Final Project Synth

Modules:

Wearable

• Variable oscillator
• When the off-board inductor was placed near metal, the frequency of oscillation would change.
• OpAmp
• Made the sine wave oscillation of the variable oscillator into a square wave, rail to rail
• Adafruit ESP32 Feather V2 - client
• Took the oscillation as an input
• Had a function which would calculate the period of the oscillation and sent a number 1 through 4 depending on the frequency via wifi to the ESP32 in the main module

Main Module

• Enclosure
• Adafruit ESP32 Feather V2 - server - receiver of harmonic info
• Receives a number 1 through 4
• Sets pins 12 and 13 high or low accordingly to output the two bits of information
• Level shifter
• Changes the high logic level from 3.3V on the Feather output to 5V for digital input pins in the Elegoo
• Sequencer Knobs
• Potentiometers which change the voltage into 4 different analog input pins in the Elegoo
• There is a log function within the main code which gives equal arc length on the knob to each note in the musical range of the output
• Elegoo - main code
• Had a timer overflow interrupt that was set up so that every 0.5 seconds it would…
• Change which of the 4 analog input pins it was reading from, effectively changing which of the 4 base notes was being set in the next bullet
• Call functions which would calculate and set the PWM variables so that the correct base note was played
• Call functions which would calculate and set PWM variables for the harmonic notes based on the digital input pins which were receiving the information from the wearable

Built With

• c++