Is it possible to communicate between two ATtiny85? I can use my Arduino to communicate with ATtiny85 by using Arduino Uno as the master and ATtiny85 as a slave. But I want to use one ATtiny85 as the master and one as a slave. Is this possible ?

I am not able to understand the examples given in TinyWireM library. I want a simple master and slave code for communication. For example, master should ask for 1 integer value and slave should reply.

My slave code :

#define I2C_SLAVE_ADDRESS 0x14 // Address of the slave #include <TinyWireS.h> int i=0; void setup() { TinyWireS.begin(I2C_SLAVE_ADDRESS); // join i2c network TinyWireS.onRequest(requestEvent); } void loop() { TinyWireS_stop_check(); } void requestEvent() { if(i==1000) { TinyWireS.send(1); i=0; } else i++; }

My master code

#include <TinyWireM.h> #define DS1621_ADDR 0x14 void setup() { TinyWireM.begin(); pinMode(4, OUTPUT); } void loop() { TinyWireM.requestFrom(DS1621_ADDR,4); // Request 1 byte from slave int tempC = TinyWireM.receive(); if(tempC) { digitalWrite(4, HIGH); delay(1000); // wait for a second digitalWrite(4, LOW); delay(1000); // wait for a second } if(tempC>1) { digitalWrite(4, HIGH); delay(1000); // wait for a second digitalWrite(4, LOW); // turn the LED off by making the voltage LOW delay(1000); // wait for a second } }

I tried the above code but still I cannot see the LED blinking. But if I keep slave code as it is and use the following master code on an Arduino then everything works fine.

Arduino Uno code as master.

#include <Wire.h> float i1=-1, i2=-1; void setup() { Wire.begin(); // join i2c bus (address optional for master) Serial.begin(9600); // start serial for output } void loop() { Wire.requestFrom(4, 1); // request 1 byte from slave address 4 while(Wire.available()) // slave may send less than requested { i1 = Wire.read(); // receive a byte as character Serial.println(i1); // print the character } }

connection is and connections are SDA to SCL pins

pin 5 of master attiny85 - pin 7 of slave attiny85 pin 7 of slave attiny85 - pin 5 of master attiny85

I also tried by no cross connecting them. example and connections are SDA to SDA pins

pin 5 of master attiny85 - pin 5 of slave attiny85 pin 7 of slave attiny85 - pin 7 of master attiny85

but still no success.