LED Button push light up

It sounds like you could just connect a 22 bit Johnson counter to 21 lights with a debounced button to count up. Three CD4017 chips (~$0.11 each) cascaded would could make a 21 bit Johnson counter. You would need a MOSFET on each output to drive each light.

Would this work out to light the leds?

Looks okay except the 555 as a switch debouncer needs a tweak. 

Hi Joseph,

No, this circuit will not work.

Please read the datasheet of the 4017 as well for the 555.

Tip:

1.) the pin 13 (clock enable) of the 3. 4017 is connected to GND together with the input pins of the 555 timer. This ist wrong - just the pin 13 must be connected to GND. -> or -> the pin 4 (/reset (low active)) of the 555 is open. It must be connected to plus. Reseting the timer is not needing here (if you thought this because you wired the pin 13 back to the timer).

2.) the 555 timer is not needing because the clock input (pin 14) of the 4017 has a Schmitt-trigger-Input. A push-button with a R-C combination for debouncing is enough.

3.) the pin 3 of the first 4017 is the "state 0" so if you have here a LED then this LED will light after reset the 4017. So then you have no "switch all LEDs off" state. Here this LED must not be connected to Pin 3. Do you want the the first LED does light after power-on-reset?

In your circuit the LED-"off" state you have it on the 10. state (pin 3 of the second 4017). Is this what you want? If yes, then you are right with the LED on pin 3 of the first 4017.

Gerald

What tweak would i need to do to it?

Is there any advice or schematic change you can suggest to make this work for me?  I really thought i had it.

Hi,

here a suggestion:

As I saw you have drawn it from the example from the datasheet.

Now this is the complete circuit including the bypass capacitors and one of a possible method to make the clock.

The devices are in CMOS, so the AND gates are from the 4081.

Mixing TTL with CMOS is not so good - 1. the supply voltage, 2. power consumption, 3. logic levels...

The bypass capacitors C1 to C5 are in ceramic 50V with 2.5mm grid. C6 is an electrolyte polarized  capacitor, axial 2.5mm grid, 3mm dia, ca. 7mm high.

Edit:

the PCB: X 100mm, Y 50mm

with polygon GND on bottom side.

You can make a single side board, the red wires are then wire-bridges.

Good luck!

Gerald

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Hi,

here a suggestion:

As I saw you have drawn it from the example from the datasheet.

Now this is the complete circuit including the bypass capacitors and one of a possible method to make the clock.

The devices are in CMOS, so the AND gates are from the 4081.

Mixing TTL with CMOS is not so good - 1. the supply voltage, 2. power consumption, 3. logic levels...

The bypass capacitors C1 to C5 are in ceramic 50V with 2.5mm grid. C6 is an electrolyte polarized  capacitor, axial 2.5mm grid, 3mm dia, ca. 7mm high.

Edit:

the PCB: X 100mm, Y 50mm

with polygon GND on bottom side.

You can make a single side board, the red wires are then wire-bridges.

Good luck!

Gerald

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