Quantity   Component name
2 × M-Audio keystation 61es Preferably electronically dead
1 × 2m*2cm*2cm U-shaped aluminum bar only 1.65m is needed
1 × 2m*2cm*1.5cm L-shaped aluminium bar only 1.65m is needed
1 × Atmega88a Microprocessors, Microcontrollers, DSPs / ARM, RISC-Based Microcontrollers
1 × Atmega88a - Misc Crystal, capacitors ...
4 × 8bit parallel-out serial shift register 74164
1 × 8 conductors ribbon cable