Humidity indicator circuit

Published:2011/11/23 2:10:00 Author:May | Keyword: Humidity indicator | From:SeekIC

For the purpose of raising early and better seeding, in the village, people always use plastic film to make up simple raise seed shed in the ground. The disadvantage of this shed is the humidity in the shed is often too large, and it affects the normal growth of seeds. This example describes a simple seedling shed moisture indicator, which uses LED to indicate the size of the humidity of the greenhouse seedlings, and it is easy to use. This humidity indicator circuit consists of moisture detection amplifier and LED indication circuit, and it isshown in the diagram. You can set the desired humidity alert by adjusting the resistance of RP. Component selection: R1 ~ R5 use 1/4W carbon film resistor or metal film resistors; RP is organic, solid potentiometer or variable resistor. RS is made by 3DG6 transistors with the value greater than 100. VL1 and VL2 choose light-emitting diodes φ5mm. V1 and V2 select 3DG6 or S9013 silicon NPN transistor. IC chooses μA741 or 5G24-type IC op amp IC. GB chooses 9V laminated battery. S chooses small single pole toggle switch.



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