Add PlatformIO configuration

platformio.ini

@@ -0,0 +1,30 @@
+[platformio]
+src_dir = Arduino/RTI_Control
+
+[env:attiny84]
+platform = atmelavr
+board = attiny84
+framework = arduino
+
+; Set clock frequency to 8MHz (Internal)
+board_build.f_cpu = 8000000L
+
+; Fuses for ATtiny84 (8MHz internal oscillator, BOD disabled)
+; These are just for reference, PIO doesn't always set them automatically without extra steps
+; board_fuses.lfuse = 0xE2
+; board_fuses.hfuse = 0xDF
+; board_fuses.efuse = 0xFF
+
+; Upload protocol
+; If using Arduino as ISP:
+; upload_protocol = arduinoisp
+; upload_port = /dev/ttyACM0
+; upload_speed = 19200
+
+; If using USBasp:
+; upload_protocol = usbasp
+; upload_flags = -Pusb
+
+; Library dependencies
+lib_deps =
+    SoftwareSerial