/*
 * a simpel UART to GPIO converter
 * outputs only
 * example written for Arduino Nano
 */
void setup() {
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  Serial.begin(115200);
}

void loop() {
  uint8_t tmp;
  
  if (Serial.available()) {
    tmp = Serial.read();
    digitalWrite(2, (tmp & 1<<0));
    digitalWrite(3, (tmp & 1<<1));
    digitalWrite(4, (tmp & 1<<2));
    digitalWrite(5, (tmp & 1<<3));
    digitalWrite(6, (tmp & 1<<4));
    digitalWrite(7, (tmp & 1<<5));
    digitalWrite(8, (tmp & 1<<6));
    digitalWrite(9, (tmp & 1<<7));  
  }
}