Blimey, what a tangle. My latest project for a Herbie gadget is much less complicated than it looks. This is just a first prototype. That little black chip has 18 things connected to it, hence the tangle, but all it really amounts to is four switches to turn on the four green LEDs when those five loose dangly wires pass a small current. The danglies are all submerged in water. The dangly on the right connects to the plus side of a little pack of four AA batteries. The others pick up the current through the water and as they do, the switch lights up the lights. Dipping the wires in a jug of water it appears to work.
If I ever get it finished it might look more like this
Its a water tank gauge. The wires will be cut to lengths so as to contact when the tank is 1/4 full, 1/2 full and so on and the little lights will come on accordingly. Its really an electronic dip stick.
The hard bit comes in trying to get a neat circuit layout on a bit of copper strip board. I’m thinking of attaching the danglies to a bit of thin plastic pipe to keep them straight, it only needs to be about half an inch diameter. Then I have to decide whether just to drop it in via the filler cap, or permanently fix it through a hole drilled in the top of the tank. The latter would be better as I wouldn’t then have to withdraw it all when we are filling the tank.
I imagine it will end up costing about £2.50 for the bits. Add labour costs at the minimum wage and the end cost will be about £500!! I am a slow worker.
Still, it keeps me off the streets