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ESP-input

BasementCircuits·Sonus7·PCBs/ESP-input/ESP-input.kicad_pcb

ESP-input PCB layout, top view — open source ESP32 board by BasementCircuits
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About the ESP-input PCB

ESP-input is an open source ESP32 PCB design by BasementCircuits, published on GitHub under the CERN-OHL-W-2.0 license. It is a 2-layer board measuring 40 × 85 mm, with 25 components from 13 distinct parts.

Its main chip is the ESP32-WROVER-I, from the ESP32 family. Other key parts include the PCM5100 and NCP1117-3.3_SOT223. By type, the board carries 13 capacitors, 3 connectors, 3 resistors, 2 ICs, 2 switches and 1 module.

It belongs with the audio, test & measurement and iot & wireless designs in this gallery.

From the project

Analog seven-band spectrum bargraph with op amps.

Each band has a spacing of 1.25 octaves. The bands are: 63 Hz, 160 Hz, 400 Hz, 1.25 kHz, 2.5 kHz, 6.25 kHz, 16 kHz.

The filters are second-order Multiple Feedback bandpass filters using TLC272 opamps. The VU-meters consist of a logaritmic comparator array, also using TLC272 opamps. The project is inspired by a reel of 2000 TLC272 bought cheaply at an auction.

ESP-input, from the project README
From the project README

Main components on the ESP-input

PCM5100NCP1117-3.3_SOT223ESP32-WROVER-I

ESP-input bill of materials (BOM)

25 components, 13 distinct parts.

QtyPartRefs
1
PCM5100
U1
1
NCP1117-3.3_SOT223
U2
1
ESP32-WROVER-I
A1
1
AudioJack3
J1
1
Conn_01x04_Male
J2
1
Conn_01x04_Male
J3
1
SolderJumper_2_Open
JP1
2
SW_Push
SW1, SW2
5
10uF
C2, C4, C10, C14, C15
4
100nF
C3, C5, C7, C13
2
2.2uF
C8, C9
2
2.2nF
C11, C12
3
470R
R1, R2, R3

ESP-input design files

The KiCad project lives in the BasementCircuits/Sonus7 repository on GitHub; these links point at the commit this page was built from.

ESP-input: common questions

What microcontroller does the ESP-input use?

The ESP-input is built around the ESP32-WROVER-I, from the ESP32 family.

How big is the ESP-input PCB?

The ESP-input measures 40 × 85 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the ESP-input?

25 components, from 13 distinct parts. The full bill of materials is listed on this page.

Where can I download the ESP-input design files?

From the BasementCircuits/Sonus7 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the ESP-input design in my own project?

Yes, under the terms of its CERN-OHL-W-2.0 license, which BasementCircuits chose for the repository.

Can I test firmware for the ESP-input without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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