CN110211394B - Display screen delay device based on Schmitt trigger - Google Patents
Display screen delay device based on Schmitt trigger Download PDFInfo
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- CN110211394B CN110211394B CN201910620802.5A CN201910620802A CN110211394B CN 110211394 B CN110211394 B CN 110211394B CN 201910620802 A CN201910620802 A CN 201910620802A CN 110211394 B CN110211394 B CN 110211394B
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- 230000008054 signal transmission Effects 0.000 claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims description 22
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 206010021033 Hypomenorrhoea Diseases 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/07—Controlling traffic signals
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention provides a display screen delay device based on a Schmitt trigger, which comprises: the system comprises a Schmitt delay module, a microcontroller, a signal transmission module and a power supply module; the input end of the Schmitt delay module is used for receiving an input control signal sent by a signal machine; the output end of the Schmitt delay module is connected with one input end of the microcontroller; one output end of the microcontroller is connected with the input end of the signal transmission module, and the output end of the signal transmission module is used for being connected with the LED display screen; the power supply module is used for providing power to the Schmidt time delay module, the microcontroller and the signal transmission module. The delay time of the Schmitt delay module is set to be longer than the period time when the input control signal becomes a pulse signal. The invention realizes continuous display of programs on the LED display screen when the signal lamp flickers.
Description
Technical Field
The invention relates to a traffic signal control device, in particular to a display screen delay device based on a Schmitt trigger.
Background
Pedestrian safety is an important component of urban traffic safety, and aims at the problems of strong walking randomness and changeable direction existing in the participation of pedestrians in road traffic, so that the pedestrian crossing safety is ensured, and the pedestrian crossing reminding and traffic safety propaganda functions are realized by using the combination of a crosswalk signal lamp and an LED display screen to solve the pedestrian safety problem.
The crosswalk signal lamp at present needs to flash for 6 seconds before the green light period is finished, the flash period is 250 milliseconds, and the LED display screen can also flash along with the same signal line.
According to the requirement, the LED display screen needs to be kept always on in the period of time, and the function of no flicker can not be realized under the condition of not adding an independent signal line.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a display screen delay device based on a Schmitt trigger, wherein when a control signal is input into a pulse signal which causes a signal lamp to flash, an output control signal with a continuous constant level is output through a delay circuit by utilizing the hysteresis phenomenon of the Schmitt trigger, so that an LED display screen is continuously displayed; the technical scheme adopted by the invention is as follows:
a schmitt trigger-based display screen delay device comprising: the system comprises a Schmitt delay module, a microcontroller, a signal transmission module and a power supply module;
the input end of the Schmitt delay module is used for receiving an input control signal sent by a signal machine;
the output end of the Schmitt delay module is connected with one input end of the microcontroller; one output end of the microcontroller is connected with the input end of the signal transmission module, and the output end of the signal transmission module is used for being connected with the LED display screen;
the power supply module is used for providing power to the Schmidt time delay module, the microcontroller and the signal transmission module.
Further, when the received input control signal is a pulse signal, the schmitt delay module outputs a continuous high-level or low-level signal to the microcontroller, and the microcontroller outputs a continuous constant-level output control signal so that the display screen continuously displays.
Further, the delay time of the schmitt delay module is set to be longer than the period time when the input control signal becomes a pulse signal.
Further, the schmitt delay module includes: schmitt trigger U1, resistor R1, capacitor C1;
the external capacitor/resistor pin of the Schmitt trigger U1 is connected with one end of a resistor R1 and one end of a capacitor C1, and the other end of the resistor R1 is connected with a positive voltage VCC; the external capacitor pin of the Schmitt trigger U1 is connected with the other end of the capacitor C1 and the ground; the negative edge trigger end of the Schmitt trigger U1 is grounded, and the positive edge trigger end is connected with an input control signal;
one inverting output end of the Schmitt trigger U1 is connected with the microcontroller;
the resistor R1 and the capacitor C1 are used for setting the delay time length, and the delay time length of the Schmitt delay module is set to be longer than the period time when an input control signal is changed into a pulse signal.
Further, the resistor R1 was set to 300K ohms, and the capacitor C1 was set to 2 μf.
Further, the non-inverting output terminal of the schmitt trigger U1 is connected to the anode of the light emitting diode D1, and the cathode of the light emitting diode D1 is grounded through the resistor R2.
The invention has the advantages that: when the signal machine controls the signal lamp and the LED display screen by using the same signal wire, the device avoids the problem that the signal lamp flickers and the display of the LED display screen also follows the flickering; the continuous display of the program on the display screen is realized.
Drawings
FIG. 1 is a schematic diagram of the structural composition of the present invention.
Fig. 2 is a schematic diagram of a schmitt delay module according to the present invention.
Detailed Description
The invention will be further described with reference to the following specific drawings and examples.
As shown in fig. 1, the display screen delay device based on the schmitt trigger provided by the invention comprises a schmitt delay module, a microcontroller, a signal transmission module and a power supply module;
the input end of the Schmitt delay module is used for receiving an input control signal sent by a signal machine;
the output end of the Schmitt delay module is connected with one input end of the microcontroller; one output end of the microcontroller is connected with the input end of the signal transmission module, and the output end of the signal transmission module is used for being connected with the LED display screen;
the power supply module is used for providing power to the Schmidt delay module, the microcontroller and the signal transmission module;
the Schmitt delay module outputs a continuous high-level or low-level signal to the microcontroller when the received input control signal is a pulse signal, and the microcontroller outputs a continuous constant-level (high-level or low-level) output control signal so that the LED display screen continuously displays;
an example circuit of a schmitt delay module is shown in fig. 2, comprising: schmitt trigger U1, resistor R1, capacitor C1; u1 is specifically 74HC123;
the external capacitor/resistor pin (15 pins) of the Schmitt trigger U1 is connected with one end of a resistor R1 and one end of a capacitor C1, and the other end of the resistor R1 is connected with a positive voltage VCC; the external capacitor pin (14 pins) of the Schmitt trigger U1 is connected with the other end of the capacitor C1 and the ground; the negative edge trigger end (1 pin) of the Schmitt trigger U1 is grounded, and the positive edge trigger end (2 pins) is connected with an input control signal; wherein VCC is 3.3v;
one reverse phase output end (4 pins) of the Schmitt trigger U1 is connected with the microcontroller; the in-phase output end of the Schmitt trigger U1 is connected with the anode of the light-emitting diode D1, and the cathode of the light-emitting diode D1 is grounded through a resistor R2;
the resistor R1 and the capacitor C1 are used for setting the delay time length, and the delay time length of the Schmitt delay module is set to be longer than the period time when an input control signal is changed into a pulse signal, for example, the delay time length of the Schmitt delay module is 600ms and longer than the period time of the pulse signal of 250 ms; at this time, the resistor R1 may be set to 300 Kohm, and the capacitor C1 may be set to 2 μF;
when the input control signal is at a high level, the inverting output terminal (4 pins) of the schmitt trigger U1 outputs a low level; when the input control signal is converted into a pulse signal, one rising edge of the pulse signal enables the inverting output end (4 feet) of the Schmitt trigger U1 to output low level, the positive edge triggering end (2 feet) of the U1 detects the rising edge signal again within the delay time of 600ms, the low level time of the inverting output end (4 feet) of the Schmitt trigger U1 is increased to 600ms again, and the operation is repeated in such a way that the inverting output end (4 feet) of the U1 continuously outputs low level within the green light flickering period of the signal lamp; the microcontroller is set to be triggered by low level, and the LED display screen is controlled to continuously display the current program;
in other embodiments, the schmitt trigger U1 may also be connected to a falling edge trigger, and output a continuous high level in a delay time; the negative edge trigger end (1 foot) of the U1 is connected with an input control signal, and the positive edge trigger end (2 feet) is grounded; the in-phase output end (13 feet) is connected with the microcontroller; the microcontroller is set to high level trigger.
In actual implementation, according to the actual condition of the crossing and different requirements, the values of the resistor and the capacitor can be adjusted to meet the requirements of different input control signals.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present invention.
Claims (4)
1. A schmitt trigger-based display screen delay device, comprising: the system comprises a Schmitt delay module, a microcontroller, a signal transmission module and a power supply module;
the input end of the Schmitt delay module is used for receiving an input control signal sent by a signal machine;
the output end of the Schmitt delay module is connected with one input end of the microcontroller; one output end of the microcontroller is connected with the input end of the signal transmission module, and the output end of the signal transmission module is used for being connected with the LED display screen;
the power supply module is used for providing power to the Schmidt delay module, the microcontroller and the signal transmission module;
the Schmitt delay module outputs a continuous high-level or low-level signal to the microcontroller when the received input control signal is a pulse signal, and the microcontroller outputs a continuous constant-level output control signal so that the display screen continuously displays;
the delay time of the Schmitt delay module is set to be longer than the period time when the input control signal becomes a pulse signal.
2. The schmitt trigger-based display delay apparatus of claim 1,
the schmitt delay module comprises: schmitt trigger U1, resistor R1, capacitor C1;
the external capacitor/resistor pin of the Schmitt trigger U1 is connected with one end of a resistor R1 and one end of a capacitor C1, and the other end of the resistor R1 is connected with a positive voltage VCC; the external capacitor pin of the Schmitt trigger U1 is connected with the other end of the capacitor C1 and the ground; the negative edge trigger end of the Schmitt trigger U1 is grounded, and the positive edge trigger end is connected with an input control signal;
one inverting output end of the Schmitt trigger U1 is connected with the microcontroller;
the resistor R1 and the capacitor C1 are used for setting the delay time length, and the delay time length of the Schmitt delay module is set to be longer than the period time when an input control signal is changed into a pulse signal.
3. The schmitt trigger-based display delay apparatus of claim 2,
resistor R1 was set to 300 Kohm, and capacitor C1 was set to 2 μF.
4. The schmitt trigger-based display delay apparatus of claim 2,
the in-phase output end of the Schmitt trigger U1 is connected with the anode of the light-emitting diode D1, and the cathode of the light-emitting diode D1 is grounded through a resistor R2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910620802.5A CN110211394B (en) | 2019-07-10 | 2019-07-10 | Display screen delay device based on Schmitt trigger |
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| CN201910620802.5A CN110211394B (en) | 2019-07-10 | 2019-07-10 | Display screen delay device based on Schmitt trigger |
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| CN110211394A CN110211394A (en) | 2019-09-06 |
| CN110211394B true CN110211394B (en) | 2024-04-12 |
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