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Bx tacho

dazchi·bx-tacho·hardware/bx-tacho.kicad_pcb

Bx tacho PCB layout, top view — open source ESP32 board by dazchi

About the Bx tacho PCB

Bx tacho is an open source ESP32 PCB design by dazchi, published on GitHub under the GPL-3.0 license. It is a 4-layer board measuring 56 × 28 mm, with 49 components from 29 distinct parts.

Its main chip is the ESP32-C3-WROOM-02, from the ESP32 family. Other key parts include the TP4054, LMV331IDBVR and HS96L03W2C03. By type, the board carries 21 resistors, 12 capacitors, 4 ICs, 3 switches, 2 connectors and 2 diodes.

It belongs with the iot & wireless, displays & leds and sensors designs in this gallery.

From the project

Open DIY Beyblade X launcher RPM meter: ESP32-C3 with IR sensors and an OLED, Bluetooth (Battle Pass protocol), and a browser app for shot data and firmware updates. KiCad hardware, ESP-IDF firmware, 3D-printed case.

An open, DIY launch RPM meter for Beyblade X launchers. It clips onto the back of the launcher, reads the launcher's spinning black/white pattern with an IR sensor, and shows the launch RPM on a small OLED.

Web app: dazchi.github.io/bx-tacho (Chrome or Edge on a computer, Chrome on Android)

- Measures launch RPM optically, up to about 20,000 RPM, and shows the result and the peak on the display. - Senses when a Bey is loaded and when it's released, so each shot is recorded automatically: no buttons to press. - Keeps a shot history: the last 50 shots, the total count, the best shot and the…

Bx tacho, from the project README
From the project README

Main components on the Bx tacho

TP4054LMV331IDBVRESP32-C3-WROOM-02HS96L03W2C03

Bx tacho bill of materials (BOM)

49 components, 29 distinct parts.

QtyPartRefs
1
TP4054
TP4054_C5381776
JSMSEMI(杰盛微)
U1
1
LMV331IDBVR
U2
1
ESP32-C3-WROOM-02
U3
1
HS96L03W2C03
HS(汉昇)
U4
1
AO3401A
Q1
1
Conn_01x02
J1
1
Conn_01x04
J2
2
ITR8307/S17/TR8(B)
ITR8307/S17/TR8
EVERLIGHT(亿光)
KEY1, KEY2
1
ME6211C33M5G-N
MICRONE(南京微盟)
LDO1
1
SK-12D02-G060
G-Switch(品赞)
SW1
2
TS-1101-C-W
XKB Connection(中国星坤)
SW2, SW3
1
TYPE-C 16PIN 2MD(073)
TYPE-C 16PIN 2MD
SHOU HAN(首韩)
USB1
1
B5819W SL
B5819W
JSCJ
D1
1
LED
D2
2
10uF
C1, C9
4
1uF
C2, C3, C4, C6
4
100nF
C5, C7, C8, C11
1
10nF
C10
1
2.2nF
C12
2
5.1k
R1, R8
Show 9 more
QtyPartRefs
1
68k
R2
2
470k
R3, R9
7
10k
R4, R6, R12, R14, R16, R17, R20
2
100k
R5, R7
2
220
R10, R19
1
4.7M
R11
1
100
R13
1
22k
R15
2
4.7k
R21, R22

Bx tacho design files

The KiCad project lives in the dazchi/bx-tacho repository on GitHub; these links point at the commit this page was built from.

Bx tacho: common questions

What microcontroller does the Bx tacho use?

The Bx tacho is built around the ESP32-C3-WROOM-02, from the ESP32 family.

How big is the Bx tacho PCB?

The Bx tacho measures 56 × 28 mm, has 4 copper layers and is 1.6062 mm thick.

How many components are on the Bx tacho?

49 components, from 29 distinct parts. The full bill of materials is listed on this page.

Where can I download the Bx tacho design files?

From the dazchi/bx-tacho repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Bx tacho design in my own project?

Yes, under the terms of its GPL-3.0 license, which dazchi chose for the repository.

Can I test firmware for the Bx tacho 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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