Thursday, March 5, 2015

Circuit Diagram Crazy Multicolor Flashing LED Globe! using 555 IC

Robometricschool. - Here is Circuit Diagram Crazy Multicolor Flashing LED Globe! using 555 IC like in figure 1 below. Nowadays, single-color and multi-color flashing LEDs are easily available, which obviates the requirement of external chips to produce fascinating lighting effects. What can we do with one piece of such a single color flashing LED, and two pieces of multicolor flashing LEDs? Here is an ultrasimple circuit of an LED Globe wired around the evergreen timer chip IC 555. One advantage of this LED Globe is that it is a voltage-controllable flashing device, ready to work together with any microcontroller chip. This allows you to control the light pattern to a certain extent in tune with the output signal from an external microcontroller, too!

Circuit Diagram

Figure 1. Circuit Diagram Crazy Multicolor Flashing LED Globe! using 555 IC
(Source: www.electroschematics.com)
Description

Circuit diagram like in figure 1 above is Circuit Diagram Crazy Multicolor Flashing LED Globe! using 555 IC. Nothing new, here the 555IC (IC1-LM555) is wired as a monostable multivibrator (MMV) working on regulated DC5V supply. RC components R2(1K) and C2 (100uF) sets the monotime period. At the front end of the circuit, one single-color flashing LED (LED1-5mm Red) is connected across the power rail through a current limiting resistor (R1-1K). The pulse output available from this LED is directly fed to the trigger input (pin 2) of the 555 IC

The control voltage is driven to the control voltage terminal (pin 5) of IC1 through a resistor (R4-1K). For normal use, the control voltage can be generated from a 10K multi-turn potentiometer (P1-10K) as shown in the circuit diagram. Actually, any kind of DC voltage level generator can be used to control this circuit. It could come from a photoresistor voltage divider, sound to voltage converter,from a microcontroller,etc etc. The IC1 output (from pin 3) is then extended to two 5mm multi-color flashing LEDs (LED2&LED3) through a single current limiting resistor (R3-47R).

Read more about Circuit Diagram Crazy Multicolor Flashing LED Globe! using 555 IC from the original article here.


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