CN202649157U

CN202649157U - Soil environment testing device

Info

Publication number: CN202649157U
Application number: CN 201220336618
Authority: CN
Inventors: 傅碧辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-07-12
Filing date: 2012-07-12
Publication date: 2013-01-02
Anticipated expiration: 2022-07-12

Abstract

The utility model relates to a soil environment testing device. The soil environment testing device comprises a humidity sensor circuit and a single-chip microcomputer control circuit. Output signals of the humidity sensor circuit are transmitted to the single-chip microcomputer control circuit through a Schmitt trigger circuit and a monostable trigger circuit in sequence, and output signals of the single-chip microcomputer control circuit are controlled and sent to an RS 485 communication interface circuit and an alarm circuit. According to the soil environment testing device, a soil humidity detecting sensor is used to collect signals, after being processed by the single-chip microcomputer control circuit, the signals are sent to a host computer, a current soil moisture state is displayed, and therefore staff are guided to irrigate the soil scientifically, computerized collection and judgment are achieved, and scientific management is achieved.

Description

A kind of soil environment proving installation

Technical field

The utility model relates to a kind of proving installation, particularly be a kind of soil environment proving installation.

Background technology

Because sapling in process of production, need to irregularly be monitored soil, could scientific definition water, avoid because of moisture drying or excessively wet, it is unfavorable that sapling is produced.

The utility model content

The purpose of this utility model is to provide a kind of soil environment proving installation.

The technical scheme that its technical matters that solves the utility model adopts is: a kind of soil environment proving installation, comprise humidity sensor circuit and single chip machine controlling circuit, the output signal of described humidity sensor circuit transfers to single chip machine controlling circuit through Schmitt trigger circuit, single-shot trigger circuit successively, and the output signal control of described single chip machine controlling circuit is sent to RS485 communication interface circuit and warning circuit.

Preferably, described Schmitt trigger circuit is by Sheffer stroke gate D1, the D2 of four Sheffer stroke gate integrated circuit (IC) inside, resistor R1, R2, and capacitor C1, C2 and potentiometer RP1 consist of.

Preferably, described single-shot trigger circuit is by Sheffer stroke gate D3, the D4 of four Sheffer stroke gate integrated circuit (IC) inside, resistor R3, R4, and potentiometer RP2 and capacitor C3 consist of.

Preferably, described RS485 communication interface circuit is connected to the COM end of PC by SN75176 communication interface chip IC1.

By adopting above-mentioned technical scheme, the beneficial effects of the utility model are: the utility model passes through by soil moisture detecting sensor collection signal, after single chip machine controlling circuit is processed, reach host computer, show current soil moisture content state, thereby instruct the pouring of personnel's science, realize computerized collection, judge scientific management.

Description of drawings

Fig. 1 is frame assumption diagram of the present utility model;

Fig. 2 is circuit theory diagrams of the present utility model.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

As shown in Figure 1 and Figure 2, a kind of soil environment proving installation of the present utility model, comprise humidity sensor circuit 1 and single chip machine controlling circuit 2, the output signal of described humidity sensor circuit 1 transfers to single chip machine controlling circuit 2 through Schmitt trigger circuit 11, single-shot trigger circuit 12 successively, and the output signal control of described single chip machine controlling circuit 2 is sent to RS485 communication interface circuit 21 and warning circuit 22.

Described Schmitt trigger circuit 11 is by four Sheffer stroke gate integrated circuit (IC) (Sheffer stroke gate D1, D2 that Sheffer stroke gate D1～D4) is inner, resistor R1, R2, capacitor C1, C2 and potentiometer RP1 consist of, described single-shot trigger circuit 12 is by Sheffer stroke gate D3, the D4 of four Sheffer stroke gate integrated circuit (IC) inside, resistor R3, R4, potentiometer RP2 and capacitor C3 consist of.

When soil moisture was suitable, the resistance value between moisture detection sensor two probes was less, and the input end of Sheffer stroke gate D1 is electronegative potential, and Schmidt trigger can not be triggered.Sheffer stroke gate D4 output this moment high level, make transistor VT1 and VT2 cut-off, this signal is electronegative potential, through resistance R 7 current limlitings, be input to the 21st pin I/O end of single-chip microcomputer IC2, after single-chip microcomputer IC2 internal processor is judged, by the 1st of SN75176 communication interface chip IC1,2,3,4 ends and single-chip microcomputer IC2 the 10th, 11,25 ends connect to form RS485 communication interface circuit 21, send data-signal by single-chip microcomputer IC2 to SN75176 communication interface chip IC1, change backward computer configuration software through SN75176 communication interface chip IC1 and send current data information, computer shows that soil moisture is suitable, thereby instructs the pouring of personnel's science.

When antecedent soil moisture arrives to a certain degree, when the resistance value between humidity sensor two probes rises to a certain predetermined value, the Schmidt trigger that four Sheffer stroke gate integrated circuit (IC) consist of is triggered and is overturn, provide a negative saltus step pulse by capacitor C 2 for monostalbe trigger, monostalbe trigger is turned over, Sheffer stroke gate D4 output low level makes transistor VT3 cut-off, and LED 1 extinguishes; Transistor VT1 and VT2 conducting, this signal is noble potential, through resistance R 7 current limlitings, be input to single-chip microcomputer IC2 the 21st pin I/O end, after single-chip microcomputer IC2 internal processor is judged, send data-signal by single-chip microcomputer IC2 to SN75176 communication interface chip IC1, after SN75176 communication interface chip IC1 conversion, send current data information to the computer configuration software, computer shows that soil moisture is dry, should in time water; Another road output by the 2nd pin output low level of single-chip microcomputer IC2, through resistance R 9 current limlitings, makes information ring device BY send alarm sound, and prompting the field staff in time water, and realizes computerized collection, judges scientific management

Above-described only is a preferred embodiment of the present utility model, can not limit the scope that the utility model is implemented, and every equalization of doing according to the utility model claim changes and decorates, and all should still belong in the scope that the utility model contains.

Claims

1. soil environment proving installation, it is characterized in that: comprise humidity sensor circuit (1) and single chip machine controlling circuit (2), the output signal of described humidity sensor circuit (1) transfers to single chip machine controlling circuit (2) through Schmitt trigger circuit (11), single-shot trigger circuit (12) successively, and the output signal control of described single chip machine controlling circuit (2) is sent to RS485 communication interface circuit (21) and warning circuit (22).

2. soil environment proving installation according to claim 1, it is characterized in that: described Schmitt trigger circuit (11) is by Sheffer stroke gate D1, the D2 of four Sheffer stroke gate integrated circuit (IC) inside, resistor R1, R2, capacitor C1, C2 and potentiometer RP1 consist of.

3. soil environment proving installation according to claim 2 is characterized in that: described single-shot trigger circuit (12) is by Sheffer stroke gate D3, the D4 of four Sheffer stroke gate integrated circuit (IC) inside, resistor R3, R4, and potentiometer RP2 and capacitor C3 consist of.

4. it is characterized in that according to claim 1 or 3 described soil environment proving installations: described RS485 communication interface circuit (21) is connected to the COM end of PC by SN75176 communication interface chip IC1.