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Hi everyone. has anyone got this working ? can i get help for the schematics im going to use these valves shin shih 12vDC with 100mA to 350mA
(Shih Shin Technology Co., Ltd. - Pneumatic solenoid valve SH-V0829 - EC Plaza) i think ill use about 25 valves and a z8 microcontroller with an ethernet. ill appreciate all help thanks
I was at the Celine concert at the Colosseum in Vegas last nite and they have a large cylindrical based aquagraphics unit for Celine to stand within while she does the Titanic theme. Interestingly they use a floor grid to allow the water to fall through so no splashing occurs.
From what I can tell it's all gravity fed. Any kind of pressure would require a faster solenoid switching action. Based on the display which had only wavy water patterns and no true graphix, it's possible that a rotating slotted deflector governs the falling patterns. They used light projection on the water curtain to generate the imagery.
On the matter of the solenoid drives , the ULN darlington series is barely adequate to drive the 500mA loads. Some heatsinking and fans will be required to make those work. I figure it's better to use some dual logic nfets like the fairchild FDC 64XX series. Just use a flywheel diode.
should i use IGBT or Darlington pair ? WHY?
I dont see any reverse diodes across your drivers to the solenoids and high switching frequencys of the coils will generate some huge emf that could blow your drivers up, pitty to see all that nice work go up in smoke for the lack of a few diodes.
You could solder the diodes to the bottom of the board across the driver pins.
Wish you good luck with the project and look forward to seeing a utube video of the working result.
Pete.