Timers & PWMPeriod and duty cycle as counter values, and the arithmetic that connects them to hertz.Electrical EngineeringA timer counts clock ticks, so both period and dutycycle are simply counter values.f_pwm = f_clk / (prescaler × (period + 1))72 MHz, prescale 721 MHz tick1 μs per count.Period 9991 kHz output1000 ticks.Compare at 25025% duty cycle250 of 1000.THE COMMON MISTAKE✗ Making a waveform with delays in software✓ Letting the timer generate it in hardwareThe timer keeps running while the CPU does other work. Software timing jitterswith every interrupt that lands mid-pulse.Frequency and resolution trade directly: a faster PWM leaves fewercounts per period, so fewer distinct duty levels.Timers & PWMlearnposters.com
Timers & PWM — printable engineering wall chart from LearnPosters. Free vector PDF, US Letter and A4.

What’s on the Timers & PWM poster

The rule, 3 worked examples, and the mistake everyone makes.

Frequency and resolution trade directly: a faster PWM leaves fewer counts per period, so fewer distinct duty levels.

Questions about the Timers & PWM poster

What’s on the Timers & PWM poster?
The rule, 3 worked examples, and the mistake everyone makes. A timer counts clock ticks, so both period and duty cycle are simply counter values.; f_pwm = f_clk / (prescaler × (period + 1)); 72 MHz, prescale 72 = 1 MHz tick; Period 999 = 1 kHz output; Compare at 250 = 25% duty cycle; Common mistake: Making a waveform with delays in software → Letting the timer generat…. Frequency and resolution trade directly: a faster PWM leaves fewer counts per period, so fewer distinct duty levels.
Who is the Timers & PWM poster for?
Timers & PWM belongs to the Electrical Engineering section rather than to a school year, because engineering is not something one grade owns. Anyone learning embedded systems can pin it up — a beginner, a student mid-course, or someone revising years later.
When should you use the Timers & PWM poster?
Use it to set up a PWM output for a motor, an LED dimmer or a servo signal. A wall chart earns its place by being glanceable from where the work is happening, so Timers & PWM belongs on the wall where that engineering work actually happens, within glancing distance, rather than filed away.
What other posters go with Timers & PWM?
ADC Resolution, Driving Loads and GPIO & Pull Resistors sit alongside Timers & PWM in the Electrical Engineering section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.ADC ResolutionDriving LoadsGPIO & Pull Resistors
Is the Timers & PWM poster free to download and print?
Yes. Timers & PWM downloads as a free PDF with no account, no email and no watermark, like everything else in the Electrical Engineering section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
What size does the Timers & PWM poster print at?
Timers & PWM is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of Timers & PWM loses nothing.Printing guide

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