Differences

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--- interfaces:mh-sensor [2016/01/21 15:14] – [Schematic] darron
+++ interfaces:mh-sensor [2016/04/22 12:07] (current) – [Moisture detector] darron
@@ Line 9: / Line 9: @@
 and a pot to give both an analogue and digital (threshold) output.
-Various sensor configurations can be found which include an LDR, NTC thermistor, and
+Various sensor configurations can be found which include an LDR, NTC thermistor,
-two resistive water/moisture detectors.
+two resistive water/moisture detectors and more besides.
 The water/moisture detectors utilise a 2 pin header which can allow us to reuse the
@@ Line 20: / Line 20: @@
 ===Schematic===
-This is a reversed schematic, the capacitor values are unknown.
+This is a reversed engineered schematic, the capacitor values are unknown.
 {{:interfaces:mh-sensor.png?200}}
+===Moisture detector===
+After 3 months of use all I can say is this probe is mostly unusable, the
+resistance value appears to be make little sense until at least you notice that
+the probe is corroding. I have placed a second probe in the soil but this time
+I have insulated the probe header (the other rusted) and now have the probe
+against the inside edge of the pot rather than anywhere near the middle, maybe it will last longer...
+Conclusion. The moisture probes are a waste of time.