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Wet soil tester with LED

2014-11-29 08:07  
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This is a very simple circuit that can be used to test whether a pot is dry or not. When the two probes are inserted in wet soil, then the resistance between the sensors are low. The base of T1 will therefore be more negative and the LED is not lit. However, when the soil is dry, its resistance will be high and will base more positive. visit page.Wet soil tester with LED - schematic
Then the LED Ured with the two probes at a damp cloth held. P1 is then adjusted so that the LED just goes out.P1 = 4.7 kOhmD1 = LEDT1 = 547 BC visit page.