I want to make an LED blinking circuit. when I push a button led should blink for 5 seconds and then off. i want to make it as simple as it can be.

 

As simple as possible? Use an MCU.

 

As simple as possible? Use an MCU.

no. i want to make it by using a single ic
it should be single ic led's and cells

 

An MCU is a single IC. The only additional parts required are two resistors, switch, and LED.

 

wh

An MCU is a single IC. The only additional parts required are two resistors, switch, and LED.

which MCu should I use?

 

How many leds?
What is the Vcc for the circuit?

 

A single 556 is a non-programing alternative to a micro.

Not as simple as a micro, but still pretty simple.

 

it should be single ic led's and cells

You're going to need a bit more than that.

A 556 dual timer, about a dozen or so resistors, about half a dozen capacitors, a switch, a power source, and your LED.

A microcontroller could do it with fewer components, buy you need to be able to program the microcontroller (write the program and load it onto the microcontroller).

 

"A dozen or so resistors"

Really, minus the LED dropping resistor I count 4.

 

Actually, with an MCU, you only need one resistor for the LED.
(You could eliminate the resistor if you output PWM but I wouldn’t recommend it.

Which MCU?
I would be looking at an 8-pin IC from Atmel AVR series or Microchip PIC series.

 

Single 555 , 3 resistors and 2 capacitors.

 

Single 555 , 3 resistors and 2 capacitors.

You're the winner.
Let's see it.

 

One capacitor to reset the 555 after 5 seconds.

 

Seems like a certain amount of bluffing here.
I call.
Let's see the cards.

 

You're the winner.
Let's see it.

At dinner right now but imagine a 555 astable using 1 cap and 1 resistor. Another cap and resistor from pin 4 to ground. A momentary switch from pin4 to Vcc and a resistor for the LED.

 

There are two things you want. Blink and 5 seconds.
There are some LEDs that blink all the time. Now you only need a 5 second timer.

 

There are two things you want. Blink and 5 seconds.
There are some LEDs that blink all the time. Now you only need a 5 second timer.

The proposal is to put a 5-second RC circuit on the 555-timer reset.

 

At dinner right now but imagine a 555 astable using 1 cap and 1 resistor. Another cap and resistor from pin 4 to ground. A momentary switch from pin4 to Vcc and a resistor for the LED.

I thought of that.
The minimum reset voltage is 0.4V and the maximum reset current is 0.4mA, so the minimum resistor value is 1kΩ, so since it takes about 2.4 time-constant to drop to 0.4V from a 5V supply, the capacitor value would be a large 2mF for a 5 second on-time.
Given the sensitivity of that circuit to the small reset voltage and the time-constant, getting a reasonably stable 5 second period would seem to be problematic.

A 556 circuit may be best for minimum parts.

Below is the LTspice sim of a circuit using one CD4093 quad Schmidt-trigger NAND gate chip and one small MOSFET LED driver:
R3 and D2 are to avoid the otherwise long first pulse width.
The input latch insures that the last pulse is not truncated.
The normal first and last pulse-widths are not critical to have, but they are a nice feature of the circuit, which the 555 circuits may not have.

You can eliminate the MOSFET and drive the LED with the U1 output directly if a high brightness LED operating at a few mA gives sufficient brightness.

 

My circuit would use a cmos 555 with a 100K resistor on pin4.

 

I think the above post #18 is really a great way to resolve this application as it demonstrates a good use of the logic parts.

But it all depends on what you regard as "Simple".
This to my mind is simple...


But the complexity is in the writing of the program and the programmer hardware required.

This question reminds me of one a couple of years ago when a poster wanted to make a "Simple Video Camera" from the ground up.
Purchasing a pre-made board, like with the ESP32CAM is simple, but to build a camera from logic and analog parts is not. (I had done just that in the past and it did not work very well).