HardLabs

Universal esp32-bridge

syntax-frame·universal-esp32-bridge

This repository ships a schematic but no board layout.

About the Universal esp32-bridge PCB

Universal esp32-bridge is an open source PCB design by syntax-frame, published on GitHub. It is a board, with 64 components from 22 distinct parts.

Other key parts include the EL357N. By type, the board carries 24 resistors, 8 ICs, 8 connectors, 8 test points, 8 diodes and 8 capacitors.

It belongs with the usb & debug tools designs in this gallery.

From the project

Low-voltage ESP32-S3 button/signal bridge: 8 isolated inputs, 8 PhotoMOS outputs, 2 relays, 4 cap-inject. NOT for mains.

Compact ESP32-S3 board for personal automation — safely interfaces with low-voltage buttons, LEDs, buzzers, and control panels (intercoms, appliance panels, remotes, ventilation controls).

Status: paper design, rev 0.1 (schematic notes + KiCad project skeleton; not yet laid out or prototyped).

- ESP32-S3-WROOM-1-N8 module (pre-certified, no PSRAM so GPIO35/36/37 stay free) - USB-C power + native USB-Serial-JTAG programming (no CH340/CP2102 needed) - 5 V external input + AMS1117-3.3 regulator - 8 optically isolated inputs (≈3–24 V DC, constant-current front end, active-low) - 8 PhotoMOS…

Main components on the Universal esp32-bridge

EL357N

Universal esp32-bridge bill of materials (BOM)

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

QtyPartRefs
8
EL357N
U4, U5, U6, U7, U8, U9, U10, U11
1
-
IN1
J5
1
-
IN2
J6
1
-
IN3
J7
1
-
IN4
J8
1
-
IN5
J9
1
-
IN6
J10
1
-
IN7
J11
1
-
IN8
J12
1
IN1
TP4
1
IN2
TP5
1
IN3
TP6
1
IN4
TP7
1
IN5
TP8
1
IN6
TP9
1
IN7
TP10
1
IN8
TP11
8
1N4148WS
D4, D5, D6, D7, D8, D9, D10, D11
8
100NF
100nF
C10, C11, C12, C13, C14, C15, C16, C17
8
2.2K
2.2k
R8, R11, R14, R17, R20, R23, R26, R29
Show 2 more
QtyPartRefs
8
10K
10k
R9, R12, R15, R18, R21, R24, R27, R30
8
1k
R10, R13, R16, R19, R22, R25, R28, R31

Universal esp32-bridge design files

The KiCad project lives in the syntax-frame/universal-esp32-bridge repository on GitHub; these links point at the commit this page was built from.

Universal esp32-bridge: common questions

How many components are on the Universal esp32-bridge?

64 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 Universal esp32-bridge design files?

From the syntax-frame/universal-esp32-bridge repository on GitHub, which has the schematic and the BOM; the links under Design files point to each one.

Can I use the Universal esp32-bridge design in my own project?

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

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