LED Circuit

[TED_E]

I want to build a 4 LED circuit where the LED's light up 1,2,3,4 but each one stays lit until #4 then it starts over. Will this circuit do it?

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[BrownOut]

Use seperate series resistors for each LED. Connect Pin 10 to Pin 15. R3 serves no apparent purpose. Connect pin 6 of your 555 to the same point as Pin2.

 

[BrownOut]

OH, and connect Pin 6 to Pin 14, and Pin 1 to Pin 9.

 

[BrownOut]

One more thing, there should be a connection at the point where Pin 2 of the 555 crossed the wire that connectes from the variable resistor to the capacitor.

 

[TED_E]

Okay thanks, but if I do it this way will the 4th LED light or do I need to put the reset on the first bit of the second register?

**broken link removed**

 

[BrownOut]

NO, leave the reset connected as before. I said connect Pin 10 to Pin 15. That carries over the last register of SRA to the first register of SRB. You should read my comments very carefully.

Also, when I said 1 resister for each LED, I meant you should have one and only one. For your 2nd schematic, you should get rid of R4.

 

[TED_E]

Okay, got it. How's this?

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[BrownOut]

Much better.

 

[Hero999]

Also, please post your pictures using the attachment system rather than linking external images.

 

[ldlaughlin]

This is exactly the type of project I have been looking for. I need it for a project I have been working with, I will try this out.