attiny85 UART Fingerprint Sensor

attiny85uart.ino

#include "SoftwareSerial.h";

const int Rx = 3;
const int Tx = 4;
const int rst_rnd = 2;
const int temp = 0;

SoftwareSerial mySerial(Rx, Tx);
const byte txBuf[] = {0xF5, 0x0C, 0x00, 0x00, 0x00, 0x00, 0x0C, 0xF5};
byte reply[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};

void setup() {
  pinMode(1,OUTPUT);
  pinMode(5,OUTPUT);
  digitalWrite(1,LOW);
  digitalWrite(5,LOW);
  
  pinMode(Rx, INPUT);
  pinMode(Tx, OUTPUT);
  pinMode(temp, OUTPUT);
  mySerial.begin(19200);
  while(!mySerial) {
    ;
  }
}

void loop() {
  while(mySerial.available()>0)mySerial.read();
  delay(1000);
  while(mySerial.available()>0)mySerial.read();
  mySerial.write(txBuf, 8);
  for (int i=0; i<8; i++) {
    reply[i] = 0x00;
  }
  delay(1000);
  while(mySerial.available()<8){};
  int i=0;
  byte x;
  while(mySerial.available()>0){
    x = mySerial.read();
    reply[i] = x;
    i++;
  }
  
  if(reply[0]==0xF5 && reply[4]== 0x03 && reply[7]==0xF5){
    while(mySerial.available()>0)mySerial.read();
    digitalWrite(temp, HIGH);
    delay(2000);
    digitalWrite(temp, LOW);
    delay(1000);
  }
  else{
    while(mySerial.available()>0)mySerial.read();
  }
  delay(1000);

}