HardLabs

ULX4M-CM4-HAT

intergalaktik·ULX4M-CM4-HAT

ULX4M-CM4-HAT layout, top view — open source ESP32 board by intergalaktik

About the ULX4M-CM4-HAT

ULX4M-CM4-HAT is an open source ESP32 PCB design by intergalaktik, published on GitHub under the GPL-3.0 license. It is a 4-layer board measuring 65 × 56 mm, with 37 components from 19 distinct parts.

Its main chip is the ESP32, from the ESP32 family. Other key parts include the LM1117-3.3 and FT231XS. By type, the board carries 12 capacitors, 12 resistors, 4 diodes, 3 ICs, 3 switches and 2 connectors.

It belongs with the dev boards & breakouts, audio and iot & wireless designs in this gallery.

From the project

On V1 we have FTDI to FPGA working and we can upload bitstream to FPGA, serial passtrue is also working. For some reason it was hard to put ESP32 into bootloader mode, and I was not able to load micropython while shiled was connected to FPGA. After doing that directly (bricking p

On V1 we have FTDI to FPGA working and we can upload bitstream to FPGA, serial passtrue is also working. For some reason it was hard to put ESP32 into bootloader mode, and I was not able to load micropython while shiled was connected to FPGA. After doing that directly (bricking pins on shield FTDI TX > ESP32 RX, ESP32 TX > FTDI RX, GPIO0 > GND) I have succesfully loaded micropython on ESP32. WROOM is still not perfect fit as it has low memory. WROWER can access shared SD card, and flash FPGA over WIFI.

ULX4M-CM4-HAT, from the project README
From the project README

Main components on the ULX4M-CM4-HAT

LM1117-3.3FT231XSESP32

ULX4M-CM4-HAT bill of materials (BOM)

37 components, 19 distinct parts.

QtyPartRefs
1
LM1117-3.3
U1
1
FT231XS
U2
1
ESP32
U9
1
Raspberry_Pi_2_3
J1
1
CONN_02X03
J4
1
WIFI ENABLE
SW1
1
BTN2
SW2
1
BTN1
SW3
1
MICRO_USB
US1
2
R
D1, D4
1
B
D2
1
G
D3
4
100n
C1, C4, C6, C10
4
10n
C2, C5, C7, C11
4
22uF
C3, C8, C9, C21
5
549
R1, R2, R5, R6, R35
2
1K
R3, R4
3
15k
R9, R34, R56
2
27
R49, R50

ULX4M-CM4-HAT design files

The KiCad project lives in the intergalaktik/ULX4M-CM4-HAT repository on GitHub; these links point at the commit this page was built from.

ULX4M-CM4-HAT: common questions

What microcontroller does the ULX4M-CM4-HAT use?

The ULX4M-CM4-HAT is built around the ESP32, from the ESP32 family.

How big is the ULX4M-CM4-HAT?

The ULX4M-CM4-HAT measures 65 × 56 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the ULX4M-CM4-HAT?

37 components, from 19 distinct parts. The full bill of materials is listed on this page.

Where can I download the ULX4M-CM4-HAT design files?

From the intergalaktik/ULX4M-CM4-HAT repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the ULX4M-CM4-HAT design in my own project?

Yes, under the terms of its GPL-3.0 license, which intergalaktik chose for the repository.

Can I test firmware for the ULX4M-CM4-HAT 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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