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Twinkling butterfly

Normansrule·twinkling-butterfly·hardware/LED Butterfly/LED Butterfly.kicad_pcb

Twinkling butterfly PCB layout, top view — open source ESP32 board by Normansrule

About the Twinkling butterfly PCB

Twinkling butterfly is an open source ESP32 PCB design by Normansrule, published on GitHub under the MIT license. It is a 2-layer board measuring 83.8 × 63.3 mm, with 60 components from 29 distinct parts.

Its main chip is the ESP32-C3FH4, from the ESP32 family. Other key parts include the MCP73831T-2ACI/OT, AP2112K-3.3TRG1, USBLC6-2SC6 and FT231XS-R. By type, the board carries 24 capacitors, 15 resistors, 7 diodes, 4 ICs, 2 transistors and 2 battery holders.

It belongs with the displays & leds and power & battery designs in this gallery.

From the project

USB-C VBUS feeds an MCP73831 charger (~42 mA) into two LIR2032 cells in parallel, and feeds the FT231XS bridge directly. The cells run through slide switch SW1 into an AP2112K regulator for the ESP32-C3FH4. The bridge's DTR#/RTS# lines drive a cross-coupled transistor pair that p

USB-C VBUS feeds an MCP73831 charger (~42 mA) into two LIR2032 cells in parallel, and feeds the FT231XS bridge directly. The cells run through slide switch SW1 into an AP2112K regulator for the ESP32-C3FH4. The bridge's DTR#/RTS# lines drive a cross-coupled transistor pair that pulls CHIPENABLE and BOOT, so esptool resets the chip and enters the bootloader by itself. GPIO4 drives the pixel chain from the switched battery* rail, not the regulator.

Twinkling butterfly, from the project README
From the project README

Main components on the Twinkling butterfly

MCP73831T-2ACI/OTAP2112K-3.3TRG1USBLC6-2SC6FT231XS-R

Twinkling butterfly bill of materials (BOM)

60 components, 29 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
MCP73831T-2ACI/OT
U2
1
AP2112K-3.3TRG1
U3
1
USBLC6-2SC6
U4
1
FT231XS-R
U5
2
MMBT2222A
Q1, Q2
1
USB4110-GF-A
J1
1
40.0MHz-Crystal
40.0MHz-Crystral
2
LIR2032
BT1a, BT1b
1
ESP32-C3FH4
ESP32-C3FH4
1
JS102011SAQN
SW1
1
USB_D+
TP1
1
USB_D-
TP2
6
WS2812B
D1, D2, D3, D4, D5, D6
1
LED_CHG
D7
2
C1206C120J5GACTU
12pF
C3, C4
5
C1206C104K5RACTU
0.1uF
C5, C6, C7, C8, C9
2
C1206C105K3RACTU
1uF
C10, C11
1
CL31A106KAHNNNE
10uF
C12
3
C1206C475K8RACTU
4.7uF
C13, C16, C17
8
C1206C104K5RACTU
100nF
C14, C15, C20, C21, C22, C23, C24, C25
Show 9 more
QtyPartRefs
2
C1206C105K3RACTU
1uF
C18, C19
1
470UF
470uF
C26
4
RC1206FR-0710KL
10kOhm
R1, R2, R3, R4
2
RC1206FR-075K1L
5.1k
R5, R6
2
RC1206FR-0710KL
10k
R7, R8
3
RC1206FR-07470RL
470
R9, R10, R15
2
RC1206FR-0727RL
27
R11, R12
1
RC1206FR-071KL
1k
R13
1
RC1206FR-0724KL
24k
R14

Twinkling butterfly design files

The KiCad project lives in the Normansrule/twinkling-butterfly repository on GitHub; these links point at the commit this page was built from.

Twinkling butterfly: common questions

What microcontroller does the Twinkling butterfly use?

The Twinkling butterfly is built around the ESP32-C3FH4, from the ESP32 family.

How big is the Twinkling butterfly PCB?

The Twinkling butterfly measures 83.8 × 63.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Twinkling butterfly?

60 components, from 29 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 Twinkling butterfly design files?

From the Normansrule/twinkling-butterfly repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Twinkling butterfly design in my own project?

Yes, under the terms of its MIT license, which Normansrule chose for the repository.

Can I test firmware for the Twinkling butterfly 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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