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frequency and duty cycle using ArduinoArduino has several applications. We may find its application in many different fields and areas. It can be used in measurement field also to measure electrical quantities (like voltage, current, power etc) or physical quantities (like temperature, moisture, light intensity, humidity etc) or electronic component values etc. The given article demonstrates how to measure frequency and duty cycle of pulses using arduino.

Frequency measurement is required in so many different applications. In communication field frequency measurement is at most essential. Duty cycle is also an important parameter to measure because it gives % of pulse width – means ON time of the pulseIn DC motor speed control and servo motor angle control, it is required to measure the width of the pulseAlso, the pulse width is measured to check the symmetry of pulse in some of the application like a digital signal receiver, repeaters etc.

Electricity Anti-theft System Block DiagramElectricity theft is a common problem. Due to electricity theft, not only there are losses to the revenue of the government but over loading and damage to the transformers is an unwanted consequence of the theft as well. 

The project demonstrated here is to show the mechanism of electricity anti-theft system. A pack of parallel connected bulbs is used as load while the programmable circuit operating the supply controlling relay is based on Arduino. The principle used behind detecting overloading is voltage comparison and an additional buzzer circuit is attached to the project to alert electricity theft in the locality. The buzzer mechanism has been added to alert people of electricity theft and demoralize the mischievous elements.

DC Motor speed testing using arduinoIn DC motor speed testing, the PWM is applied to the motor and its duty cycle is varied from min to max. While applying PWM the actual RPM of DC motor is also measured and note down to see how motor speed (RPM) varies as PWM width varies. Along with this, the applied voltage to the motor is also measured to see the motor speed at different applied voltage.

Finally, after noting down all the values, the observation table is prepared for pulse width (duty cycle), applied voltage and motor speed in RPM. This table is used to prepare duty cycle->RPM graph or applied voltage->RPM graph of the motor.