Frequency and Duty Cycle Meter
Electronics
Beginner
Arduino Uno
Arduino C++
About this project
FreqBlade is a handheld digital frequency and duty cycle analyzer that measures any digital signal from 1Hz to 100kHz using only a probe wire and Arduino's hardware interrupt. Touch the probe to a PWM motor controller, 555 timer output, Arduino pin, or any digital signal — FreqBlade displays the exact frequency (auto-formatted in Hz or kHz) and duty cycle percentage on a 16×2 LCD. A 5-LED bar graph shows duty cycle visually. A built-in 490Hz 50% test signal on D11 lets you verify the circuit in 10 seconds with just a jumper wire. No oscilloscope needed. This teaches hardware interrupts, micros() timing, and the relationship between frequency, period, and duty cycle — core ECE measurements every student needs.
What you get
- Complete, commented source code
- Full components list with quantities
- Pin-by-pin wiring guide and connection table
- Step-by-step upload and testing guide
- Project report (.docx, IEEE style)
- Presentation slides (.pptx)
