tag:blogger.com,1999:blog-6238454757421809452.post163936819085304033..comments2024-01-29T06:22:58.174-05:00Comments on The Raspberry Pi <br>Hobbyist: Gotta Know When to Fold 'emTed B Halehttp://www.blogger.com/profile/16887056993667506084noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-6238454757421809452.post-75351346184338619112014-06-13T00:20:37.880-04:002014-06-13T00:20:37.880-04:00Ray has since come out with a version that control...Ray has since come out with a version that controls this valve, <br />http://rayshobby.net/cart/osbeeshield in case you are not done yet.Michael Fairchildhttps://www.blogger.com/profile/16948367706396291685noreply@blogger.comtag:blogger.com,1999:blog-6238454757421809452.post-81983315437503937712013-08-21T14:12:39.883-04:002013-08-21T14:12:39.883-04:00I see you have found the solution. As I said in my...I see you have found the solution. As I said in my post above, typical solenoids are pretty straight-forward to use. I am trying to use a latching solenoid. Hope to find time this week to build the new design. Maybe the third time will be the charm. :)Ted B Halehttps://www.blogger.com/profile/16887056993667506084noreply@blogger.comtag:blogger.com,1999:blog-6238454757421809452.post-74738036196407417962013-08-13T17:33:53.813-04:002013-08-13T17:33:53.813-04:00I have had no luck controlling a water valve solen...I have had no luck controlling a water valve solenoid. See http://dicks-raspberry-pi.blogspot.com/<br />I have a 1/2" valve purchased vrom adafruit. In the same order, I got the NPN transistor and diode they recommend. I searched out diagrams (also shown in my blog).<br />When nothing worked, I deconstructed the circuit, replacing the 9v solenoid with an LED-resistor at 3.3v. I swapped poles on the transistor: dead.<br />Even at 3.3v the transistor gets too hot to touch. Any ideas?Dick Haighthttps://www.blogger.com/profile/12989641941024072869noreply@blogger.com