up the 'rig' but you get the idea.
This is a light module it will light both the test area and below the 'rig'
See the spool of cable on the right? Note how loose it is?
Let me save you from spool of cable hell by saying DON'T LET YOUR CABLE GET LOOSE. Holy Jumpin'. I am so so oh so lucky that I decided to re-do it to make sure it fit on the spool better. I didn't know until I was part way through (quite early on) what trouble a loose would be. It started to unravel and fall off the sides. At one point I had a loop, that my lead was passing through, and I had to feed the new spool through said loop over and over until I reached the point that the loop came off the spool.
I have no pictures. It didn't occur to me that, pictures of utter failure, could be useful, until I managed to slip out of the jam. :)
Lesson learned. Here is the setup I used to wind the cable onto the spool. The orange wheel is for measuring distance as you walk. I am using it here to measure the length of the wire, but I bought it to use during the test, to see how much line has played out, and judge depth. There is some error to work out.
First the center of the wire is the distance that needs to be measured and it is an 1/8th of an inch from the edge of the wheel. That changes the diameter and circumference. The wheel normally measures 1 foot per turn, but the wire is spread further and each tick on the meter is actually about 12.27".
Second the rope will stretch some. I don't know how much, I will try to find out. :)
I added this adjustment to help keep tension on the wire and keep it from derailing. I hot glued disks to the outside of the wheel to keep the rope/wire/cable on.
Don't worry, magic* is coming.
Okay, so this is the first incident of 'proof need feeling'. I was trying to determine what length of cable I could get a signal across. I tried at the full 305m (1000') but no signal. I soldered quick connects to make testing faster, anticipating many cuts until getting a signal. So I chopped off 10m. Tested. Low and behold a strong signal and what i will call 295m. I did not expect this but perhaps I was just pessimistic.
The pictures above are:
Left: Set up, Middle: OpenROV connection, Right: Raspberry pi Camera connection.
What none of these pictures is showing you, is proof. And that is sad because that is why I took them. lol. The one just above was intended to show all the connected wires. Really was just crazy happy.