HardLabs

UTAC

X-zeed·UTAC-PCB·pcb/pcb.kicad_pcb

UTAC PCB layout, top view — open source ESP32 board by X-zeed

About the UTAC PCB

UTAC is an open source ESP32 PCB design by X-zeed, published on GitHub. It is a 2-layer board measuring 104 × 60 mm, with 59 components from 25 distinct parts.

Its main chip is the ESP32-C3_SUPERMINI_TH, from the ESP32 family. Other key parts include the LM2577T-ADJ_NOPB. By type, the board carries 19 resistors, 11 connectors, 8 capacitors, 5 diodes, 4 transistors and 4 relays.

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

From the project

4-channel smart relay control board with ESP32-C3 SuperMini - KiCad PCB Design v0.2.0

UTAC PCB is a compact, mains-powered relay control board designed for home automation and industrial switching applications. It features four independently controllable relay channels driven by an ESP32-C3 SuperMini, enabling Wi-Fi and Bluetooth control without an external power adapter.

- 4 relay channels — SPDT 5 V relays (SRA-05VDC-CL), rated for mains-level switching - ESP32-C3 SuperMini — Wi-Fi 4 (802.11 b/g/n) + Bluetooth 5 LE MCU - Onboard AC–DC supply — Hi-Link HLK-10M05 module (100–240 V AC → 5 V / 2 A DC) - Boost converter — LM2577T-ADJ provides an adjustable higher-voltage rail -…

Main components on the UTAC

ESP32-C3_SUPERMINI_THLM2577T-ADJ_NOPB

UTAC bill of materials (BOM)

59 components, 25 distinct parts.

QtyPartRefs
1
ESP32-C3_SUPERMINI_TH
U1
1
LM2577T-ADJ_NOPB
U2
4
MMBT2222A
Q1, Q2, Q3, Q4
5
Screw_Terminal_01x03
J1, J11, J12, J13, J14
1
Screw_Terminal_01x04
J2
1
Conn_01x01_Pin
J3
3
Conn_01x05_Socket
J4, J5, J6
1
Conn_01x02_Socket
J15
4
SRA-05VDC-CL
K1, K2, K3, K4
1
HLK-10M05
PS1
4
LED
LED1, LED2, LED3, LED4
4
MRA4003T3G
D1, D2, D3, D4
1
1N5821
D5
1
100uH
L1
1
100n
C1
4
10n
C2, C3, C4, C5
1
0.1u
C6
1
0.33u
C7
1
680u
C8
4
1K
R1, R5, R9, R13
Show 5 more
QtyPartRefs
8
10K
R2, R3, R6, R7, R10, R11, R14, R15
4
100
R4, R8, R12, R16
1
17.4k
R17
1
2k
R18
1
2.2k
R19

UTAC design files

The KiCad project lives in the X-zeed/UTAC-PCB repository on GitHub; these links point at the commit this page was built from.

UTAC: common questions

What microcontroller does the UTAC use?

The UTAC is built around the ESP32-C3_SUPERMINI_TH, from the ESP32 family.

How big is the UTAC PCB?

The UTAC measures 104 × 60 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the UTAC?

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

Where can I download the UTAC design files?

From the X-zeed/UTAC-PCB repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the UTAC design in my own project?

The repository has no license, so all rights stay with X-zeed. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the UTAC 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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