This electronics project Automatic Plant Watering System can be easily implemented for watering plants without human action. Circuit will automatically detect and pump water whenever needed. By using this automatic irrigation system we can avoid the chance of plants damage. In our busy life we often forget watering plants. So here is the perfect solution for that problem.
Circuit for this electronics project is very simple and working with a simple logic that the resistance of soil is very high when it is dry and vice versa. Insert two probes into the soil; they will conduct if there is water in it. If it is dry they will not contact because of high resistance. A 9V battery is the power source. Hex-inverter buffer 7404 IC is used to sense the status of probes. If the soil is not wet, it will create a voltage drop because of the high resistance. Hex-inverter will detect this and trigger the first 555 timer IC, which is wired as a monostable multivibrator. Output pin 3 of first 555 timer is connected to the input of second timer. Second timer wired as an astable multivibrator will drive the relay through a transistor SK100. Fix this transistor on a heat sink to exchange the heat dissipated. When transistor turns on the relay, it opens the electric valve. The output port of the electric valve is connected using a pipe to the soil to water plants. According to the water level in soil, resistance start decrease and conduction will start between the probes. This will make 7404 IC to stop triggering first timer IC. So there is no output to second timer IC. As a result relay get deactivated and close the electric valve. Variable capacitor (C1) and resistor (R3) are used for adjusting the sensitivity of the automatic plant watering circuit. These types of electronics project are very useful and help everyone to learn electronics.
Automatic Plant Watering System Circuit Diagram
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