CN203503140U

CN203503140U - Receiving terminal circuit adopted in temperature control system

Info

Publication number: CN203503140U
Application number: CN201320574921.XU
Authority: CN
Inventors: 卜凤悦
Original assignee: TIANJIN CHANGYUE ELECTRONIC SCIENCE AND TECHNOLOGY Co Ltd
Current assignee: TIANJIN CHANGYUE ELECTRONIC SCIENCE AND TECHNOLOGY Co Ltd
Priority date: 2013-09-13
Filing date: 2013-09-13
Publication date: 2014-03-26
Anticipated expiration: 2023-09-13

Abstract

The utility model discloses a receiving terminal circuit adopted in a temperature control system. The receiving terminal circuit comprises a 433 MHZ receiving tuning circuit, a 433 MHZ demodulation circuit, a CPU (Central Processing Unit) control circuit and a digital display circuit, wherein the 433 MHZ receiving tuning circuit receives a 433 MHZ digital signal and transmits the 433 MHZ digital signal to the 433 MHZ demodulation circuit, the 433 MHZ demodulation circuit demodulates the digital signal and transmits the digital signal to the CPU control circuit, the CPU control circuit outputs a temperature numerical value code to the data input end of the digital display circuit, and the digital display circuit displays a temperature numerical value. The receiving terminal circuit has the advantages of improving the temperature detection precision, saving the manpower and cost and meeting a variety of requirements in practical application.

Description

Receiving terminal circuit for temperature control system

Technical field

The utility model relates to thermometer, particularly a kind of receiving terminal circuit for temperature control system.

Background technology

Development along with national economic development, grain storing granary, civilian green house of vegetables, civilian cultivation base etc. are in the urgent need to realizing these local automatic managements, realize automatic management and just must carry out multiple spot monitoring constantly automatically to temperature, current a lot of places are because the reason of technology and cost is difficult to accomplish.The civilian booth that comprises, although cultivation base is also used multiple spot to detect, but be all to utilize manually a plurality of points to carry out one by one single-point monitoring, the single record that carries out one by one, cannot accomplish so constantly a plurality of monitoring points to be monitored simultaneously, and what adopt is alcohol formula thermometer, the variation of environment temperature is had to certain time delay, lost labor not only, time-consuming, effort, and effect is also bad, because having people to enter concrete scene, needs go to observe and record, one-in-and-one-out can make a big impact to whole ecologic environment like this, be unfavorable for the growth of plant, and such management also cannot realize whole automatic control, the scientific management of a high yield also cannot be realized.

Current existing automatic temperature monitoring system is because the cost of receiving terminal circuit is too high, and use is complicated, and peasant cannot accept and operate; In addition, although adopt at present multipoint temperature monitoring for national grain storage, but mostly adopt wired monitoring, watch-dog is complicated, once the damaged monitoring of circuit is just malfunctioning, and owing to adopting, wired long-time circuit that can cause damaged later, so not only increases cost and also can cause line short and initiation fire.

Utility model content

The utility model provides a kind of receiving terminal circuit for temperature control system, and the utility model has improved temperature controlled accuracy, has reduced and has become to produce cost, described below:

A kind of receiving terminal circuit for temperature control system, described receiving terminal circuit comprises: 433MHZ receives tuned circuit, 433MHZ demodulator circuit, cpu control circuit and digital display circuit, described 433MHZ receives tuned circuit and receives 433MHZ digital signal, and transfer to described 433MHZ demodulator circuit, described 433MHZ demodulator circuit demodulates described digital signal and transfers to described cpu control circuit, the numeric coding of described cpu control circuit output temperature is to the data input pin of described digital display circuit, by described digital display circuit displays temperature numerical value.

Described 433MHZ receives tuned circuit and comprises: the 3rd inductance, digital signal after described the 3rd inductance accepts filter, described the 3rd inductance is connected with the 14 electric capacity with the 12 electric capacity respectively, described the 14 electric capacity connects respectively the 4th inductance and described 433MHZ demodulator circuit, transmits described 433MHZ digital signal to described 433MHZ demodulator circuit.

Described 433MHZ demodulator circuit comprises: demodulation chip, and the power supply input pin of described demodulation chip connects second source filter capacitor, the 3rd power filtering capacitor, the 5th inductance and 3.3V power supply; The earth terminal ground connection of described demodulation chip, the 3rd pin of described demodulation chip connects described 433MHZ digital signal, the enable pin of described demodulation chip is connected with the Enable Pin of described cpu control circuit, demodulation carrier frequency first vibration source of described demodulation chip and demodulation carrier frequency the second vibration source pin connect the second crystal oscillator, and demodulation digital signal out exports the digital signal input end of described cpu control circuit to through demodulated digital signal output terminal.

Described cpu control circuit comprises: second singlechip, the power supply termination 3.3V power supply of described second singlechip, the latch signal end of digital display circuit described in the latch signal termination of described second singlechip, the 3rd pin output temperature numeric coding of described second singlechip is to the data input pin of described digital display circuit; The clock signal terminal of digital display circuit described in the clock termination of described second singlechip, the digital signal input end of described second singlechip connects the digital signal after the demodulation of described 433MHZ demodulator circuit output, and the Enable Pin of described second singlechip is controlled the Enable Pin of described 433MHZ demodulator circuit.

The beneficial effect of the technical scheme that the utility model provides is: this receiving terminal circuit receives tuned circuit, 433MHZ demodulator circuit, cpu control circuit and digital display circuit etc. by 433MHZ and realized the accurate collection to temperature, and by digital display tube, the temperature detecting is carried out to real-time demonstration.When user finds that the temperature detect is not in standard operation scope, the temperature in the place such as silo regulates timely, avoid occurring the situation such as too high or too low for temperature, this receiving terminal circuit has improved temperature detecting precision, save manpower and cost, met the multiple needs in practical application.

Accompanying drawing explanation

Fig. 1 is the structural representation of receiving terminal circuit;

Fig. 2 is the structural representation that 433MHZ receives tuned circuit;

Fig. 3 is the structural representation of 433MHZ demodulator circuit;

Fig. 4 is the structural representation of cpu control circuit;

Fig. 5 is the structural representation of digital display circuit;

Fig. 6 a is the digital schematic diagram showing;

Fig. 6 b is digital another schematic diagram showing.

In accompanying drawing, being listed as follows of each parts:

21:433MHZ receives tuned circuit; 22:433MHZ demodulator circuit;

23: the second cpu control circuits; 24: digital display circuit;

ANTI: antenna; L3: the 3rd inductance;

C13: the 12 electric capacity; C14: the 14 electric capacity;

L4: the 4th inductance; U2: demodulation chip;

C15: second source filter capacitor; C16: the 3rd power filtering capacitor;

MAX7219: digital chip.

Embodiment

For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing, the utility model embodiment is described in further detail.

In order to improve temperature controlled accuracy, be lowered into product cost, the utility model embodiment provides a kind of receiving terminal circuit for temperature control system, described below: temperature control system comprises: transmitting terminal circuit, transmitting terminal circuit in receiving terminal circuit, the present embodiment adopts the known circuits in this area, the present embodiment does not limit this and improves, and the present embodiment only improves receiving terminal circuit.

Wherein, referring to Fig. 1, receiving terminal circuit 2 comprises: 433MHZ receives tuned circuit 21,433MHZ demodulator circuit 22, cpu control circuit 23 and digital display circuit 24,433MHZ receives tuned circuit 21 and receives 433MHZ digital signal, and transfer to 433MHZ demodulator circuit 22,433MHZ demodulator circuit 22 demodulates digital signal and transfers to cpu control circuit 23, cpu control circuit 23 output temperature numeric codings are to the data input pin DIN of digital display circuit 24, by digital display circuit 24 displays temperature numerical value.

Referring to Fig. 2,433MHZ receives tuned circuit 21 and comprises: the 3rd inductance L 3, digital signal after the 3rd inductance L 3 accepts filter, the 3rd inductance L 3 is connected with the 14 capacitor C 14 with the 12 capacitor C 13 respectively, the 14 capacitor C 14 connects respectively the 4th inductance L 4 and 433MHZ demodulator circuit 22, and transmission 433MHZ digital signal is to 433MHZ demodulator circuit 22.

Referring to Fig. 3,433MHZ demodulator circuit 22 comprises: demodulation chip U2, and the power supply input pin VDD of demodulation chip U2 connects second source filter capacitor C15, the 3rd power filtering capacitor C16, the 5th inductance L 5 and 3.3V power supply, the earth terminal ground connection of demodulation chip U2, the 3rd pin (aerial signal input end) of demodulation chip U2 connects 433MHZ digital signal, the 8th pin (enable pin) of demodulation chip U2 is connected with the 6th pin (Enable Pin GP1) of the second cpu control circuit 23, by the second cpu control circuit 23, controlled, the RO1 pin of demodulation chip U2 (demodulation carrier frequency the first vibration source) and RO2(demodulation carrier frequency the second vibration source) pin meets the second crystal oscillator X2, for demodulation chip, U2 provides oscillation source, demodulation digital signal out exports the digital signal input end GP2 of the second cpu control circuit 23 to through the tenth pin (demodulated digital signal output terminal DO).

Wherein, the SQ pin of demodulation chip U2, the 12 pin CTH and the 13 pin CAGC connect peripheral circuit, all the other pins: the 7th pin, the 14 pin and the 15 pin are unsettled.

Referring to Fig. 4, cpu control circuit 23 comprises: second singlechip U1, the first pin of second singlechip U1 (power end Vcc) meets 3.3V power supply VCC, the second pin of second singlechip U1 (latch signal end GP5/OSC1) meets the latch signal end LOAD of digital display circuit 24, and the 3rd pin output temperature numeric coding of second singlechip U1 is to the data input pin DIN of digital display circuit 24; The 4th pin (GP3 or CLK) of second singlechip U1 meets the clock signal terminal CLK of digital display circuit 24, the 5th pin (digital signal input end GP2) of second singlechip U1 connects the digital signal after the demodulation of 433MHZ demodulator circuit 22 output, and the 6th pin (Enable Pin GP1) of second singlechip U1 is controlled the Enable Pin of 433MHZ demodulator circuit 22; The 7th pin (GPO) of second singlechip U1 is unsettled, the 8th pin (Vss) ground connection of second singlechip U1.

Referring to Fig. 5, Fig. 6 a and Fig. 6 b, digital display circuit 24 comprises: digital chip MAX7219, the power supply termination 5V power supply VCC of digital chip MAX7219, SEG A～SEG G and SEG DP pin are LED7 section drive wire and decimal dotted line, supply with Display Driver electric current; SET pin outer meeting resistance is adjusted LED display brightness; DIN(data input pin), CLK(input end of clock), LOAD(latch signal) pin, form and to be connected with 3 line serials of cpu control circuit 23, the data of reception and command format are 16 bit data bags.

Wherein, the present embodiment does not limit the model of components and parts, in addition to special instructions, all can adopt the device that can complete above-mentioned functions all can.

In sum, by the receiving terminal circuit in this temperature control system, and coordinate existing transmitting terminal circuit to realize the accurate monitoring to place temperature such as silos, avoid the generation of situations such as occurring overdrying or excessively wet, save time and manpower, improved work efficiency.

It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, above-mentioned the utility model embodiment sequence number, just to describing, does not represent the quality of embodiment.

The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.

Claims

1. the receiving terminal circuit for temperature control system, it is characterized in that, described receiving terminal circuit comprises: 433MHZ receives tuned circuit, 433MHZ demodulator circuit, cpu control circuit and digital display circuit, described 433MHZ receives tuned circuit and receives 433MHZ digital signal, and transfer to described 433MHZ demodulator circuit, described 433MHZ demodulator circuit demodulates described digital signal and transfers to described cpu control circuit, the numeric coding of described cpu control circuit output temperature is to the data input pin of described digital display circuit, by described digital display circuit displays temperature numerical value.

2. a kind of receiving terminal circuit for temperature control system according to claim 1, it is characterized in that, described 433MHZ receives tuned circuit and comprises: the 3rd inductance, digital signal after described the 3rd inductance accepts filter, described the 3rd inductance is connected with the 14 electric capacity with the 12 electric capacity respectively, described the 14 electric capacity connects respectively the 4th inductance and described 433MHZ demodulator circuit, transmits described 433MHZ digital signal to described 433MHZ demodulator circuit.

3. a kind of receiving terminal circuit for temperature control system according to claim 1, it is characterized in that, described 433MHZ demodulator circuit comprises: demodulation chip, and the power supply input pin of described demodulation chip connects second source filter capacitor, the 3rd power filtering capacitor, the 5th inductance and 3.3V power supply; The earth terminal ground connection of described demodulation chip, the 3rd pin of described demodulation chip connects described 433MHZ digital signal, the enable pin of described demodulation chip is connected with the Enable Pin of described cpu control circuit, demodulation carrier frequency first vibration source of described demodulation chip and demodulation carrier frequency the second vibration source pin connect the second crystal oscillator, and demodulation digital signal out exports the digital signal input end of described cpu control circuit to through demodulated digital signal output terminal.

4. a kind of receiving terminal circuit for temperature control system according to claim 1, it is characterized in that, described cpu control circuit comprises: second singlechip, the power supply termination 3.3V power supply of described second singlechip, the latch signal end of digital display circuit described in the latch signal termination of described second singlechip, the 3rd pin output temperature numeric coding of described second singlechip is to the data input pin of described digital display circuit; The clock signal terminal of digital display circuit described in the clock termination of described second singlechip, the digital signal input end of described second singlechip connects the digital signal after the demodulation of described 433MHZ demodulator circuit output, and the Enable Pin of described second singlechip is controlled the Enable Pin of described 433MHZ demodulator circuit.