HardLabs

SerialTap

tfindlay-au·SerialTap·pcb/serialtap.kicad_pcb

SerialTap PCB layout, top view — open source ESP32 board by tfindlay-au

About the SerialTap PCB

SerialTap is an open source ESP32 PCB design by tfindlay-au, published on GitHub under the CERN-OHL-P-2.0 license. It is a 4-layer board measuring 54 × 22 mm, with 33 components from 22 distinct parts.

Its main chip is the ESP32-C3-MINI-1-H4X, from the ESP32 family. Other key parts include the TPS2553DBVR, LM66200DRLR, TPS62162DSGT, TXU0204RUTR and TPD4E05U06QDQARQ1. By type, the board carries 11 capacitors, 10 resistors, 6 ICs, 2 connectors, 2 switches and 1 diode.

It belongs with the iot & wireless designs in this gallery.

From the project

PCB Design for a drop in UART serial tap

An open-hardware board that puts an appliance's 5 V serial service port on Home Assistant. An ESP32-C3 with level translation, powered by the appliance itself: one 4-wire cable carries 5 V, GND, TX and RX.

The reference target is a Haier AS50QDFHRA split-system air conditioner, whose service port speaks GE Appliances GEA3 at 230400 8N1 (docs/gea3.md). The board is not specialised to it: any appliance exposing 5 V and a UART on a service connector is in scope.

SerialTap, from the project README
From the project README

Main components on the SerialTap

TPS2553DBVRLM66200DRLRTPS62162DSGTTXU0204RUTRTPD4E05U06QDQARQ1ESP32-C3-MINI-1-H4X

SerialTap bill of materials (BOM)

33 components, 22 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
TPS2553DBVR
TPS2553DBV
Texas Instruments
U1
1
LM66200DRLR
LM66200DRL
Texas Instruments
U2
1
TPS62162DSGT
TPS62162DSG
Texas Instruments
U3
1
TXU0204RUTR
TXU0204RUT
Texas Instruments
U4
1
TPD4E05U06QDQARQ1
TPD4E05U06DQA
Texas Instruments
U5
1
ESP32-C3-MINI-1-H4X
ESP32-C3-MINI-1
Espressif Systems
U6
1
B05B-XASK-1-A(LF)(SN)
B05B-XASK-1-A
JST
J1
1
USB4085-GF-A
GCT
J2
2
KMR211NGLFS
SW_Push
C&K (Littelfuse)
SW1, SW2
1
LTST-C191KGKT
LED
Lite-On
D1
1
XGL4020-222MEC
Coilcraft
L1
4
CL10B104KB8NNNC
0.1u
Samsung Electro-Mechanics
C1, C7, C8, C9
3
CL10B105KA8NNNC
1u
Samsung Electro-Mechanics
C2, C3, C11
1
PCL1A471MCL1GS
Nichicon
C4
2
CL31B106KAHNNNE
10u
Samsung Electro-Mechanics
C5, C10
1
CL32B226KAJNNNE
22u
Samsung Electro-Mechanics
C6
2
RK73H1JTTD3300F
330
KOA Speer
R1, R2
3
RK73H1JTTD5101F
5.1k
KOA Speer
R3, R4, R8
1
RK73H1JTTD6652F
66.5k
KOA Speer
R5
2
RK73H1JTTD1003F
100k
KOA Speer
R6, R7
Show 2 more
QtyPartRefs
1
RK73H1JTTD2201F
2.2k
KOA Speer
R9
1
RK73H1JTTD1002F
10k
KOA Speer
R10

SerialTap design files

The KiCad project lives in the tfindlay-au/SerialTap repository on GitHub; these links point at the commit this page was built from.

SerialTap: common questions

What microcontroller does the SerialTap use?

The SerialTap is built around the ESP32-C3-MINI-1-H4X, from the ESP32 family.

How big is the SerialTap PCB?

The SerialTap measures 54 × 22 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the SerialTap?

33 components, from 22 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 SerialTap design files?

From the tfindlay-au/SerialTap 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 SerialTap design in my own project?

Yes, under the terms of its CERN-OHL-P-2.0 license, which tfindlay-au chose for the repository.

Can I test firmware for the SerialTap 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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