A few days later after ordering a few things off of eBay, there’s now more to come. I did a little experimenting on the fountains yesterday and, well, I broke things.
One of the things I’m changing with the fountains is the power supply. I’m upping it to a 9v power supply. To make it easier to move around the project or to swap the power supply again, I’m using these 9v clip connectors. I started taking apart the fountains to set up my experiment. I will move the current-limiting resistors for the fountain LEDs from the mini-breadboard to a soldered perfboard. I’m also planning on soldering the shift register boards directly to the perfboard since these LEDs will be running off of shift registers the next time you see them. I still need to draw up a plan to confirm the number of pins I need and things like that.
Anyways, on to that experiment! There were a few of things I wanted to test. I had some ideas on new nozzle designs, as well as “piping” designs where the pump would be placed away from the actual nozzle outlet. The last thing was to see if the 9v power supply would play nice with my current setup.
The picture above is of a new nozzle design that takes cues from the experiment I did with the last light show. The opening is slightly larger this time and the flow is pretty decent. The flow gets a little rough as the height is increased or if the water is aimed directly straight up. Those are the limits to using the cheap materials and pumps I’m using. The easy work around is to not aim it directly up, which looks good enough for me.About the “piping” design… I was thinking about trying to isolate the pumps from the turbulent water caused from the water falling pretty much directly onto the water going into the pump, which does cause the pumps to fail at times. I started playing around with the straws I have and I think this is something I’ll be trying out the next time. Of course, the picture above is literally just playing around with water. You’re not going to see random straws sticking up from the pool in the show. 😛This was the aftermath of those piping experiments. I’m pretty satisfied with my short experiments. To sum up, the pumps will be at the back of the pool and the nozzles positioned away from the pumps using the straws. They’ll sport that new nozzle design (though I’m still working on being able to reproduce them consistently). Now about that 9v power supply…It seems as though I’ve burned out three of the 5 transistor circuits. I used 2N4401 transistors because I already had them when I was building the circuit for the fountains. I’ll be moving to mosfets as I’ve always wanted to.
Those mosfets have been ordered on eBay. I also ordered some more of these 5x7cm perfboards, and five more water pumps. I’m not so sure we’ll see all 10 water fountains in the next show (but anything is possible, right?). I mostly ordered them as spares.
So that’s it for now. The project is again on the backburner as I wait for things to come in. Thanks for reading!