We are building here a RGB bulb using Red, Green and Blue LEDs, we just need to add a mechanism to control the brightness or intensity of these light individually. To control the brightness, we are using PWM (Pulse width Modulation) method with 555 time IC. 555 timer IC can generate a pulse of variable width, and width of Pulse can control the Duty cycle. Duty cycle is nothing but the Ratio of High time to the total time.
Duty Cycle %= Turn ON time/ (Turn ON time + Turn OFF time) *100
Check out the demonstration video here:
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