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PWM has also been used in certain communication systems where its duty cycle has been used to convey information over a communications channel. We can "manually" implement PWM on any pin by repeatedly turning the pin on and off for the desired duty cycle. Pulse Width Modulation (PWM) is a technique widely used in modern switching circuit to control the amount of power given to the electrical device.  This method simply switches ON and OFF the power supplied to the electrical device rapidly.
The 100% PWM duty cycle means it’s fully ON and we could say that 100% of the power or energy is delivered to the electrical device, while 15% duty cycle means only 15% of the power is being delivered to the electrical device. The PWM signal normally has a fixed frequency (period) with a duty cycle that could vary from 0% to 100%. Most of the microcontroller PWM peripheral depends on the TIMER peripheral to provide the PWM signals frequency. Each of the AVR ATMega168 microcontrollers TIMER has two PWM channels named channel A and channel B, where each channel has its own output compare register (OCR). The AVR fast PWM mode could generate the most high frequency PWM waveform compared to the other two PWM modes (i.e. On this following C code, we are going to use TIMER0 Fast PWM mode on both channel A and channel B.
You could freely choose or experiment with any PWM frequency that work best with the electrical devices that you want to control with the Fast PWM mode signal.
One of disadvantage using the Fast PWM mode to generate the PWM signal is the PWM phase is shifted when we change the PWM duty cycle.
This make the Fast PWM mode is not suitable when we want to use for controlling the motor speed precisely; therefore on our next discussion we will correct this shifted phase effect by using the AVR microcontroller Phase Correct PWM mode for generating the PWM signal. Now as you understand of how to use the Fast PWM mode on TIMER0, you could easily adapt this principal to TIMER1 (16-bit) and TIMER2 (8-bit). Differ from the Fast PWM Mode, the Phase Correct PWM mode is using dual slope TIMER counter. As shown on the diagram above you could see that the Phase Correct PWM mode will have half of the PWM signal frequency compared to the fast PWM mode. On this following C code, we are going to use TIMER0 Phase Correct PWM mode on both channel A and channel B.
Differ from the Phase Correct PWM Mode, in Phase and Frequency Correct PWM Mode the Output Compare Register (OCRnA and OCRnB) is updated from the buffer when the Timer Counter Register (TCNTn) reaches BOTTOM instead of TOP in Phase Correct PWM Mode.
In Phase and Frequency Correct PWM mode because the Output Compare Register is updated at the BOTTON therefore the rising and falling length of the PWM signal is always equal this result in frequency being corrected when we change the frequency on fly. Typically in controlling the electrical device with PWM signal we seldom change the PWM frequency on fly, therefore the common application for this mode is to generate the sound.

This RGB light and Sound show project used the well known LM386 linear amplifier IC from National Semiconductor which recently has been acquired by Texas Instrument (April 2011) to produce a quite loud sound from the TIMER1 Phase and Correct Frequency PWM mode through the speaker. To make the low pass filter (LPF) become a good integrator circuit we have to choose the LPF cutoff frequency much less than the lowest frequency produced by the PWM signal but at the same time still produce an adequate signal level to drive the LM386 amplifier input. Each of the RGB LED cathodes is driven by TIMER0 Fast PWM channel A, channel B, and TIMER2 Phase Correct PWM channel B respectively. Knowing the basic working principal of the Atmel AVR microcontroller PWM peripheral is one of knowledge that should be learned by anyone who want to involve in the embedded world professionally or just as a hobbyists.
For example, I have ATMEGA8 which has three PWM channel, but I need 4 channel PWM on my project.
I have a question for you, would you please to answer me :-): How to precisely control servo motor (Futaba S3003) rotation using trimport (varistor)!
I didn't have the crystal in the diagram, so I have tried both without the crystal and using a 2Mhz xtal, both with the same result.
Since you used different crystal frequency, you need to adjust the code to suite the crystal frequency for the generated PWM. Controlling the Motor is one of interesting topics in the embedded world especially for the robotics enthusiasts, on the next post we will learn the basic of motor electronic circuit as well as how to control it with microcontroller. If you ever thought of experimenting with pulse-width modulation, this circuit should get you started nicely. Specializing in MATLAB, C++, Arduino, OpenCV, NI Labview, Web Designing & other Electronics stuffs!
Now you understand that by just adjusting the PWM duty cycle we could easily control the LED brightness or the electrical motor spinning speed. Basically the TIMER counter register (TCNTn) will increase its value (up counter) from BOTTOM to TOP and then decrease its value (down counter) from TOP to BOTTOM. Basically the Phase and Frequency Correct PWM mode use the same dual slope technique used in Phase Correct PWM mode to generate the PWM signal.
The frequency could be change by changing the TOP value, here you could understand why we need to use the Phase and Frequency Correct PWM mode, because as we change the frequency and at the same time the PWM peripheral update the Output Compare register (OCRnA and OCRnB) then there will be a glitch in the PWM frequency signal.
On this following C code example I used the Phase and Frequency Correct PWM to generated tone. We use similar principal to both OCR1H and OCR1L for the PWM duty cycle value (duty_cycle).
With this method we could get the desired RGB LED light effect which is depend on the song notes. I hope this basic AVR PWM tutorial will give you a solid AVR PWM knowledge to be used in your next embedded project.

I searched the datasheet and the AVR Studio help file, but it seems like AVR Studio parameters are different than what is shown in the data sheet. You can use them to dim LEDs, control the speed of fans and motors, control the power going to a thermoelectric cooler, or control the power going to pretty much anything you want.
We’ve kept simplicity in mind and used a dual 555 timer, making the circuit a piece of cake. There is no need to explain its operation here, since this can easily be found on the Internet in the datasheet and application notes. The 555 is going the be driven by batteries but the motor is going to be driven by a bank of capacitors so compensation for their voltage degeneration is needed, I have designed another circuit to switch the capacitors over to battery power once they reach a critical voltage.
This PWM mode simply uses the TIMER counter register (TCNTn, where n represent the TIMER 0, TIMER1, and TIMER2 respectively) incremental value which is start from 0x00 (BOTTOM) to 0xFF (8-bit TOP) or 0xFFFF (16-bit TOP). When the TIMER counter register (TCNTn) equal to Output Compare Register (OCRnA or OCRnB) it will generate the Output Compare interrupt and when the TCNTn register reach TOP it will generate the TIMER overflow interrupt (TOV). These two modes actually are identical if we never change the PWM signal frequency, but if we need to change the PWM signal frequency on fly, then we need to use the AVR ATMega168 microcontroller Phase and Frequency Correct mode to generate the PWM signal. The complete C code is implemented in PlayNotes() function, which accept the frequency and duration parameters to produce the needed sound. The Light Emitting Diode (LED) will respond to this pulse by dimming or brighten its light while the electrical motor will respond to this pulse by turning its rotor slow or fast. Thus by converting this PWM signal period to the degree of movement we could easily map the analog trimpot value (used the ADC peripheral) to the servo movement (e.g.
This certainly isn’t an original circuit, and is here mainly as an addition to the ‘Dimmer with MOSFET’ article elsewhere in this website. The second timer works as a monostable multivibrator and is triggered by the differentiator constructed using R3 and C3.
The pulse-width of the monostable timer is given by 1.1xR4xC4 and in this case equals just over a millisecond.
A frequency of 500 Hz was chosen, splitting each half-period of the dimmer into five (a low frequency generates less interference). This changes the voltage to the internal comparators of the timer and hence varies the time required to charge up C4.
With the opto-coupler of the dimmer as load, the maximum current consumption of the circuit is about 30 mA.

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