SoftwareSerial

Projects Programming
3

The "Wire" library doesn't work with a 'tiny85, (no hardware I2C, only a Universal Serial Interface). You'll need an alternative library, perhaps "TinyWireM".

Regarding "SoftwareSerial", this compiles fine for me with a 'tiny85 as the target:-

#include <SoftwareSerial.h>

#define rxPin 3
#define txPin 4

SoftwareSerial mySerial(rxPin, txPin);

void setup()
{
    mySerial.begin(9600);
}

void loop(){}