A shuttle knob control circuit

Abstract

The application discloses a shuttle knob control circuit. The shuttle knob control circuit is arranged to detect the rotation state of the shuttle knob and whether the shuttle knob is pressed by using a single-chip microcomputer, and then the up-page and down-page control can be realized, and the signal stability is high.

Description

Technical Field

[0001] This utility model relates to the field of smart energy meter application technology, and in particular to a shuttle knob control circuit. Background Technology

[0002] A smart meter is an advanced electricity metering device that is digital, networked, and capable of two-way communication. It is not merely a simple replacement for traditional mechanical or electronic meters, but a core component of smart grids.

[0003] Traditional smart meters mostly use mechanical buttons or membrane buttons as input methods, which have the following drawbacks: short button life: mechanical buttons are prone to aging, and contact oxidation after long-term use can lead to malfunction; inconvenient operation: when there are many display pages, it is necessary to repeatedly press the buttons to switch pages, resulting in a poor user experience. Utility Model Content

[0004] The purpose of this application is to provide a rotary knob control circuit to solve the problems of existing mechanical buttons being prone to aging, contact oxidation leading to malfunction after long-term use, and the need to repeatedly press the button to switch pages when there are many pages displayed, resulting in a poor user experience.

[0005] To solve the above-mentioned technical problems, this application provides a shuttle knob control circuit, including:

[0006] The system includes a microcontroller, a rotary knob, a first pull-up resistor, a second pull-up resistor, a first current-limiting resistor, a second current-limiting resistor, and a filter resistor. Pin A of the rotary knob is connected to the first terminals of the first current-limiting resistor and the first pull-up resistor. Pin B of the rotary knob is connected to the first terminals of the second current-limiting resistor and the second pull-up resistor. The second terminals of both the first and second pull-up resistors are connected to a power supply. The second terminals of the first and second current-limiting resistors are connected to the first and second signal terminals of the microcontroller. Pin E of the rotary knob is connected to the first terminal of the filter resistor. The second terminal of the filter resistor is connected to the third signal terminal of the microcontroller. The remaining pins of the rotary knob are grounded.

[0007] In a preferred embodiment, a rotary knob control circuit further includes a third pull-up resistor, the first end of which is connected to the first end of the filter resistor, and the second end of which is connected to a power supply.

[0008] In a preferred embodiment, a rotary knob control circuit further includes a first filter capacitor and a second filter capacitor. The first end of the first filter capacitor is connected to the second end of the first current-limiting resistor, and the first end of the second filter capacitor is connected to the second end of the second current-limiting resistor. The second ends of both the first filter capacitor and the second filter capacitor are grounded.

[0009] In a preferred embodiment, a rotary knob control circuit further includes a third filter capacitor, wherein the first end of the third filter capacitor is connected to the second end of the filter resistor, and the second end of the third filter capacitor is grounded.

[0010] Compared with the prior art, the rotary knob control circuit provided by this utility model can detect the rotation state of the rotary knob and whether it is pressed by a microcontroller, thereby realizing page up and page down control, and the signal stability is stronger. Attached Figure Description

[0011] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0012] Figure 1 A schematic diagram of a smart energy meter with a mechanical shuttle knob provided in an embodiment of this application;

[0013] Figure 2 This is a schematic diagram of a shuttle knob control circuit provided in an embodiment of this application;

[0014] Figure 3 A flowchart illustrating the operation of a rotary knob provided in this application embodiment;

[0015] In the diagram: 1. Electricity meter body; 2. Anti-slip texture; 3. Shuttle knob; 4. Dot-matrix LCD screen; 31. First pull-up resistor; 32. Second pull-up resistor; 33. First current-limiting resistor; 34. Second current-limiting resistor; 35. Filter resistor; 36. Third pull-up resistor; 37. First filter capacitor; 38. Second filter capacitor; 39. Third filter capacitor. Detailed Implementation

[0016] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0017] The core of this application is to provide a rotary knob control circuit that solves the problems of existing mechanical buttons being prone to aging, contact oxidation leading to malfunction after long-term use, and the need to repeatedly press the button to switch pages when there are many pages displayed, resulting in a poor user experience.

[0018] Figure 1 This is a schematic diagram of a smart energy meter with a mechanical shuttle knob, provided as an embodiment of this application. Figure 2 This is a schematic diagram of a shuttle knob control circuit provided in an embodiment of this application. Figure 3 A flowchart of a shuttle knob provided in this application embodiment is shown below. Figures 1 to 3 As shown.

[0019] A smart energy meter with a mechanical rotary knob includes an energy meter body 1, on which a rotary knob 3 and a dot-matrix LCD screen 4 are mounted. In use, rotating the rotary knob 3 to its designated position and then pressing it down allows for page turning. The rotary knob 3 has anti-slip textured surfaces 2. The dot-matrix LCD screen 4 displays various data.

[0020] To provide a detailed explanation of the control of the rotary knob, a rotary knob control circuit is also provided, including: a microcontroller, a rotary knob 3, a first pull-up resistor 31, a second pull-up resistor 32, a first current-limiting resistor 33, a second current-limiting resistor 34, and a filter resistor 35. Pin A of the rotary knob 3 is connected to the first terminals of the first current-limiting resistor 33 and the first pull-up resistor 31, respectively. Pin B of the rotary knob 3 is connected to the first terminals of the second current-limiting resistor 34 and the second pull-up resistor 32, respectively. The second terminals of both the first pull-up resistor 31 and the second pull-up resistor 32 are connected to the power supply VDD. The second terminals of the first current-limiting resistor 33 and the second current-limiting resistor 34 are connected to the first signal terminal and the second signal terminal of the microcontroller, respectively. Pin E of the rotary knob 3 is connected to the first terminal of the filter resistor 35, and the second terminal of the filter resistor 35 is connected to the third signal terminal of the microcontroller. The remaining pins of the rotary knob 3 are grounded. Human-computer interaction is achieved through the rotary knob 3.

[0021] In a preferred embodiment, a rotary knob control circuit further includes a third pull-up resistor 36, the first end of which is connected to the first end of a filter resistor 35, and the second end of which is connected to a power supply.

[0022] In a preferred embodiment, a rotary knob control circuit further includes a first filter capacitor 37 and a second filter capacitor 38. The first end of the first filter capacitor 37 is connected to the second end of the first current-limiting resistor 33, and the first end of the second filter capacitor 38 is connected to the second end of the second current-limiting resistor 34. The second ends of both the first filter capacitor 37 and the second filter capacitor 38 are grounded.

[0023] In a preferred embodiment, a shuttle knob control circuit further includes a third filter capacitor 39, the first end of which is connected to the second end of a filter resistor 35, and the second end of the third filter capacitor 39 is grounded.

[0024] The working principle of the rotary knob control circuit is as follows:

[0025] When the microcontroller detects a falling edge of the KNOB_A signal and KNOB_B is high, it assumes that the rotary knob 3 is rotating clockwise. If the KNOB_A signal is a falling edge and KNOB_B is low, it assumes that the rotary knob 3 is rotating counterclockwise. When the microcontroller detects a low KNOB_OK signal, it assumes that the rotary knob 3 is pressed.

[0026] Table 1. Signal waveforms when the shuttle knob is in operation

[0027]

[0028] The shuttle knob control circuit provided by this utility model can...

[0029] The microcontroller can detect the rotation state of the shuttle knob 3 and whether it is pressed, and thus...

[0030] It enables page up and page down control with strong signal stability.

[0031] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and incorporate common knowledge or customary techniques in the art disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of this application is indicated by the claims.

[0032] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of this application described above do not constitute a limitation on the scope of protection of this application.

Claims

1. A rotary knob control circuit, characterized in that, include: The microcontroller includes a rotary knob (3), a first pull-up resistor (31), a second pull-up resistor (32), a first current-limiting resistor (33), a second current-limiting resistor (34), and a filter resistor (35). The A pin of the rotary knob (3) is connected to the first end of the first current-limiting resistor (33) and the first pull-up resistor (31), respectively. The B pin of the rotary knob (3) is connected to the first end of the second current-limiting resistor (34) and the second pull-up resistor (32), respectively. The second ends of the first pull-up resistor (31) and the second pull-up resistor (32) are both connected to the power supply. The second ends of the first current-limiting resistor (33) and the second current-limiting resistor (34) are connected to the first signal terminal and the second signal terminal of the microcontroller, respectively. The E pin of the rotary knob (3) is connected to the first end of the filter resistor (35), and the second end of the filter resistor (35) is connected to the third signal terminal of the microcontroller. The remaining pins of the rotary knob (3) are grounded.

2. The shuttle knob control circuit according to claim 1, characterized in that, It also includes a third pull-up resistor (36), the first end of which is connected to the first end of the filter resistor (35), and the second end of which is connected to the power supply.

3. The shuttle knob control circuit according to claim 1, characterized in that, It also includes a first filter capacitor (37) and a second filter capacitor (38). The first end of the first filter capacitor (37) is connected to the second end of the first current limiting resistor (33), and the first end of the second filter capacitor (38) is connected to the second end of the second current limiting resistor (34). The second ends of the first filter capacitor (37) and the second filter capacitor (38) are both grounded.

4. The shuttle knob control circuit according to claim 1, characterized in that, It also includes a third filter capacitor (39), the first end of which is connected to the second end of the filter resistor (35), and the second end of the third filter capacitor (39) is grounded.

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