Plant-water monitor

Posted on Apr 23, 2012

When the soil is moist, the LED glows. If the moisture falls below a certain predetermined level, the LED begins to flash. If there is still less moisture, the LED turns off. To calibrate, connect the battery and insert the probe into a container of dry soil. Set R1 to its maximum value then reduce that resistance until the LED begins to flash.

Plant-water monitor
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The range over which the LED flashes before going out is adjusted using R2.

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