Thursday, March 26, 2015

Circuit Multicolor Flashing LED Globe using 555 IC

Robometricschool. - Here is Circuit Multicolor Flashing LED Globe using 555 IC like in figure 1 below. The main component of this circuit is LM555 with output to LD3 and LD2. 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 Schematic

Figure 1. Circuit Multicolor Flashing LED Globe using 555 IC
(Source: electroschematics)


Circuit schematic like in figure 1 above is Circuit 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).

Article source: "Crazy Multicolor Flashing LED Globe!"


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