diff --git a/src/MCP79412RTC.cpp b/src/MCP79412RTC.cpp
index 76ff0bf..3c9dd86 100644
--- a/src/MCP79412RTC.cpp
+++ b/src/MCP79412RTC.cpp
@@ -18,25 +18,15 @@
 // constructor; this parameter defaults to true if not given.
 
 #include <MCP79412RTC.h>
+#include <stdlib.h>
+#include "i2c.h"
 
-// define consistent I2C functions
-#if defined(__AVR_ATtiny44__) || defined(__AVR_ATtiny84__) || defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__)
-#include <TinyWireM.h>
-#define i2cBegin TinyWireM.begin
-#define i2cBeginTransmission TinyWireM.beginTransmission
-#define i2cEndTransmission TinyWireM.endTransmission
-#define i2cRequestFrom TinyWireM.requestFrom
-#define i2cRead TinyWireM.receive
-#define i2cWrite TinyWireM.send
-#else
-#include <Wire.h>
-#define i2cBegin Wire.begin
-#define i2cBeginTransmission Wire.beginTransmission
-#define i2cEndTransmission Wire.endTransmission
-#define i2cRequestFrom Wire.requestFrom
-#define i2cRead Wire.read
-#define i2cWrite Wire.write
-#endif
+#define i2cBegin i2c.begin
+#define i2cBeginTransmission i2c.beginTransmission
+#define i2cEndTransmission i2c.endTransmission
+#define i2cRequestFrom i2c.requestFrom
+#define i2cRead i2c.read
+#define i2cWrite i2c.write
 
 // MCP7941x I2C Addresses
 #define RTC_ADDR 0x6F
@@ -623,6 +613,4 @@ uint8_t __attribute__ ((noinline)) MCP79412RTC::bcd2dec(uint8_t n)
     return n - 6 * (n >> 4);
 }
 
-#if defined ARDUINO_ARCH_AVR
-MCP79412RTC RTC;      // instantiate an RTC object for AVR only
-#endif
+MCP79412RTC RTC;
diff --git a/src/MCP79412RTC.h b/src/MCP79412RTC.h
index a32e620..8593a31 100644
--- a/src/MCP79412RTC.h
+++ b/src/MCP79412RTC.h
@@ -20,8 +20,10 @@
 #ifndef MCP79412RTC_H_INCLUDED
 #define MCP79412RTC_H_INCLUDED
 
-#include <Arduino.h>
 #include <TimeLib.h>    // https://github.com/PaulStoffregen/Time
+#include <stdint.h>
+
+typedef uint8_t byte;
 
 // Alarm types for use with the enableAlarm() function
 enum {
@@ -90,9 +92,7 @@ class MCP79412RTC
         static uint8_t bcd2dec(uint8_t num);
 };
 
-#if defined ARDUINO_ARCH_AVR
 extern MCP79412RTC RTC;
-#endif
 
 #ifndef _BV
 #define _BV(bit) (1 << (bit))