CN212059087U

CN212059087U - Electronic scale of low-cost LED display screen

Info

Publication number: CN212059087U
Application number: CN202020317101.2U
Authority: CN
Inventors: 林超
Original assignee: Avia Semiconductor Xiamen Co ltd
Current assignee: Avia Semiconductor Xiamen Co ltd
Priority date: 2020-03-13
Filing date: 2020-03-13
Publication date: 2020-12-01
Anticipated expiration: 2030-03-13

Abstract

The utility model discloses an electronic scale of low-cost LED display screen, including power interface circuit, switch machine key circuit, power voltage stabilizing circuit, weighing sensor, singlechip, keyboard, LED display screen and high accuracy analog-to-digital converter chip, power interface circuit electric connection switch machine key circuit, switch machine key circuit electric connection power voltage stabilizing circuit, power voltage stabilizing circuit electric connection singlechip, singlechip electric connection keyboard LED display screen weighing sensor electric connection high accuracy analog-to-digital converter chip. The utility model discloses a 6 mechanical button of 2 IO mouth drives, reduces the demand of singlechip IO mouth quantity, has reduced the cost of electronic scale.

Description

Electronic scale of low-cost LED display screen

Technical Field

The utility model relates to an electronic scale technical field specifically is an electronic scale of low-cost LED display screen.

Background

The electronic scale converts a weight signal (or a pressure signal) into an analog voltage signal through the weighing sensor, the analog voltage signal is converted into a digital signal through the analog-to-digital converter to be processed by the single chip microcomputer, the single chip microcomputer displays weight information through the display screen according to keyboard commands and program control, and the display screen is generally divided into an LED nixie tube display screen and a liquid crystal display screen.

For a kitchen scale, a weighing scale or a balance displayed by an LED, the number of keys is usually 2-6, and the number of the character segments to be displayed on a display screen usually does not exceed 56 segments. Conventional schemes typically use dedicated display driver chips to drive LED display screens, such as TM1620, TM1668, etc.; and the number of keys driven by the single chip microcomputer is small, and the single chip microcomputer is usually provided with redundant IO ports which are not used.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

Not enough to prior art, the utility model provides an electronic scale of low-cost LED display screen has solved prior art's problem.

(II) technical scheme

In order to achieve the above object, the utility model provides a following technical scheme: the electronic scale comprises a power interface circuit, a switch key circuit, a power voltage stabilizing circuit, a weighing sensor, a single chip microcomputer, a keyboard, an LED display screen and a high-precision analog-to-digital converter chip, wherein the power interface circuit is electrically connected with the switch key circuit, the switch key circuit is electrically connected with the power voltage stabilizing circuit, the power voltage stabilizing circuit is electrically connected with the single chip microcomputer, the single chip microcomputer is electrically connected with the keyboard LED display screen, and the weighing sensor is electrically connected with the high-precision analog-to-digital converter chip.

Preferably, the power interface circuit is connected with the power adapter and the battery.

Preferably, the power supply voltage stabilizing circuit is used for stabilizing the voltage of the input battery and then supplying power to the single chip microcomputer.

Preferably, the load cell converts the pressure signal into an analog voltage signal.

Preferably, the single chip microcomputer converts an analog voltage signal output by the weighing sensor into a digital signal for processing, and then converts the digital signal into weight information to be displayed through the LED display screen.

Preferably, the LED display screen is used for displaying weight, units and the like.

Preferably, the single chip microcomputer is any one of a general single chip microcomputer and a single chip microcomputer integrating an analog-digital converter.

Preferably, the keyboard is electrically connected with the capacitive touch key control chip.

(III) advantageous effects

Compared with the prior art, the utility model provides an electronic scale of low-cost LED display screen possesses following beneficial effect:

1. the utility model uses the single-chip IO port to directly drive the LED display screen, thereby removing the special display driving chip and reducing the cost of the electronic scale;

2. the utility model adopts 1 IO port to realize the switch key, reduces the demand of the number of the IO ports of the single chip microcomputer, and reduces the cost of the electronic scale;

3. the utility model discloses a 6 mechanical button of 2 IO mouth drives, reduces the demand of singlechip IO mouth quantity, has reduced the cost of electronic scale.

Drawings

Fig. 1 is a schematic diagram of a power interface circuit of the present invention;

fig. 2 is a schematic diagram of the on/off key circuit of the present invention;

FIG. 3 is a schematic diagram of a power supply voltage stabilizing circuit of the present invention;

FIG. 4 is a schematic diagram of the connection between the weighing sensor and the single chip microcomputer of the present invention;

FIG. 5 is a schematic diagram of the keyboard of the present invention;

fig. 6 is a schematic diagram of the LED display screen of the present invention;

fig. 7 is a schematic diagram of the connection between the load cell and the high-precision adc chip according to the present invention;

fig. 8 is a schematic diagram of the capacitive touch key control chip of the present invention.

In the figure: the device comprises a power interface circuit 1, a power on/off key circuit 2, a power voltage stabilizing circuit 3, a weighing sensor 4, a single chip microcomputer 5, a keyboard 6, an LED display screen 7, a high-precision analog-to-digital converter chip 8 and a capacitance touch key control chip 9.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in figures 1-8

Example one

The utility model discloses an electronic scale of low-cost LED display screen, including power interface circuit 1, on & off key circuit 2, power voltage stabilizing circuit 3, weighing sensor 4, singlechip 5, keyboard 6 and LED display screen 7.

Further, the input of the power interface circuit 1 is respectively connected with a power adapter and a battery;

further, the power on/off key circuit 2 realizes the power on and off functions through 1 IO port: when the electronic scale is in a POWER-off state, POWER is equal to GND, Q1 is disconnected, Q2 is disconnected, and VOT is equal to GND; when the key is pressed down, Q2 is conducted, VOT is VIN, the singlechip 5 integrating the analog-digital converter is electrified to work, the POWER output logic is high, Q1 is conducted, and when the key is bounced open, Q2 is also in a conducting state due to the conduction of Q1, so that the starting operation is completed; when a key is pressed in a POWER-on state, the POWER level is pulled down, the single chip microcomputer 5 (the single chip microcomputer with the integrated analog-digital converter is selected) detects that the POWER is in a logic low state, the POWER outputs logic low, Q1 is disconnected, when the key is bounced off, Q2 is also disconnected, VOT is equal to GND, and therefore the POWER-off operation is completed.

Further, the power voltage stabilizing circuit 3 stabilizes the voltage of the input battery and supplies power to the singlechip 5 integrated with the analog-to-digital converter;

further, the signal of the weighing sensor 4 is input to a singlechip 5 integrated with an analog-to-digital converter;

further, the mechanical keyboard 6 drives 6 mechanical keys through 2 IO ports;

further, the LED display screen 7 drives 40 LEDs through 7 IO ports, and can drive up to 42 LEDs.

In this embodiment, the single chip microcomputer 5 is an analog-to-digital converter integrated with the HX 6002B.

Example two

The utility model discloses an electronic scale of low-cost LED display screen, including power interface circuit 1, electric capacity touch button control chip 9, power voltage stabilizing circuit 3, weighing sensor 4, integrated analog to digital converter's singlechip 5 and LED display screen 7.

Furthermore, the input of the power interface circuit 1 is connected with a power adapter and a battery, and the power interface circuit 1 comprises a power ship-shaped switch for controlling the startup and shutdown of the electronic scale;

further, the capacitive touch key control chip 9 is driven by 2 IO ports, and the number of the drivable touch keys depends on the selected capacitive touch control chip;

further, the power voltage stabilizing circuit 3 stabilizes the voltage of the input battery and supplies power to the single chip 5 (the single chip integrating the analog-to-digital converter);

further, the signal of the weighing sensor 4 is input into the singlechip 5;

In this embodiment, the single chip microcomputer 5 is an integrated analog-to-digital converter HX6002B, and the capacitive touch key control chip 9 is HX 610B.

EXAMPLE III

The utility model discloses an electronic scale of low-cost LED display screen, including power interface circuit 1, keyboard 6, power voltage stabilizing circuit 3, weighing sensor 4, general singlechip 5, high accuracy analog-to-digital converter chip 8 and LED display screen 7.

further, the keyboard 6 drives 6 mechanical keys by 2 IO ports;

further, the power voltage stabilizing circuit 3 stabilizes the voltage of the input battery and supplies power to the single chip 5 (integrated analog-to-digital converter) and the high-precision analog-to-digital converter chip 8;

further, the signal of the weighing sensor 4 is input to a high-precision analog-to-digital converter chip 8;

further, the high-precision analog-to-digital converter chip 8 is driven by 2 IO ports;

further, the LED display screen 7 drives 54 LEDs through 8 IO ports, and can drive 56 LEDs at most;

in this embodiment, the general-purpose single chip microcomputer 5 is SH88F2051AL, and the high-precision analog-to-digital converter chip 8 is HX 717.

The utility model discloses an electronic scale of low-cost LED demonstration through the IO mouth direct drive LED display screen who uses the singlechip, has reduced the electronic scale cost, and to a great extent has promoted the product competitiveness that LED shows the electronic scale.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an electronic scale of low-cost LED display screen, its characterized in that, includes power interface circuit (1), switch machine key circuit (2), power voltage stabilizing circuit (3), weighing sensor (4), singlechip (5), keyboard (6), LED display screen (7) and high accuracy analog to digital converter chip (8), power interface circuit (1) electric connection switch machine key circuit (2), switch machine key circuit (2) electric connection power voltage stabilizing circuit (3), power voltage stabilizing circuit (3) electric connection singlechip (5), singlechip (5) electric connection keyboard (6) LED display screen (7), weighing sensor (4) electric connection high accuracy analog to digital converter chip (8).

2. The electronic scale with the low-cost LED display screen as claimed in claim 1, wherein: the input of the power interface circuit (1) is connected with a power adapter and a battery.

3. The electronic scale with the low-cost LED display screen as claimed in claim 1, wherein: the power supply voltage stabilizing circuit (3) is used for stabilizing the voltage of an input battery and then supplying power to the singlechip (5).

4. The electronic scale with the low-cost LED display screen as claimed in claim 1, wherein: the weighing sensor (4) converts the pressure signal into an analog voltage signal.

5. The electronic scale with the low-cost LED display screen as claimed in claim 1, wherein: the single chip microcomputer (5) converts an analog voltage signal output by the weighing sensor (4) into a digital signal for processing, and then converts the digital signal into weight information to be displayed through the LED display screen (7).

6. The electronic scale with the low-cost LED display screen as claimed in claim 1, wherein: the single chip microcomputer (5) is any one of a general single chip microcomputer and a single chip microcomputer integrating an analog-digital converter.

7. The electronic scale with the low-cost LED display screen as claimed in claim 1, wherein: the keyboard (6) is electrically connected with the capacitive touch key control chip (9).