Multi-gear soil humidity measuring circuit

Abstract

The invention discloses a multi-level soil humidity measurement circuit. The first humidity measurement electrode sheet A and the second humidity measurement electrode sheet B are inserted into the soil in parallel. When the soil is too dry, the transistor T1 and the diodes D1, D3, D5 , D7 are all in cut-off state, LEDs D2, D4, D6, and D8 are all non-luminous, and need to be watered after sowing to ensure a high germination rate of seeds; when the soil has a certain humidity, the moisture in the soil makes the first humidity measurement The resistance between the electrode sheet A and the second humidity measuring electrode sheet B becomes smaller, the transistor T1 is turned on, and the light-emitting diodes D2, D4, D6, and D8 are sequentially lit. When the humidity of the soil is greater, the transistor T1 The stronger the conduction ability, the more the number of light-emitting diodes, and the colors are red, green, yellow, and blue in turn. The invention adopts the light-up of the light-emitting diode to indicate the relative humidity of the soil, and has good application prospect.

Description

Technical field [0001] The invention relates to a multi-stage soil moisture measurement circuit, which belongs to the technical field of electronic circuits. Background technique [0002] In busy seasons, farmers need to plant seeds according to the soil moisture conditions. When the soil is dry, in order to ensure the normal growth of seeds, they usually water after sowing; when the soil is too wet, they need to wait. After the soil has dried a little bit, sowing is carried out. At present, farmers still use experience to judge the soil moisture, and the accuracy of the judgment is limited, resulting in a low seed germination rate, which affects the seeding effect. Summary of the invention [0003] The purpose of the present invention is to overcome the problem that farmers use experience to judge soil moisture in the prior art, which has limited accuracy and affects the sowing effect. The multi-stage soil moisture measurement circuit of the present invention uses light-emittin...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the problems in the prior art that farmers judge soil moisture through experience, the accuracy is limited, and the effect of seeding is affected.

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