CN109121255A - A kind of control circuit controlling the operation of two LED light using single I/O port - Google Patents
A kind of control circuit controlling the operation of two LED light using single I/O port Download PDFInfo
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- CN109121255A CN109121255A CN201811170592.6A CN201811170592A CN109121255A CN 109121255 A CN109121255 A CN 109121255A CN 201811170592 A CN201811170592 A CN 201811170592A CN 109121255 A CN109121255 A CN 109121255A
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- led light
- output end
- resistance
- control circuit
- port
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
- Led Devices (AREA)
Abstract
The present invention provides a kind of control circuit that the operation of two LED light is controlled using single I/O port, including the central processor unit for carrying out I/O port signal output, the LED running control circuit unit that is connected with the IO output end of the central processor unit；The LED running control circuit unit includes No.1 LED light, No. two LED light, resistance R3 and NPN type triode Q1, the input terminal of the No.1 LED light, No. two LED light and resistance R3 all connects supply voltage VDD, and the output end of No. two LED light is connected with the collector of NPN type triode Q1；The emitter of the NPN type triode connects publicly, and base stage is connected with the output end of resistance R3；It is also connected with a diode D3 between the output end of the No.1 LED light and the output end of resistance R3, in actual moving process, control circuit of the invention can not only save the resource of I/O port, and circuit is simple, can save a MOSFET control, and integrated level is high.
Description
[technical field]
The present invention relates to LED light control circuit technical field, more particularly to a kind of can to save significantly on cost, integrated level high
The control circuit of two LED light operation is controlled using single I/O port.
[background technique]
The method that conventional one-piece machine drives LED light, substantially working principle are as follows: when MCU IO1 output is high, Q11 foot voltage
To be low, Q1 conducting, there is voltage at the both ends LED1 at this time, so lamp is bright, such circuit design makes single I/O port that can only control one
The operation of a LED light, however, the I/O port of single-chip microcontroller is a very limited resource, many products all have LED indication function, refer to
Show the different conditions of product operation, for example red light is bright when product charges, green light when fully charged, most of product on the market at present
All a function is often sacrificed in this way in the case where some single-chip I/O mouth resources are not enough with two I/O port driving instructions
It can be to achieve the purpose that product may be used.
Based on this, how more LED light operations could be controlled, are those skilled in the art in the limited situation of I/O port
Member often considers the problems of, has also carried out a large amount of research and development and experiment, and achieve preferable achievement.
[summary of the invention]
To overcome the problems of prior art, the present invention provides a kind of two LED light of single I/O port control of utilization and runs
Control circuit, more particularly to it is a kind of can save significantly on cost, integrated level it is high control two LED light operations using single I/O port
Control circuit.
The scheme that the present invention solves technical problem is to provide a kind of control electricity that two LED light operations are controlled using single I/O port
Road, including for carrying out I/O port signal output central processor unit, with the IO output end phase of the central processor unit
The LED running control circuit unit of connection；The LED running control circuit unit includes No.1 LED light, No. two LED light, resistance
The input terminal of R3 and NPN type triode Q1, the No.1 LED light, No. two LED light and resistance R3 all connect supply voltage VDD,
And the output end of No. two LED light is connected with the collector of NPN type triode Q1；The emitter of the NPN type triode connects public affairs
Altogether, base stage is connected with the output end of resistance R3；Between the output end of the No.1 LED light and the output end of resistance R3
It is also connected with a diode D3, the input terminal of diode D3 is connected with the output end of resistance R3, the output end of diode D3
It is connected with the output end of No.1 LED light.
Preferably, the central processing unit is internally provided with an enhanced N-channel field-effect tube, and the leakage of the field-effect tube
Pole is connected with the IO output end of central processor unit, and the grid of the field-effect tube is connected with logic I/O, the field-effect
The source electrode of pipe connects publicly.
Preferably, it is also serially connected with electricity respectively on the connecting line of the No.1 LED light and No. two LED light and supply voltage VDD
Hinder R1 and resistance R2.
Preferably, resistance R4 is also connected between the input terminal of the diode D3 and the output end of resistance R3.
Compared with prior art, a kind of control circuit for controlling the operation of two LED light using single I/O port of the present invention passes through same
When be arranged for carrying out the central processor unit of I/O port signal output, being connected with the IO output end of the central processor unit
The LED running control circuit unit connect, and LED running control circuit unit is designed to include No.1 LED light, No. two LED
Lamp, resistance R3 and NPN type triode Q1, in actual moving process, control circuit of the invention can not only save the money of I/O port
Source, and circuit is simple, can save a MOSFET control, and integrated level is high.
[Detailed description of the invention]
Fig. 1 is a kind of circuit diagram for the control circuit that the operation of two LED light is controlled using single I/O port of the present invention.
[specific embodiment]
To make the purpose of the present invention, technical solution and advantage are more clearly understood, with reference to the accompanying drawings and embodiments, to this
Invention is further elaborated.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, not
For limiting the invention.
Referring to Fig. 1, the present invention it is a kind of utilize single I/O port control the control circuit 1 that two LED light are run include for into
The central processor unit of row I/O port signal output, the LED operation being connected with the IO output end of the central processor unit
Control circuit unit；The LED running control circuit unit includes No.1 LED light, No. two LED light, resistance R3 and NPN type three
Pole pipe Q1, the input terminal of the No.1 LED light, No. two LED light and resistance R3 all connect supply voltage VDD, and No. two LED light
Output end is connected with the collector of NPN type triode Q1；The emitter of the NPN type triode connects publicly, base stage with
The output end of resistance R3 is connected；One or two are also connected between the output end of the No.1 LED light and the output end of resistance R3
The input terminal of pole pipe D3, diode D3 are connected with the output end of resistance R3, output end and the No.1 LED light of diode D3
Output end is connected.
The present invention passes through while central processor unit and the central processing for carrying out I/O port signal output is arranged
The LED running control circuit unit that the IO output end of device unit is connected, and LED running control circuit unit is designed to wrap
Include No.1 LED light, No. two LED light, resistance R3 and NPN type triode Q1, in actual moving process, control circuit of the invention
The resource of I/O port can not only be saved, and circuit is simple, a MOSFET control can be saved, integrated level is high.
Preferably, the central processing unit is internally provided with an enhanced N-channel field-effect tube, and the leakage of the field-effect tube
Pole is connected with the IO output end of central processor unit, and the grid of the field-effect tube is connected with logic I/O, the field-effect
The source electrode of pipe connects publicly.
Preferably, it is also serially connected with electricity respectively on the connecting line of the No.1 LED light and No. two LED light and supply voltage VDD
Hinder R1 and resistance R2.
Preferably, resistance R4 is also connected between the input terminal of the diode D3 and the output end of resistance R3.
Single-chip I/O mouth connects the drain electrode in one MOSFET in inside.When Logic is set as 1, I/O port is low, Logic setting
When being 0, I/O port is in high-impedance state.
When MCU IO is low, there is voltage at No.1 LED light both ends, so No.1 LED light is bright, 1 foot of Q1 is low, Q1 at this time
Cut-off, No. two LED light both ends are without pressure difference, so No. two LED light do not work.When MCU IO be high-impedance state when, No.1 LED light both ends without
Pressure difference, No.1 LED light do not work.1 foot of Q1 is because R3 is connected to VDD, so Q1 is connected, there are pressure difference, No. two LED in No. two LED light both ends
Lamp is lighted.
Compared with prior art, a kind of control circuit 1 for controlling the operation of two LED light using single I/O port of the present invention passes through same
When be arranged for carrying out the central processor unit of I/O port signal output, being connected with the IO output end of the central processor unit
The LED running control circuit unit connect, and LED running control circuit unit is designed to include No.1 LED light, No. two LED
Lamp, resistance R3 and NPN type triode Q1, in actual moving process, control circuit of the invention can not only save the money of I/O port
Source, and circuit is simple, can save a MOSFET control, and integrated level is high.
The embodiments of the present invention described above are not intended to limit the scope of the present invention.It is any in the present invention
Spirit and principle within made modifications, equivalent substitutions and improvements etc., should be included in claim protection model of the invention
Within enclosing.
Claims (4)
1. a kind of control circuit for controlling the operation of two LED light using single I/O port, it is characterised in that: including for carrying out I/O port letter
The central processor unit of number output, the LED running control circuit that is connected with the IO output end of the central processor unit
Unit；The LED running control circuit unit includes No.1 LED light, No. two LED light, resistance R3 and NPN type triode Q1,
The input terminal of the No.1 LED light, No. two LED light and resistance R3 all connects supply voltage VDD, and the output end of No. two LED light
It is connected with the collector of NPN type triode Q1；The emitter of the NPN type triode connects publicly, base stage and resistance R3
Output end be connected；A diode D3 is also connected between the output end of the No.1 LED light and the output end of resistance R3,
The input terminal of diode D3 is connected with the output end of resistance R3, the output end of diode D3 and the output end of No.1 LED light
It is connected.
2. a kind of control circuit for controlling the operation of two LED light using single I/O port as described in claim 1, it is characterised in that:
The central processing unit is internally provided with an enhanced N-channel field-effect tube, and drain electrode and the central processing unit of the field-effect tube
The IO output end of unit is connected, and the grid of the field-effect tube is connected with logic I/O, and the source electrode of the field-effect tube connects public
Ground.
3. a kind of control circuit for controlling the operation of two LED light using single I/O port as described in claim 1, it is characterised in that:
It is also serially connected with resistance R1 and resistance R2 respectively on the connecting line of the No.1 LED light and No. two LED light and supply voltage VDD.
4. a kind of control circuit for being controlled the operation of two LED light using single I/O port as claimed in claim 1 or 3, feature are existed
In: resistance R4 is also connected between the input terminal of the diode D3 and the output end of resistance R3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811170592.6A CN109121255B (en) | 2018-10-09 | 2018-10-09 | Control circuit for controlling operation of two LED lamps by using single IO port |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811170592.6A CN109121255B (en) | 2018-10-09 | 2018-10-09 | Control circuit for controlling operation of two LED lamps by using single IO port |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109121255A true CN109121255A (en) | 2019-01-01 |
| CN109121255B CN109121255B (en) | 2020-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811170592.6A Active CN109121255B (en) | 2018-10-09 | 2018-10-09 | Control circuit for controlling operation of two LED lamps by using single IO port |
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| Country | Link |
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| CN (1) | CN109121255B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110459024A (en) * | 2019-08-08 | 2019-11-15 | 深圳市宏电技术股份有限公司 | A kind of network interface condition indication circuit and system |
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| Publication number | Publication date |
|---|---|
| CN109121255B (en) | 2020-09-01 |
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