Journal: Scientific Reports

Article Title: A compact acoustic spanner to rotate macroscopic objects

doi: 10.1038/s41598-019-43046-4

Figure Lengend Snippet: 3D printed acoustic spanner. An exploded view of the main components of the acoustic spanner is shown in ( a ). These are: a custom built amplifiers and filters electronic board (1); an Arduino Due microcontroller (2); 3D-printed connecting structures (3) and (6); the 3D-printed ‘funnel’ acoustic-guide (4); eight mini-speakers (5); and a sample holder (8). The generated OAM acoustic field is artistically represented in (7). Photographs of the assembled acoustic spanner are shown from the bottom ( b ) and from the side ( c ).

Article Snippet: We chose to use an Arduino Due microcontroller board, taking advantage of the ample processing power of its Atmel SAM3X8E ARM Cortex-M3 microcontroller and more importantly, its numerous PWM-output channels, allowing us to generate the desired number of phased sinusoidal-signals.

Techniques: Generated

Journal: Scientific Reports

Article Title: A compact acoustic spanner to rotate macroscopic objects

doi: 10.1038/s41598-019-43046-4

Figure Lengend Snippet: Block diagram of the Acoustic Spanner electronics. The DDS algorithms and PWM signals are implemented on an Arduino Due microcontroller platform. A custom PCB contains the individual low-pass filters and power amplifiers for generating the audio signals. The amplified audio signals are fed to their corresponding loudspeakers, which are housed in a 3D printed funnel-shaped acoustic-guide structure. Some connections to the loudspeakers have been omitted for clarity.

Article Snippet: We chose to use an Arduino Due microcontroller board, taking advantage of the ample processing power of its Atmel SAM3X8E ARM Cortex-M3 microcontroller and more importantly, its numerous PWM-output channels, allowing us to generate the desired number of phased sinusoidal-signals.

Techniques: Blocking Assay, Amplification