In today's video we will learn to make a sequence of LED.
We will also learn to limit the number of LEDs in use, as in this case they are only five running back and initiates the sequence.
Or I use this case where only the top eight.
A speed change.
Let's see how it's done.
To make the LED sequence will need two integrated.
One is the 555, which we have already been working very often.
And the CD4017, which was the same as used to turn on and off a light bulb with applause.
We will need a source, it can be five or 12 volts, including a 15 volt works.
This means that this circuit can be connected to car or motorbike, or use a square nine-volt battery.
Remember that this will generate pulses in the leg 3, depending on this capacitor and the change is made in this resistance.
That's why I use a potentiometer.
In this case we need to blink fast, then let's use a 10K pot 10MF and condenser.
By varying this potentiometer we will generate this LED is turned on or off faster.
These pulses are going to use as CD4017 integrated clock.
This is a decimal counter, all you have to do is feed him.
Place the leg 8 and 13 ground and 15, which is the RESET initially left it grounded.
Then let's make a variant with it.
Output LED 10 will go in the following order.
Leg 3, 2, 4, 7, 10, 1, 5, 6, 9, 11.
As they enter the clock pulses, the 555 will light the first LED.
This turns off and then turn on the second, it turns off and the third, and so .
It is generating the sequence and returns and starts.
As we did with the circuit of applause, which leave the link here, I can decide how far the sequence arrives.
Depending, if only I have five LED I reschedules the leg 15.
I don't connect to earth, but the PIN connect to where I want to restart the circuit.
So the LED sequence will not go through ten, but will come to me to decide, depending on the connection that makes him the leg 15.
With that I can restrict the number of LEDs in sequence.
Here I have the 555 and CD4017.
Let's start by wiring 555.
It is a bridge between the leg 4 and 8.
After 8 is a positive cable.
Remember that the superior work BUS it as positive and the one below is negative.
So should connect the power.
8 connect to positive.
There is another bridge between the leg 6 and 2.
Leg 7 comes a 1K resistor to positive.
Remember that the color coding is brown, black and red.
Finished in gold or silver.
Positive resistance to the leg 7.
A capacitor exiting the leg 2 and it is grounded.
Here is the capacitor 10MF and hence the leg that goes to the negative is checked.
They must be careful with that.
I connect the leg 2 at 1 and then I will take 1 to negative.
1 to connect the negative.
we have the 10K potentiometer.
Remember that it is always connected between the middle pin and any of the corners.
Connect the potentiometer.
1 through 6, carry a blue cable to connect the 7.
Paw 3 co we leave a 1K resistor and connect the LED to negative.
I'll take that have the negative pin 1 to connect the LED.
We connect the power, positive and negative bottom up.
The LED starts to oscillate.
And with the potentiometer I can vary the oscillation.
Slower or faster.
After having proven we can continue.
After trying that, we continue with the CD4017.
We disconnect the voltage to continue working.
Output pulses leg 3 555, connect it to the CD4017 14.
The 16 connect to the positive.
Now we connect negative leg 8, the 13 and 15 also connect provisionally.
And we connect the 8, the 13 and the 15 provisionally.
The missing 10 LED is connected with 1k resistors, each of the outputs.
We started junction 3.
Here we leave the leg 3 with a 1k resistor and we reached an LED after going to connect to this bus, all negative.
The next leaves the leg 2 and goes to the other LED.
We continue with the LED next leg 4.
In the same way we finished all LED wiring, until the tenth that goes into the leg 11, following this strict order.
Here I finished all LED wiring.
As they realize all come with 1K resistor, they are coming to the LED.
Remember to make the bridge from one side of PROTOBOARD the other negative.
For this BUS me stay any negative and LEDs can operate.
Connect the power supply.
We have the LED sequence.
The first LED indicating pulses denied by 555, acting as a clock for the decimal counter that is carrying the sequence.
If I want to change I move the potentiometer.
We can realize that it is much faster.
Or if you want slower.
If I want to limit the sequence less than 10 LED, I set up the connection leg 15.
The I can take for example the leg 9.
And it makes sequence only until the eighth LED.
And he starts again.
If the way to the 10 returns and I stay in the top four.
If I have for example from 15 to 1, it makes the sequence only for the first five.
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In the next video I'll show you how to connect more LED, 20, 30 and what additional LED circuit to do.
Even how to light bulbs 110 or 220 volts.
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