/*
This sketch runs on an Arduino connected to an ATtiny85 running w13_tiny_slave.ino
The data received is from a HC-SR04 sensor
 */

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);

byte distance;                              // Where the Distance is stored (8 bit unsigned)


void setup()
{
  Wire.begin();
  Serial.begin(9600);
//  Serial.println("Setup");

    /* LCD 16x2 */
  lcd.init();
  lcd.backlight();
  lcd.clear();
}



void loop()
{
  Wire.requestFrom(7, 1);                  // The TinyWire library only allows for one byte to be requested at a time
  while (Wire.available() == 0)  ;         // Wait until there is data in the I2C buffer

  distance = Wire.read();                  // Read the first (and hopefully only) byte in the I2C buffer
//  Serial.println(distance);

  lcd.setCursor(0,0);
  lcd.print("                "); // erase line
  lcd.setCursor(0,0);
  lcd.print("Distance:");
  lcd.print(distance,1);
  lcd.print("cm");
  delay(300);                   // The sensor only updates every 30 ms. Asking for new data quicker than that is useless
}