10.6084/m9.figshare.92060.v1 Brian Josey Brian Josey Anthony Salvagno Anthony Salvagno Anthony Salvagno Anthony Salvagno Steven j koc Steven j koc Arduino laserharp circuit figshare 2012 308l2012 308L2012 electronics electronics Applied Physics 2012-05-13 15:22:44 Figure https://figshare.com/articles/figure/Arduino_laserharp_circuit/92060 <p>Circuit for an Arduino based laserharp made from four resistors, three phototransistors and a speaker. Laser light passes through a diffraction grating at the bottom where it then splits and strikes three different phototransistors. To play a note, one of these beams of light needs to be interrupted.</p>