CN215987258U - Handwriting board control circuit - Google Patents
Handwriting board control circuit Download PDFInfo
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- CN215987258U CN215987258U CN202120198463.9U CN202120198463U CN215987258U CN 215987258 U CN215987258 U CN 215987258U CN 202120198463 U CN202120198463 U CN 202120198463U CN 215987258 U CN215987258 U CN 215987258U
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Abstract
The utility model discloses a handwriting board control circuit, which comprises: a controller; the liquid crystal display film is electrically connected with the controller; a battery electrically connected to the controller; the first switch is electrically connected with the controller; the second switch is electrically connected with the controller; and the detection circuit is electrically connected with the battery. Whether the use environment leaks electricity can be detected through the detection circuit, and safety of children is protected.
Description
Technical Field
The utility model relates to the technical field of a control circuit of a handwriting board.
Background
The writing pad belongs to a children writing pad, and the inside of the writing pad is displayed by an LCD liquid crystal display film. The current parents attach more and more importance to the safety of children, worry that children are injured because certain place electric leakage in the family leads to children, especially some are in safe voltage, and the voltage is not high, and when the risk point is unclear, if children will appear dangerously when using the handwriting pad in this position. If the handwriting board can detect that the position is at a high potential position, the safety of children is reminded.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provides a handwriting board control circuit which can control a handwriting board and detect whether the handwriting board is positioned at a high potential position or not, and has the advantage of a prompt function.
The technical scheme adopted by the utility model is as follows:
handwriting pad control circuit, it includes:
a controller;
the liquid crystal display film is electrically connected with the controller;
a battery electrically connected to the controller;
the first switch is electrically connected with the controller;
the second switch is electrically connected with the controller;
a detection circuit electrically connected to the battery; the detection circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first diode, a second diode, a third diode, a fourth diode and a chip, wherein three NOT gates are arranged in the chip and respectively comprise a first NOT gate, a second NOT gate, a third NOT gate and a triode; the cathode of the first resistor is electrically connected with the anode of the first diode, the cathode of the first diode is electrically connected with the base level of the triode, and the collector of the triode is electrically connected with the anode of the second diode and the anode of the third diode; the emitting electrode of the triode is electrically connected with the anode of the fourth resistor and the anode of the third NOT gate, the cathode of the fourth resistor is grounded, and the cathode of the third NOT gate is electrically connected with the cathode of the second resistor; the anode of the second resistor is electrically connected with the cathode of the third diode, and the anode of the third resistor is electrically connected with the cathode of the second diode; the positive pole of the first resistor is electrically connected with the detection point, the positive pole of the first resistor is electrically connected with the negative pole of the fourth diode, the positive pole of the fourth diode is electrically connected with the positive pole of the first NOT gate, the negative pole of the first NOT gate is electrically connected with the positive pole of the second NOT gate, and the negative pole of the second NOT gate is electrically connected with the negative pole of the third resistor.
The second diode and the third diode are both light emitting diodes, and the resistance value of the first resistor is 1 k.
The chip is a chip of an IC74LS04 model.
The first switch is an erasing key and the second switch is a locking key. The liquid crystal display film is used for displaying handwriting. The emphasis is on the detection circuit. The monitoring point is provided with a probe, when the probe detects a low level signal, the low level signal is transmitted to the first NOT gate through the fourth diode and is inverted, the second NOT gate outputs a low level, and the second diode emits light; when the probe detects a high level signal, the triode is conducted, the emitter of the triode outputs a high level, the high level is inverted by the third NOT gate and then becomes a low level, and the third diode is lightened. When the signal is a continuous digital stream signal, the second diode and the third diode alternately emit light, and when the signal frequency is higher, the second diode and the third diode are in a full-bright state.
The utility model has the beneficial effects that: the handwriting board can be controlled, and whether the handwriting board is at a high potential position or not can be detected, so that the handwriting board has the advantage of a prompt function.
Drawings
FIG. 1 is a schematic diagram of the principles of the present invention;
fig. 2 is a schematic diagram of the detection circuit of the present invention.
Detailed Description
As shown in fig. 1 and 2, the handwriting board control circuit of the present invention includes:
a controller;
the liquid crystal display film is electrically connected with the controller;
a battery electrically connected to the controller;
the first switch is electrically connected with the controller;
the second switch is electrically connected with the controller;
a detection circuit A1 electrically connected with the battery; the detection circuit A1 comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first diode VD2, a second diode VD2, a third diode VD3, a fourth diode VD1 and a chip, wherein three NOT gates are arranged in the chip and are respectively a first NOT gate 1, a second NOT gate 2, a third NOT gate 3 and a triode VT 1; the negative electrode of the first resistor R1 is electrically connected with the positive electrode of the first diode VD4, the negative electrode of the first diode VD4 is electrically connected with the base level of the triode VT1, and the collector electrode of the triode VT1 is electrically connected with the positive electrode of the second diode VD2 and the positive electrode of the third diode VD 3; an emitter of the triode VT1 is electrically connected to the anode of the fourth resistor R4 and the anode of the third not gate 3, the cathode of the fourth resistor R4 is grounded, and the cathode of the third not gate 3 is electrically connected to the cathode of the second resistor R2; the anode of the second resistor R2 is electrically connected with the cathode of the third diode VD3, and the anode of the third resistor R3 is electrically connected with the cathode of the second diode VD 2; the positive electrode of the first resistor R1 is electrically connected to a detection point, the positive electrode of the first resistor R1 is electrically connected to the negative electrode of the fourth diode VD1, the positive electrode of the fourth diode VD1 is electrically connected to the positive electrode of the first not gate 1, the negative electrode of the first not gate 1 is electrically connected to the positive electrode of the second not gate 2, and the negative electrode of the second not gate 2 is electrically connected to the negative electrode of the third resistor R3.
The second diode VD2 and the third diode VD3 are both light emitting diodes, and the resistance of the first resistor R1 is 1 k.
The chip is a chip of an IC74LS04 model.
The first switch is an erasing key and the second switch is a locking key. The liquid crystal display film is used for displaying handwriting. The focus is on the detection circuit a 1. The monitoring point is provided with a probe, when the probe detects a low-level signal, the low-level signal is transmitted to the first NOT gate 1 through the fourth diode VD1 and is inverted, the second NOT gate 2 outputs a low level, and the second diode VD2 emits light; when the probe detects a high-level signal, the triode VT1 is conducted, the emitter thereof outputs a high level, the high level is inverted by the third NOT gate 3 and becomes a low level, and the third diode VD3 is lightened. When the signal is a continuous digital stream signal, the second diode VD2 and the third diode VD3 alternately emit light, and when the signal frequency is higher, the second diode VD2 and the third diode VD3 are in a full-bright state.
The utility model has the beneficial effects that: the handwriting board can be controlled, and whether the handwriting board is at a high potential position or not can be detected, so that the handwriting board has the advantage of a prompt function.
Claims (3)
1. Handwriting pad control circuit, its characterized in that includes:
a controller;
the liquid crystal display film is electrically connected with the controller;
a battery electrically connected to the controller;
the first switch is electrically connected with the controller;
the second switch is electrically connected with the controller;
a detection circuit electrically connected to the battery; the detection circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first diode, a second diode, a third diode, a fourth diode and a chip, wherein three NOT gates are arranged in the chip and respectively comprise a first NOT gate, a second NOT gate, a third NOT gate and a triode; the cathode of the first resistor is electrically connected with the anode of the first diode, the cathode of the first diode is electrically connected with the base level of the triode, and the collector of the triode is electrically connected with the anode of the second diode and the anode of the third diode; the emitting electrode of the triode is electrically connected with the anode of the fourth resistor and the anode of the third NOT gate, the cathode of the fourth resistor is grounded, and the cathode of the third NOT gate is electrically connected with the cathode of the second resistor; the anode of the second resistor is electrically connected with the cathode of the third diode, and the anode of the third resistor is electrically connected with the cathode of the second diode; the positive pole of the first resistor is electrically connected with the detection point, the positive pole of the first resistor is electrically connected with the negative pole of the fourth diode, the positive pole of the fourth diode is electrically connected with the positive pole of the first NOT gate, the negative pole of the first NOT gate is electrically connected with the positive pole of the second NOT gate, and the negative pole of the second NOT gate is electrically connected with the negative pole of the third resistor.
2. The handwriting pad control circuit of claim 1, wherein: the second diode and the third diode are both light emitting diodes, and the resistance value of the first resistor is 1 k.
3. The handwriting pad control circuit of claim 1, wherein: the chip is a chip of an IC74LS04 model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120198463.9U CN215987258U (en) | 2021-01-25 | 2021-01-25 | Handwriting board control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120198463.9U CN215987258U (en) | 2021-01-25 | 2021-01-25 | Handwriting board control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215987258U true CN215987258U (en) | 2022-03-08 |
Family
ID=80567451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120198463.9U Active CN215987258U (en) | 2021-01-25 | 2021-01-25 | Handwriting board control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215987258U (en) |
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2021
- 2021-01-25 CN CN202120198463.9U patent/CN215987258U/en active Active
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