Electronic cigarette and method for controlling electronic cigarette emitting light

1. An electronic cigarette, comprising a microcontroller, a light emitting unit and a power supply unit, wherein

the microcontroller is electrically connected to the power supply unit, the light emitting unit is electrically connected to the microcontroller and the power supply unit;

the power supply unit is configured to supply power to the microcontroller and the light emitting unit;

the microcontroller is configured to control the light emitting unit in different light emitting states, so as to indicate the different smoking states of the electronic cigarette;

the different light emitting states of the light emitting unit includes: gradually brightening to a preset first brightness, gradually darkening from the preset first brightness to a preset second brightness and maintaining the second brightness within a preset period of time, and stopping emitting light;

wherein the electronic cigarette further includes a smoke sensor which is electrically connected to the microcontroller and the power supply unit, the smoke sensor is configured to detect smoking signals, and to transmit the smoking signals to the microcontroller;

wherein the light emitting unit includes a light emitting diode;

wherein the microcontroller is configured to receive a first smoking signal, and then control the light emitting diode to brighten gradually until the brightness of the light emitting diode reaches a preset first brightness;

wherein the microcontroller is further configured to determine whether the first smoking signal stops, if stops, then controls the light emitting diode to darken gradually until the brightness of the light emitting diode reaches a preset second brightness;

wherein the microcontroller is further configured to begin to timekeeping when the brightness of the light emitting diode reaches the preset second brightness; if the length of timekeeping is less than or equal to the preset period of time, and the microcontroller receivers a second smoking signal, then the microcontroller controls the light emitting diode to brighten gradually from the second brightness, until the brightness of the light emitting diode reaches the preset first brightness; if the length of timekeeping is more than the preset period of time, and the microcontroller has not received the second smoking signal yet, then the microcontroller controls the light emitting diode to stop emitting light;

wherein a first output port of the microcontroller is connected to a cathode of the light emitting diode through a resistor R 1 ; a second output port of the microcontroller is connected to the cathode of the light emitting diode through a resistor R 2 , and a first input port of the microcontroller is connected to the smoke sensor;

wherein the electronic cigarette further includes: a voltage regulation circuit, a switching circuit and an atomizer;

the voltage regulation circuit is connected to the atomizer, the power supply unit and the microcontroller, and is configured to regulate the voltage of the power supply unit so as to output a constant voltage to the atomizer;

the switching circuit is connected to the atomizer, the power supply unit and the microcontroller; the microcontroller controls the switching circuit turning on or off according to the smoking signal detected by the smoke sensor, further connects or cut off power supplied from the power supply unit to the atomizer;

wherein the voltage regulation circuit includes a MOSFET Q 1 ; and the switching circuit includes a MOSFET Q 2 ;

a first pulse output port of the microcontroller is connected to a gate of the MOSFET Q 1 ; a drain of the MOSFET Q 1 is connected to the atomizer; a source of the MOSFET Q 1 is connected to the power supply unit;

a third output port of the microcontroller is connected to the gate of the MOSFET Q 2 ; the source of the MOSFET Q 2 is grounded and is connected to the power supply unit, and the drain of the MOS transistor Q 2 is connected to the atomizer.

2. The electronic cigarette according to claim 1 , wherein the smoke sensor includes an airflow sensor or a gas sensor.

3. The electronic cigarette according to claim 1 , wherein type of the microcontroller is SN8P2711.

4. The electronic cigarette according to claim 1 , wherein the power supply unit is a storage battery, a dry battery or a lithium battery.

5. A method for controlling an electronic cigarette emitting light, the electronic cigarette includes a light emitting unit, wherein

controlling the light emitting unit in different light emitting states, so as to indicate the different smoking states of the electronic cigarette;

the different light emitting states of light emitting unit includes: gradually brightening to a preset first brightness, gradually darkening from the preset first brightness to a preset second brightness and maintaining the second brightness within a preset period time, and then stopping emitting light;

wherein the light emitting unit includes a light emitting diode;

wherein if a microcontroller receives a first smoking signal, then controlling a light emitting diode to brighten gradually until the brightness of the light emitting diode reaches a preset first brightness, and executing the step S 2 ;

if the first smoking signal stops, then controlling the light emitting diode to darken gradually until the brightness of the light emitting diode reaches a preset second brightness;

when the brightness of the light emitting diode reaches the preset second brightness, beginning timekeeping, if the length of timekeeping is less than or equal to the preset period of time, and receives a second smoking signal, then controlling the light emitting diode to brighten gradually form the second brightness until the brightness of the light emitting diode reaches the preset first brightness; if the length of timekeeping is more than the preset period of time, and has not received the second smoking signal, then controlling the light emitting diode to stop emitting light;

wherein a first output port of the microcontroller is connected to a cathode of the light emitting diode through a resistor R 1 ; a second output port of the microcontroller is connected to the cathode of the light emitting diode through a resistor R 2 , and a first input port of the microcontroller is connected to the smoke sensor;

wherein the electronic cigarette further includes: a voltage regulation circuit, a switching circuit and an atomizer;

the voltage regulation circuit is connected to the atomizer, the power supply unit and the microcontroller, and is configured to regulate the voltage of the power supply unit so as to output a constant voltage to the atomizer;

the switching circuit is connected to the atomizer, the power supply unit and the microcontroller; the microcontroller controls the switching circuit turning on or off according to the smoking signal detected by the smoke sensor, further connects or cut off power supplied from the power supply unit to the atomizer;

wherein the voltage regulation circuit includes a MOSFET Q 1 ; and the switching circuit includes a MOSFET Q 2 ;

a first pulse output port of the microcontroller is connected to a gate of the MOSFET Q 1 ; a drain of the MOSFET Q 1 is connected to the atomizer; a source of the MOSFET Q 1 is connected to the power supply unit;

a third output port of the microcontroller is connected to the gate of the MOSFET Q 2 ; the source of the MOSFET Q 2 is grounded and is connected to the power supply unit, and the drain of the MOS transistor Q 2 is connected to the atomizer.

6. The method for controlling an electronic cigarette emitting light according to claim 5 , wherein the first smoking signal and the second smoking signal are the smoking signals detected and transmitted by the smoke sensor of the electronic cigarette.