/* The code sourced from FunDuino from below link 
 http://funduino.blogspot.com/2012/02/attiny45-software-serial.html
                
-----------------------------------
                
     modified by Darshan Shah,
     during Fab Academy 2018.
                
    - Mic pin has been modified. */
                
#include <SoftwareSerial.h>  // include serial library
                
#define rxPin 0 // the pin on which to receive serial data
                
#define txPin 1 // the pin on which to transmit serial data
                
const int analogInPin = 3;  // Analog input pin that the mic is attached to
                
int sensorValue = 0;        // variable to store the value coming from the mic sensor
int outputValue = 0;        // variable to store the output value to the PWM (analog out)
                
SoftwareSerial serial(rxPin, txPin);  // serial communication
                
void setup()  {  // the setup routine once we start
                
  pinMode(rxPin, INPUT_PULLUP); //sets the rxPin as input
  pinMode(txPin, OUTPUT); //sets the txPin as output
                
  serial.begin(115200); // to initialize the communication at 115200 bits per second
}
void loop() { // the loop routine runs over and over again forever
                
  sensorValue = analogRead(analogInPin);  // reads the value from the specified pin        
                
  outputValue = map(sensorValue, 0, 1023, 0, 255); // maps the value between the specified range       
                
 // the following commands prints the value on the serial monitor or the serial plotter                
                
  serial.print("sensor = " );  // print out the text as it is                   
  serial.print(sensorValue);  // print out the sensor value you read   
                
  serial.print("\t output = ");  // print out the text as it is   
  serial.println(outputValue); // print out the output value you read
                
  delay(100); // delay at 100 miliseconds in between reads for stability  
}