Binary coded decimal output controlled by a serial command

i have project in mind requires 4 bit bcd output select integer between 1-15. plan use pins d2-d5 , toggle them on/off needed output need device.

the planned usage had in mind send serial command raspberry pi argument desired integer, example if wanted select integer 1, send "1" argument, , send pin d2 high. using arduino nano plugged in via usb.

i wasn't real sure if feasible or begin, i've started looking @ , able basic comm code:

code: [select]


int serialdata = 0;

void setup()
{
  serial.begin(9600); 
}

void loop()
{
  if (serial.available() > 0)
  {
    serialdata = serial.read();
    serial.println(serialdata);
  } 
}


if open serial monitor , send "1" echoes in ascii (49). i'm not real sure on go here or efficient way toggle pins needed depending on number sent.

you lost me this:

quote

the planned usage had in mind send serial command raspberry pi argument desired integer, example if wanted select integer 1, send "1" argument, , send pin d2 high. using arduino nano plugged in via usb

if nano plugged rpi usb port, serial come , go to? how block diagram showing pieces, interconnects , distance between them?

thinking second or 2 says output 4 bits directly rpi's gpio. why bother nano , comms?

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