add i2c lib by Peter Fleury

main.c

@@ -6,6 +6,7 @@
 #include "buffer.h"
 #include "pid.h"
 #include "adc.h"
+#include "i2cmaster.h"
 
 void modbusGet(void);
 
@@ -41,6 +42,7 @@ int main(){
 	TIMSK0|=(1<<TOIE0);
 
     initADC();
+    i2c_init();
     sei();
 
     _delay_ms(1000);