I've thought about this for a few years... it started while waiting in front of a drip coffee maker I think... I even bought some brass 12V valves from ebay, but I have never touched them (and there's not much biohacker scene here, I guess)
On Tue, Feb 2, 2016 at 10:36 AM, Mac Cowell <mac@diybio.org> wrote:
> $20 is still probably cheaper than this 3D-printed servo-driven ball
> valve... But the servo could be handy.
> http://www.thingiverse.com/thing:1052421
The $4 solenoid valves are $7 on AdaFruit, with the addition of a helpful voltage vs current table:
-- On Tue, Feb 2, 2016 at 10:36 AM, Mac Cowell <mac@diybio.org> wrote:
> $20 is still probably cheaper than this 3D-printed servo-driven ball
> valve... But the servo could be handy.
> http://www.thingiverse.com/thing:1052421
The $4 solenoid valves are $7 on AdaFruit, with the addition of a helpful voltage vs current table:
| Voltage | Current |
| 6V | 160 mA |
| 7V | 190 mA |
| 8V | 220 mA |
| 9V | 240 mA |
| 10V | 270 mA |
| 11V | 300 mA |
| 12V | 320 mA |
While they're recommending "a TIP120 or N-Channel power FET with a 1N4001 kickback diode to drive this from a microcontroller pin" I note that the voltage and current limit on a ULN2003 is 50V and 500mA... these are common driver chips that come with kits for LEDs and motors on ebay, etc... for driving such loads from a microcontroller/other sensitive source.
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