WILLIAM SOETANTO MYDAQ MUSICAL INSTRUMENT EXAMPLE ENGR 100 TA Theremin.

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Presentation transcript:

WILLIAM SOETANTO MYDAQ MUSICAL INSTRUMENT EXAMPLE ENGR 100 TA Theremin

History Invented by a physicist Leon Theremin, and patented in 1928 Lenin was impressed with the invention and started taking lessons Featured in 1951 The Day the Earth Stood Still, 1945 The Lost Weekend

Operation Method Played without physical contact Uses 2 Antennae forms the input  Pitch  Volume Hands become ground plate for antenna Becomes a variable capacitor LC circuit

Our Version

TSL 260R LF Light Intensity to Voltage Converter λ=940 nm Characteristics  VDD= 2.7–5.5 V  VOM= 3.3V at VDD=4.5V

Wiring Schematics TSL 260R LF

Software Design Steps Mapping analog to system input  Human hearing range Hz  Piano frequency range 16 – 5000 Hz  Amplitude range -2 to 2 V Harmonics vs True Tone  Pure sine waveform is true tone  Musical instrument never generate true tone Limitation  DAQ maximum sampling rate 200k Hz  DAQ audio out voltage -2 to 2 V

VI Front Panel

Wiring Diagram VI