Seedling raising shed humidity and temperature monitor circuit

Published:2011/11/23 2:23:00 Author:May | Keyword: Seedling raising shed, humidity and temperature monitor | From:SeekIC

When growing seeding in seeding raising shed, the main thing is to grasp thehumidity and temperature of hot bed soil. Seeding raising shed humidity, temperature monitor introduced in this example can send out voice, light alarm signal when the soil in hot bed is too dry or too wet or the temperature in shed is too high, too low. It can remind the farmer to treat this situation in time. This seedling raising shed humidity, temperature monitor circuit consists of soil humidity monitor circuit, temperature monitor circuit and voice alarm circuit. The circuit is shown in the diagram. Theselection of components and parts R1~R6 adopts 1/4W metal film resistor or carbon film resistor RT1 and RT2 all adopt negative temperature factor thermal resistor (the resistance in normal temperature is about 3kΩ) RP1~RP4 all adopt organic solid potentiometer C adopts ceramic dielectric capacitor or glass glaze condenser VL1~VIA all adopt φ3mm high brightness LEDs; VL1 and VL3are green, VL2 and VIAare red V1 adopts S9012 or 3CG21 type silicon PNP transistors; V2 adopts S9011 or 3DG6 type NPN transistor; V3 adopts S8550 or 3CG8550 type silicon PNP transistor IC adopts CD4069 or CC4069, MC14069 type six not gate IC BL adopts 0.25W, 812 dynamic loudspeaker GB uses low capacity non-maintaining storage battery or four AA battery S adopts small type single-pole tumble switch The two poles of temperature detection probe make up to adopt graphite carbon piece in D size dry battery (using insulating board to set, the distance between two poles is 4cm, wire lead weld on the copper cap of graphite carbon piece).



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