Arduino to send pulse for Scoreboard Circuit

Projects General Guidance
1

I'm trying to connect my scoreboard to my arduino uno. The arduino is supposed to send a pulse(or whatever it was called) to the scoreboard each time a correct button is pressed. But when I connect it to the arduino, the scoreboard increments on itself without me doing anything. Here is the circuit I got from the internet. What I did is replace the 555 circuit and replaced a pin from the arduino to the pin 5 of the 74ls192 which is like the trigger pin of the scoreboard. I also tried connecting the scoreboard circuit to the arduino ground and yet, it still increments on its own. What could be the problem?

2

1- Do you have ANY electronics experience (whatsoever) ?
2- Did you read ANY datasheets ?
3- Can you describe YOUR circuit (the one YOU posted) ? (circuit operation, configuration and function of each IC , etc etc etc ) ?

ie: What is the Truth Table for the operation of ic2 ?

3

Draw a schematic of the circuit you have now or list the connections and take a photo of it and post it. (74ls192 part only)

4

Please do not double post as it wastes time.

5

Hi, did you remove R4 the 560R resistor that is on the input you have connected the arduino to?
You will need to connect gnd of the arduino to the gnd of the score circuit so that pin 5 will see a change in state.
Also you will have some digital level problems with the arduino on 5V and your scorer on 9V.
Supply the scorer with 5V as well and the levels should work.

Tom.... :slight_smile:

6

read how to post code, then post your code.

pins 4 and 5 have pull-ups. is your sketch keeping the outputs low ?

looks like the arduino needs to bring the line low to toggle and keeps it high to do nothing.

7

Low to High transition pn CP increments count.