Introduction: Automatic Plant Watering Alarm
Moisture level is sensed by probes which are embedded in the soil. Be careful while inserting the probes they should inserted into a suitable depth and probes should be separated from each other. When there is no moisture in soil then Collector of Q1 becomes high and this signal goes to the base of Q2 and collector of Q2 become low and we are using this signal to turn on the buzzer.
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