/challenges-projects/design-challenges/smarter-life/b/blog/posts/moisture-sensor-board-design-psoc4-smarter-life-challengeGot some work done on the sensor boards today. Here is the logic diagram: As you can see the Moisture sensor end of the design is very simple. Just a CMOS 555 timer set up in astable mode. Resistor values of R1 and R2 were chosen experimentally in myen-USTelligent Community 12https://community.element14.com/challenges-projects/design-challenges/smarter-life/b/blog/posts/moisture-sensor-board-design-psoc4-smarter-life-challengeWed, 20 Nov 2013 21:23:39 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:1330ce0c-b84b-4135-807b-88ab747cbfb1COMPACT0<p>Nice board!</p><p>I built one of these in the 70&#39;s. It was aptly named a Water Warbler.</p><p>I used coat hanger wire for the probes and the 555 was configured to vary its &quot;warble&quot; according to the soil moisture content.</p><p>Back then we didn&#39;t have CMOS versions of the 555.</p><p>Nice to see it updated using CMOS and SMT.</p><p><br /><br /></p><img src="https://community.element14.com/aggbug?PostID=16542&AppID=105&AppType=Weblog&ContentType=0" width="1" height="1">https://community.element14.com/challenges-projects/design-challenges/smarter-life/b/blog/posts/moisture-sensor-board-design-psoc4-smarter-life-challengeWed, 20 Nov 2013 20:51:02 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:1330ce0c-b84b-4135-807b-88ab747cbfb1DAB0<p>Nice simple circuit.</p><p>&nbsp;</p><p>I look forward to seeing how well it works with the PSOC.</p><p>&nbsp;</p><p>DAB</p><p><br /> </p><img src="https://community.element14.com/aggbug?PostID=16542&AppID=105&AppType=Weblog&ContentType=0" width="1" height="1">