In the wonderful world of LED lighting there are many techniques and configurations that can be used to provide and control the delivery of light. LED lighting are suitable for applications needing high efficiency. Some light products apply LEDs are lightweight battery powered device like flashlights, camping lamps, bike lights and others. LED lights do not need to be battery powered various other good applications include LED light bulbs, USB lights, Night time Lights, Accent Lights and power fail safety lamps.
All the for described lights can use a technique called PWM control. PWM stands for Heartbeat Width Modulation and is a technique that switches electricity off and on quickly. By changing the ON time compared to the OFF time you can control how much power is shipped to a device. This control way typically uses a microcontroller to monitor and control the energy output to an LED. A microcontoller is a single chip computer that can be set by an engineer to perform various functions. A typical PWM controller would use one micro control mechanism, a power switching device called a P-channel mosfet, a resistor and a LED to create light. Another item needed is a power supply. Many LEDs need to power by a DC electricity source like batteries or an AC-DC converter. 1 common AC-DC converter is the power adapter used to charge cell cell phones, MP3 players and game playing devices. These converters usually offer an USB dock that gives a 5 volt DC output with up to 2 amplifiers of current.
Using a plug in USB wall membrane converter as the electricity device to provide electricity to the microcontroller and also the LED can make a high efficiency current converter for led lighting. The micro attaches to the control door of the mosfet change and the LED is linked between the ability source, the mosfets current path and a resistor. Each component in the machine has a function. The micro will switch the mosfet very quickly handling the delivery of electricity to the LED. The resistor limits current to the LED so it does not overheat. When ever a micro using PULSE WIDTH MODULATION has been programmed to drive the LED off and on it is desirable to experience a way to monitor an input that will allow the user to modify the Pulse Width the micro outputs to the mosfet switch. This type can be as simple as a push button switch, a thumb tyre switch or other device that the micro can read. Then by press said switch 1, 2, 3 or more times you can improve the Promptly the micro switches thus controller the light level output by the LED.