Convert Character to Binary and output to 8 pins

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4

That is the idea, but you do not need the pos +=1, set the for loop indexer to n < 7; and use the for loop indexer (n) in the bitRead function (see below).

Here is a demo that reads a character from the serial port and sends the ASCII character code out to an array of 8 pins.

// serial input basics Example 1 - Receiving single characters
// https://forum.arduino.cc/t/serial-input-basics-updated/382007
// set serial monitor baud rate to 115200 and line endings to "no line ending"

const byte pins[] = {2, 3, 4, 5, 6, 7, 8, 9};

char receivedChar;
boolean newData = false;

void setup()
{
   Serial.begin(115200);
   Serial.println("<Arduino is ready>");
   for (int n = 0; n < 7; n++)
   {
      pinMode(pins[n], OUTPUT);
   }
}

void loop()
{
   recvOneChar();

   if (newData == true)
   {
      for (int n = 0; n < 7; n++)
      {
         digitalWrite(pins[n], bitRead(receivedChar, n));
      }
      newData == false;
   }
}

void recvOneChar()
{
   if (Serial.available() > 0)
   {
      receivedChar = Serial.read();
      Serial.println(receivedChar, BIN);
      newData = true;
   }
}