5 More Breadboard Projects For Beginners: Project 2- Alternate Flashing LED Lights | DIY

Complete article with details: www.instructabl...
BreadBoard Layout: cdn.instructab...
Schematic: cdn.instructab...
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'How to' video on Project 2- Alternate Flashing LED Lights. Version 2 of the BreadBoard Projects For Beginners Series (with 5 projects).
Link to Version 1 (with 10 projects): www.instructables.com/id/Ten-Breadboard-Projects-For-Beginners/
Other 4 projects are:
#1 Firefly
#3 MultiColor LED Lights (w/ an RGB LED)
#4 Traffic Lights
#5 Fastest Finger First (Game)
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The next project describes two LEDs that flash alternately over a fixed interval of time. So again we're using a 555 timer IC here, in astable mode. The resistor/capacitor values are such that the output on pin 3 switches between low to high. You may see in the schematic that the positive terminal of one of the LEDs is connected to pin 3 via a resistor while the negative terminal of the second LED is also connected to the same pin. Thus, when the output is 1 (High), LED 1 glows and when the output is 0 (Low), LED 2 glows. The cycle continues.
Connect all the components as per the layout. At last, connect a power supply and check if it works. You have to be very accurate with the connections. Try changing the value of the 47K resistor to random. Decreasing the value would increase the flashing speed.
Difficulty: Easy
Parts Used:
1x NE555 IC
1x 10uF Capacitor
2x LEDs (any color)
2x 100 ohm Resistors
1x 47K Resistor
Circuit Source: www.learningabo...
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Thanks for watching! :)

[@bobertbobert6442]

I love the simplicity! Bought the components. Question.... why is the breadboard picture laid out different than the actual video?

[@jerkitz98]

Why do you have the negative terminal of the capacitor connected to positive

[@MuhammadImran-yq1qn]

Thanks a lot.

[@bobertbobert6442]

How can I change the flash rate? Where to install a potentiometer?

[@ashirmalik2310]

omg thanks!

[@bobertbobert6442]

What is the voltage input? 9v okay?

[@breadboardio-breadboardpro4155]

And what happened if I use bicolor LED?

[@SaiyamAgrawal]

I guess that is not possible in this circuit because a bicolor LED has a common cathode or common anode.. but here one of the LEDs are connected to Vcc and other to Gnd. However, bicolor LED can work with certain modifications in the circuit. Have a look at this: www.555-timer-circuits.com/driving-a-bi-coloured-led.html

[@breadboardio-breadboardpro4155]

Saiyam Agrawal Thanks!

[@jameshills115]

As effortless to implement as any non-colour corrected H4 automotive globe goo.gl/gEsmhl (make certain you wear cotton gloves and don't touch the quartz globe or even the oils in the skin will ruin light output) 90 Watts low beam (compared to the usual 55 Watt) 100 Watts high beam (contrary to 60 Watt typical) give significantly whiter, lighter light.