Arduino as a Switch

Using Arduino Programming Questions
1

I'd like to use pins as switches.
Like connect pin 4 to 5 so that current can flow from 4 to 5 or from 4 to a specific collector pin like 12, then all other pins could be switched to that.

Here's what I want to use it for:
I have a radio doorbell which has 6 pins on the back both the sender and the receiver. They change the frequency. You have to pull the same pins out on both of them so they stay on the same frequency.
Now I want to brute force it so that it plays through every single possibility but not lighting up LED-s but connecting these pins in the sender.
I have the code working for the LED-s, now I'd like to use those pins as switches.

I can't explain it any better.

2

The 'pins' probably either connect a HIGH signal (pull-up resistor) to Ground or a LOW signal (pull-down resistor) to HIGH.

What voltage does the remote run on?

Can you provide a close-up picture of both sides of the circuit board of the device you want to control?

3

Or even get a name/model # to see if there's doc for it on the web?

4

In a few hours I can provide pictures but currently I'm not at home :confused:

5

Here are the pics :slight_smile:
Those little black pieces are the ones that can be removed.

DSC05184_2.jpg
DSC05184_2.jpg3648×2736 728 KB

DSC05185_2.jpg
DSC05185_2.jpg3648×2736 739 KB

6

It appears to me from the schematic that the jumpers pull the lines to Ground. In that case the voltage doesn't really matter and al you need is a digital pin that you set to OUTPUT, LOW to simulate a jumper and INPUT to simulate a removed jumper.

//  Step through every combination of pins 2 through 9
for (i=0; i<256; i++)
    {
    for (pin = 0; pin < 8; pin++)
        if (i & 1 << pin)
            {
            //  Jumper Absent
            pinMode(2+pin, INPUT);
            digitalWrite(2+pin, LOW);
            }
        else
            {
            //  Jumper Present
            pinMode(2+pin, OUTPUT);
            digitalWrite(2+pin, LOW);
            }

    //  Now that the 8 pins are set you can simulate a button press.
    }