# COMMUNITY : FORUMS : BURNING QUESTIONS

## How to make: LED circuit that can be switched on and off sequentially using an input button

Dear Instructables Community,

I am trying to create the following LED circuit for a school project and would be grateful for any help.

I would like to create a circuit containing a grid (see attached image) with 2 rows of LEDs in 3 columns. In this circuit, pressing an input button must move the "LIGHT ON" signal from 1 LED to the very next LED on the circuit in the following manner:

Button click -> RowA column1 "ON" (Rest OFF)- > button click -> RowA column2 "ON" (Rest OFF) -> button click -> RowA column3 "ON" (Rest OFF)-> button click -> rowB column1 "ON" (Rest OFF) -> etc etc eventually leading to RowB Column3 "ON" (Rest OFF) -> button click -> rowA column1 "ON" (Rest OFF) -> etc etc

1) What would be the simplest circuit design for such a circuit?

2) How difficult would it be to add a second input that moves the "light on" down a column? (The circuit would then have 2 inputs: 1 button to move "light on" down a row, and the other input to move "light on" down a column.

Thank you :-)

iceng2 years ago

Goes Q2==>Q3==>Q4==>Q5==>Q6==>Q7==>Q1==>Q2= = =

Put the sequential LEDs wherever it suits you.

-max-2 years ago

An arduino and lots of IF-ELSE statements will be the easiest way to do something like that. That would be a good beginners project. Discrete logic can also be used, like a bunch of AND, OR, NAND, NOR, XOR, XNOR, and some latches / flip-flops. That would probably be a bit more challenging though, not impossible though.

Downunder35m2 years ago

I could think of a simple binary counter.

Each button press increases the number by one.

The output is shown on the LED's.

You can get the general ide behind from these links:

http://www.doctronics.co.uk/4017.htm

http://www.eleccircuit.com/7-stage-binary-counter-...

Of course it can be done with an Arduino as well, but I think doing it "basic" style is cheaper.

b1tbyte (author) 2 years ago

Anybody?