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Split flap

tinkermax·split-flap·PCBs/Kicad/Controller/split-flap.kicad_pcb

Split flap PCB layout, top view — open source ESP32 board by tinkermax
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About the Split flap PCB

Split flap is an open source ESP32 PCB design by tinkermax, published on GitHub under the CC-BY-4.0 license. It is a 2-layer board measuring 99.9 × 99.9 mm, with 24 components from 14 distinct parts.

Its main chip is the ESP32-DevKitC, from the ESP32 family. Other key parts include the LD1117V33 and MCP23017-E/SP. By type, the board carries 7 connectors, 5 capacitors, 4 ICs, 4 test points and 4 resistors.

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

From the project

DIY mechanical spli-flap display

This is an alternate electronics and firmware for David Kingsman's Split-Flap Display.

MYNTPSERVER "au.pool.ntp.org" // Set the best fitting NTP server (pool) for your location MYTZ "AEST-10AEDT,M10.1.0,M4.1.0/3" // Set your time zone from https://github.com/nayarsystems/posixtz_db/blob/master/zones.csv

WORDNIKAPIKEY "" // Get your private key from https://developer.wordnik.com/ MINWORDLEN 9 // Specify minimum word length to fetch from Wordnik WORDUPDATESPERHOUR 1 // Set number of word updates from https://wordnik.com per hour. 0 will disable, else use an integer that results in an exact…

Split flap, from the project README
From the project README

Main components on the Split flap

LD1117V33ESP32-DevKitCMCP23017-E/SP

Split flap bill of materials (BOM)

24 components, 14 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
LD1117V33
STMicroelectronics
U1
1
ESP32-DevKitC
U2
2
MCP23017-E/SP
MCP23017
Microchip Technology
U3, U4
1
+9V IN
J1
1
Chain I2C
J2
1
SENS3
Button1
J3
1
Button2
J4
1
SENS2
Units 0-3
J5
1
Units 4-7
J6
1
SENS1
Units 8-11
J7
4
5000
Keystone Electronics
TP1, TP2, TP3, TP4
4
100UF
100nF
C1, C3, C4, C5
1
100UF
10uF
C2
4
4K7
R1, R2, R3, R4

Split flap design files

The KiCad project lives in the tinkermax/split-flap repository on GitHub; these links point at the commit this page was built from.

Split flap: common questions

What microcontroller does the Split flap use?

The Split flap is built around the ESP32-DevKitC, from the ESP32 family.

How big is the Split flap PCB?

The Split flap measures 99.9 × 99.9 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Split flap?

24 components, from 14 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 Split flap design files?

From the tinkermax/split-flap 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 Split flap design in my own project?

Yes, under the terms of its CC-BY-4.0 license, which tinkermax chose for the repository.

Can I test firmware for the Split flap 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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