Arduino code help.

Hi

I'm not sure I have well understood the behavior you want to have but if yoy want to set the LED value to 1 but not have the LED ligth up, just memorize the LED state in variable. When the another button is pressed then apply the led states to the outputs.

Just explain me your project, I will try to help you. I can't understand what you really want  with your explanation.

The idea is to have a project box with about 10 buttons on the project box and little LEDs next to them, wherever the LEDs are placed, there will be pieces of paper indicating what each button represents next to the LEDs . The box would also have 2 buttons on the side of the project box, one would be used to turn on the leds that had their corresponding buttons pushed and the other

would reset the system so it could be used with different combonations.

That is a an easy code to program, you just have to set each push button to set a value "ON" on each correspondent LED.

I don't understand what you want to do with the other two push buttons.

I will not make the code for you since you are here to learn, so write your code and I will be glab to help you with any errors and give you any advise if you need.

byte leds[10];

void reset() {

     for(int led=0; led<10; led++) {

          leds[led] = 0;

          digitalWrite(led, LOW);

     }

}

void set(int led) {

     if(led < 10 && led >= 0) leds[led] = 1;

}

void enableleds() {

     for(int led=0; led<10; led++)

          if(leds[led] ==1) digitalWrite(led, HIGH);

}

when a button is pressed have it call set passing it's led number

when the reset button is pressed have it call the reset function

when the enable button is pressed call the enableleds function

Message was edited by: William Main changed to use digitalWrite (instead of pin which is for a different MCU library)

Just a note that to light 10 LEDs and monitor 12 switches is going to quickly outstrip your number of input/output pins on a basic arduino UNO. I would recommend using a few I2C chips (MCP23017) http://ww1.microchip.com/downloads/en/devicedoc/21952b.pdf. Up to 8 of these can be added to the same 2 wire bus. Each will provide 16 input/output bits. This would allow you 16 X 8 = 128 bits you can connect to for either input (button) or output (led). You can purchase a breakout with one chip from spikenzielabs.com. It is sold as I2C LCD Interface but can be used for any purpose.

See the wire http://arduino.cc/en/Reference/Wire library.

spikenzie labs sell just the mcp23017 chip for $1.89 each http://www.spikenzielabs.com/Catalog/index.php?main_page=product_info&cPath=2_30&products_id=16

If you decide to go with the MCP23017, there is a library for the arduino here https://github.com/adafruit/Adafruit-MCP23017-Arduino-Library

Hi Michael,

You have an interesting project there. Did William Main's code solve your problem or you are still having difficulty?

Faiz Ishaq

I don't really understand the code sadly

I'm not that advanced with arduino programing yet,

Could you possibly help me?

Also

Adding on extra chips seems hard, is there anything you could help me with to clear that up?

You don't have to add any chips for now.

I will write the sequence of things and then you can write the code yourself. I am sure you can write the code to light an LED on the press of a button.

Let us start with a simle example of 4 buttons and 2 leds. The leds are led1 and led2. The buttons are btn1, btn2, btn-go and btn-rst.

Normally, when btn1 is pressed you turn on led1. But here is what you want to do:

- When btn1 is pressed you just mark that led1 will be turned on

- When btn2 is pressed you just mark that led2 will be turned on

- When the btn-go is pressed you turn on all the leds which have been marked to be turned on

- When btn-rst is pressed you turn off all leds and set mark states to off

You will need to define one memory variable to mark the state for each led, let us call them mrk1 and mrk2

Now here is the code you have to write:

to start with:

  mrk1=0

mrk2=0

on btn1 press:

  mrk1=1

on btn2 press:

  mrk2=1

on btn-go press:

  if mrk1=1, light led1

  if mrk2=1, light led2

on btn-rst press:

  turn off led1

  turn off led2

  mrk1=0

  mrk2=0

Hopefully, you can write and understand this code. Once you do it you will understand the other code, too. Just ask for more help if you have any problem.

Thanks so much for the help! I'm currently waiting on some more momentary switches so I won't be able to try out the code for a little while, but thanks for the

help and if I need any more I'll be sure to ask you!