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Control circuit diagram (universal board)

Overview

Create a control circuit that analyzes the input signal and controls subsequent relays. It should support external sensors such as raindrops, soil, water, and photoresistors that exhibit resistance changes. The subsequent circuitry can control the switching of electrical equipment based on actual conditions. See the simple experiment video one: directly short-circuiting the input terminal with a piece of wire is equivalent to providing a signal, causing the relay to turn on. In video two, removing the wire disconnects the signal, causing the relay to deactivate. Due to the added capacitor, there is a delay in the relay indicator light turning off, and also a delay in the relay deactivating.

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2026-03-28 15:19:19

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