Project based on modification of Ariel Rocholl code. Basic Arduino sketch was shrink and ported to ATtiny45 microcontroller. There was no needs for more buttons just than REC button for camera remote controll. Datagram byte for recording was changed from source HEX 0x3A to HEX 0x33 due to BlackMagic cameras LANC protocol variation.
Board circuit. Source code for ATtiny45: LancControl