CN2301715Y - Electronic thermometer hydroscope - Google Patents

Abstract

The utility model discloses an electronic thermometer hydroscope, which adopts a chip comprising an A/D converter, a microprocessor, a liquid crystal displaying driver, an input mouth and an output mouth. The dedicated program of this product is packed in the mask, using a humiture sensor which is cooperated with a peripheral circuit to make the liquid crystal display show the humiture as well as the time values. The product has the main features of digit displaying, low power consumption, stable and reliable performance and high anti-interference capability, having multifunction of measuring temperature and humidity, indicating time, automatic start after being out of work, warning of upper and lower limit of humiture, setting time and adjusting meter, etc., being applicable to the usage of tobacco, textile, storehouse, library, office and home environment.

Description

The humiture electronic watch

The utility model relates to a kind of electronic test instrument, particularly a kind of temperature, relative humidity and time value measured simultaneously, and with the liquid crystal digital device shown.

Temperature and humidity measurement instrument in the past is to adopt mimic channel, with the A/D transducer that separates, liquid crystal driver and necessary calculating comparator circuit.Hardware configuration is comparatively complicated, and discrete component quantity is many, causes poor reliability.Again because of humidity sensor is to adopt common macromolecule membrane humidity sensor, therefore, the cost height.

Task of the present utility model provides a kind of humiture electronic watch, and it can accurately measure also temperature, the humidity of digital display environment the while, can also show the time and the startup automatically of crashing, the caution of humiture upper and lower limit, timing and mileometer adjustment.

For solving above-mentioned task, adopt special-purpose CPU microprocessor, mask package specific program on it, control moisture temperature RC vibration utilizes Temperature Humidity Sensor, cooperates peripheral circuit, makes the LCD liquid crystal display displays go out humiture and time value.Wherein special chip comprises A/D converter, microprocessor, LCD driver and input, delivery outlet.Temperature sensor adopts thermal resistor; Humidity sensor adopts humidity-sensitive capacitor.Peripheral circuit comprises power driving circuit, two tunnel humiture RC oscillatory circuits, crystal oscillating circuit and buzzer driving circuit.

The utlity model has following advantage:

(1) microprocessor chip of Cai Yonging has comprised the A/D transducer, and LCD driver and microprocessor 80 sections liquid crystal drive ability is arranged, and power consumption are little.The humiture sensitive element is directly realized A/D conversion by specific program that resides in the CPU microprocessor internal and internal circuit, not influenced by the humiture, vibration etc. of external environment, and therefore stable and reliable for performance, antijamming capability is strong.

(2) Temperature Humidity Sensor of selecting for use is MF58 type thermal resistor and MSR-2 type macromolecule humidity-sensitive capacitor, and its cost is low, power consumption is little, response speed is fast, good stability; Because of the yield rate height of mask software encapsulation, therefore improved the quality of product and reduced cost again.

Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail.

Fig. 1 is a basic circuit diagram of the present utility model;

Fig. 2 is the software flow pattern of humiture electronic watch;

Fig. 3 is the structural representation of desk-top humiture electronic watch.

Fig. 1 illustrates the humiture electronic watch and mainly comprises dedicated cpu chip 2; 80 sections LCD 1 and peripheral circuit.CPU adopts conventional MSM64162-001 model chip, contains A/D transducer, LCD driver, input, delivery outlet on it, and mask is packaged with the software of realizing the utility model function.Its XT, XT pin connect the crystal oscillating circuit that time clock is provided for cpu chip 2.IN1, CS1, RS1, RT1 jointing temp RC oscillatory circuit, RT1 connecting resistance formula temperature sensor MF58 type thermal resistor wherein, RT0, CRT0, CS0, RS0, IN0 connect humidity RC oscillatory circuit, and CRT0 connects humidity sensor MSR-2 type macromolecule humidity-sensitive capacitor.C ₂, C ₁, V _SS3, V _SS2, V _SSLMeet the required capacitor C that boosts of chip internal ₁, C ₂, C ₃, C ₄V _DDAnd V _SS1Meet input voltage 1.5V.L ₀～L ₃Meet the common port Com of LCD LCD 1 ₁, Com ₂, Com ₃, Com ₄Line; L ₄～L ₂₃Meet LCD liquid crystal section route selection Seg ₁～Seg ₂₀P ₀, P ₃, P ₂Connect 12 toggle switchs of input port.BD connects buzzer driving circuit 6.

Fig. 2 illustrates second and to interrupt 20, and once mainly finish clocking capability p.s., has again simultaneously once to wait synchronous function to expire carry, per 10 seconds or per minute system thermometric hygrometric of some conversion, life morning and afternoon.

The demonstration time 21, LCD shows one time the current time value 1 p.s..

Temperature sensor 22 adopts thermal resistor commonly used to measure temperature value.Carry out the A/D conversion by temperature RC oscillatory circuit, the current resistance of analog quantity thermal resistor is converted to a sandwich digit amount.

Table look-up, displays temperature 23, by searching, find out corresponding temperature value through the sandwich digit amount that draws of experiment and the truth table of temperature value, through LCD 1 demonstration, finish measurement to temperature.

Humidity sensor 24 adopts the cheap ultrathin membrane humidity-sensitive capacitor of MSR-2 type to survey humidity value.Carry out the A/D conversion through excess temperature RC oscillatory circuit, analog quantity humidity-sensitive capacitor appearance value is converted to a sandwich digit amount.

Formula calculates, demonstration humidity 25, by this sandwich digit amount, and the formula Y that substitution is specific _RH=KC _{(middle electric weight)}+ b tries to achieve the humidity value of current environment.Show through LCD 1, finish measurement humidity.

Fig. 3 shows desk-top humiture electronic watch by comprising that circuit board 30, LCD 1 and shell 31 that special chip 2, peripheral circuit and element thereof are installed form.Adopt 1 joint No. 5 batteries of 1.5V or the power supply of DC1.5V power supply.This product can carry out 0～55 ℃ of temperature survey and demonstration, and when temperature was lower than 19 ℃, the lower left corner of temperature display segment 32 showed " L " symbol in the display screen 1; When temperature was higher than 25 ℃, the upper left corner of display screen temperature display segment 32 showed " H " symbol.Simultaneously can carry out 0～99%RH moisture measurement and demonstration, when humidity was lower than 40%RH, the lower left corner of humidity display section 33 showed " DRY " symbol in the display screen 1, the expression environmental drying; When humidity was higher than 70%RH, the upper left corner of display screen humidity display section 33 showed " WET " symbol, the expression humid environment.When time showing section 34 can show in the display screen 1, branch, the moon, day.And the locking function arranged, when timing arrives, (()) symbols appear in the time showing section 34 of display screen, simultaneously buzzer 5 send interrupted toot cry, sustainable toot cried 1 minute.As toot raise key 36 by numeral when crying, then toot cry termination.

Press the function selecting key 37 of front panel, optional another day, month or the time, the branch show state.Showing that key 35 is selected in step-by-step under the time state, this machine is in regularly adjustment state, key 35 is selected in step-by-step again, " AM " or " PM " flicker appears in time display screen 34, represents that respectively this machine is in the morning or timing in afternoon adjustment state, then raises the 36 adjustable mornings of key or by numeral the time in the afternoon.Key 35 is selected in same step-by-step, and as display screen 34 appearance " MONTH " and " DATE " symbols, raise key 36 adjustable days, month numerical value by numeral this moment.After having regulated again step-by-step select key 35, then this machine enters normal operating condition.Casing 31 back sides also have 1 ℃/function shift key in addition, temperature are shown be in ℃ or state by this key.

The utility model also can be made into wall-hanging, or makes various improvement under the situation that does not depart from design of the present utility model and field, and the utility model is not limited.

Claims (4)

1. a humiture electronic watch is made up of circuit board that comprises A/D transducer, Temperature Humidity Sensor, LCD driver and display, it is characterized in that: A/D transducer, LCD driver are on chip piece (2); This chip contains input, delivery outlet and microprocessor, and mask is packaged with the specific program of realizing this apparatus function; Temperature sensor adopts thermal resistor, and humidity sensor adopts humidity-sensitive capacitor; Peripheral circuit comprises power driving circuit (4), two tunnel humiture RC oscillatory circuits (3), the crystal oscillating circuit and the buzzer driving circuit (6) of time clock is provided for cpu chip.

2. humiture electronic watch according to claim 1 is characterized in that: chip has 80 sections liquid crystal display drive circuits, 12 input ports, and two road A/D transducers can be selected MSM64162-001 type cpu chip for use.

3. humiture electronic watch according to claim 1 is characterized in that: temperature sensor is a MF58 type thermal resistor; Moisture sensor is a MSR-2 type macromolecule humidity-sensitive capacitor.

4. humiture electronic watch according to claim 1 is characterized in that: shell (31) front is provided with function selecting key (37), the position selects key (35) and numerical value to raise key (36); Also be provided with one ℃/function shift key in addition.

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