User manual

Ausgabe 19.05.2017 Copyright by Joy-IT 13
5.3 Project 3: PWM Lightcontrol
PWM, short for Pulse Width Modulaon, is a technique, used to
translate analog signals into digital signals.
A computer is not able to output an analog voltage.
Er kann nur Digitalspannung ausgeben mit Werten wie 0V oder
5V.
Therefore, a high-resoluon counter is used, to code an analog
signal level, by modulang the occupancy rate of PWM.
The voltage and current is led by repeated pulse sequences to the component.
Every analog value can be decoded by PWM, if the bandwith is appropiated.
The value of the outputvoltage is calculated with the duraon of the on and o condions.
Voltage = (ON duraon / pulse duraon) * maximum voltage
PWM has many uses: control of lighntensity, control of motor speed etc.