Pi pico guitar tuner

Krovikan-Vamp·pi-pico-guitar-tuner·kicad/auto-guitar-tuner/auto-guitar-tuner.kicad_pcb

About the Pi pico guitar tuner PCB

Pi pico guitar tuner is an open source RP2040/RP2350 PCB design by Krovikan-Vamp, published on GitHub under the BSD-3-Clause license. It is a 2-layer board measuring 56.8 × 139.2 mm, with 50 components from 24 distinct parts.

Its main chip is the Pico, from the RP2040/RP2350 family. Other key parts include the MAX4465, OPAMP, STC4054 and L293D. By type, the board carries 19 resistors, 14 capacitors, 5 ICs, 5 connectors, 4 switches and 1 transistor.

It belongs with the audio designs in this gallery.

From the project

This project provides source code and 3D-printable files for an automatic guitar tuner based off Band Industries' Roadie 3. The source code in this project is licensed under the 3-clause BSD license. No further updates planned for this project

1. The Raspberry Pi Pico SDK is a submodule of this repo. Access to the SDK is required to build this project.

Pi pico guitar tuner, from the project README — From the project README

Main components on the Pi pico guitar tuner

MAX4465OPAMPSTC4054Pico L293D

Pi pico guitar tuner bill of materials (BOM)

50 components, 24 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	MAX4465 Max4465	TSOP-5_1.65x3.05mm_P0.95mm	U1
1	OPAMP	DIP-8_W7.62mm	U2
1	STC4054	TSOT-23-5_HandSoldering	U3
1	Pico	RPi_Pico_SMD_TH	U4
1	L293D	DIP-16_W7.62mm	U5
1	P-FET	TO-220-3_Vertical	Q1
1	AUDIOJACK3_SWITCH AudioJack3_Switch	Jack_6.35mm_Neutrik_NMJ6HCD2_Horizontal	J1
1	CONN_01X03 Conn_01x03	PinSocket_1x03_P2.54mm_Vertical	J2
1	CONN_01X08 Conn_01x08	PinSocket_1x08_P2.54mm_Vertical	J3
2	CONN_01X02 Conn_01x02	JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal	J4, J5
1	Microphone	ELECTRET-MIC-CMA-4544PF-W	MK1
1	500K 500k	Potentiometer_Bourns_3214G_Horizontal	RV1
4	SW_PUSH	SW_PUSH_6mm	SW1, SW2, SW3, SW4
6	0.1UF 0.1uF	C_0805_2012Metric	C1, C4, C11, C12, C13, C14
1	0.01UF 0.01uF	C_0805_2012Metric	C2
2	1UF 1uF	C_0805_2012Metric	C3, C10
1	4.7UF 4.7uF	C_0805_2012Metric	C5
2	100PF 100pF	C_0805_2012Metric	C6, C8
2	6.8NF 6.8nF	C_0805_2012Metric	C7, C9
5	2k	R_0805_2012Metric	R1, R2, R8, R9, R19

Show 4 more

Qty	Part	Footprint	Refs
5	10K 10k	R_0805_2012Metric	R3, R4, R10, R14, R15
4	1M	R_0805_2012Metric	R5, R6, R7, R11
3	4.7K 4.7k	R_0805_2012Metric	R12, R16, R18
2	100K 100k	R_0805_2012Metric	R13, R17

Pi pico guitar tuner design files

The KiCad project lives in the Krovikan-Vamp/pi-pico-guitar-tuner repository on GitHub; these links point at the commit this page was built from.

Pi pico guitar tuner: common questions

What microcontroller does the Pi pico guitar tuner use?

The Pi pico guitar tuner is built around the Pico, from the RP2040/RP2350 family.

How big is the Pi pico guitar tuner PCB?

The Pi pico guitar tuner measures 56.8 × 139.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Pi pico guitar tuner?

50 components, from 24 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Pi pico guitar tuner design files?

From the Krovikan-Vamp/pi-pico-guitar-tuner repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Pi pico guitar tuner design in my own project?

Yes, under the terms of its BSD-3-Clause license, which Krovikan-Vamp chose for the repository.

Can I test firmware for the Pi pico guitar tuner without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.