Arduino Frequency Detector For Electrical Guitars

An Arduino code that recognizes an electrical guitar's frequency and its SPN and displays it to an LCD.

Features

• Recognizes electrical frequencies up to 4.8kHz

• Determines the SPN up to B6

• Displays the frequency and the SPN on an LCD

Built With

• Arduino IDE

Circuit

The signal must be amplified so that the Arduino can process it. The amplification is done by a non inverting operation amplifier, which amplifies it by 5.54 (Au = (100k/22k) + 1).

A DC Offset is necessary, because the Arduino's analog pins only work in the range between 0-5V. By making a voltage divider with 2 100k ohm resistors we "push" the base voltage to 2.5V, and by doing this we have room for the amplified signal, because the capacitor charges and discharges around this voltage.

LCD Wiring

• Vss, RW, K pins are grounded.

• Vdd, A pins are connected to 5V.

• V0 pin is responsible for the contrast on the LCD, connect it with a 10k potentiometer, so you are able to change the contrast for your liking.

• Wire the RS pin to the Arduino's PWM 1 pin.

• Wire the E pin to the Arduino's PWM 2 pin.

• Connect the last 4 data pins to the Arduino's PWM 4-7 pins in order.

Contributors

Buni Roland István, Szabadi Tibor, Szabó Bence, Török Milán