Applescript + 2 Arduino's (How to Alternate Between Port Reads?)

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Arduino

serial-port

Apple

Working on getting applescript (using serial port x) to read data from 2 arduino boards, in order to make changes to spotify and master volume through applescript. Currently the code works to a degree, it will read from one Ardunio (controlling play/pause) for a set duration, then swap to read from the other (controlling master volume) until the script is closed.

Ultimately I am trying to make the script alternate the serial port read between the two boards when an input occurs, then swap back to the other and so forth.

I am very new to this, but feel i'm pretty close to getting this working 100%, so any help would be greatly appreciated. Cheers!

set arduinoPort1 to "/dev/cu.usbserial-DA01LZ5L"
set arduinoPort2 to "/dev/cu.usbserial-DA01LL8E"
set arduino1 to serialport open arduinoPort1 bps rate 9600 data bits 8 parity 0 stop bits 1 handshake 0
if arduino1 is equal to -1 then
display dialog " could not open port (RFID KEEP CONNECT ERROR) "

end if
--port 1 connect and test

set arduino2 to serialport open arduinoPort2 bps rate 9600 data bits 8 parity 0 stop bits 1 handshake 0
if arduino2 is equal to -1 then
display dialog " could not open port (CAP REST CONNECT ERROR) "

--port 2 connect and test
else
repeat 60 times --seconds times

    set x to serialport read arduino1
    if x is equal to "A" then
        tell application "Spotify" to playpause
        delay 1
    end if 
end repeat
repeat
    set z to serialport read arduino2

    if z is equal to "G" then
        set volume output volume 10
        set volume output volume 5
        set volume output volume 0

        delay 0
    end if

    if z is equal to "FG" then
        set volume output volume 20
        set volume output volume 25
        set volume output volume 20
        delay 0
    end if

    if z is equal to "EFG" then
        set volume output volume 30
        set volume output volume 35
        set volume output volume 40
        delay 0
    end if

    if z is equal to "DEFG" then
        set volume output volume 50
        set volume output volume 55
        set volume output volume 60
        delay 0
    end if

    if z is equal to "CDEFG" then
        set volume output volume 70
        set volume output volume 75
        set volume output volume 80
        delay 0
    end if

    if z is equal to "BCDEFG" then
        set volume output volume 90
        set volume output volume 95
        set volume output volume 100
        delay 0


    end if
end repeat 

end if
end
end