HardLabs

Ithowifi 4l

arjenhiemstra·ithowifi_hardware·non-cve wifi module/ithowifi_4l.kicad_pcb

Ithowifi 4l PCB layout, top view — open source ESP32 board by arjenhiemstra

About the Ithowifi 4l PCB

Ithowifi 4l is an open source ESP32 PCB design by arjenhiemstra, published on GitHub. It is a 4-layer board measuring 63.1 × 49.8 mm, with 42 components from 26 distinct parts.

Its main chip is the ESP32-WROOM, from the ESP32 family. Other key parts include the CH340G, AMS1117-3.3 and 780xMT. By type, the board carries 13 resistors, 10 capacitors, 5 ICs, 4 transistors, 4 connectors and 2 switches.

Main components on the Ithowifi 4l

ESP32-WROOMCH340GAMS1117-3.3780xMT

Ithowifi 4l bill of materials (BOM)

42 components, 26 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP32-WROOM
U1
1
~
U2
1
CH340G
U3
1
AMS1117-3.3
U4
1
780xMT
U5
2
BSS138
Q1, Q2
2
BC847
Q3, Q4
1
Crystal_GND24_Small
Y1
1
CONN_02X03_ODD_EVEN
USB_B_Micro
J1
1
RJ45_LED_Shielded
J2
2
Conn_02x02_Odd_Even
J4, J5
1
MountingHole_Pad
H5
1
Fail safe
SW1
1
Reset
SW2
1
TX
LED1
1
RX
LED2
3
0.1uF
C1, C2, C7
1
22uF
C3
1
470uF
C4
3
10uF
C6, C8, C11
Show 6 more
QtyPartRefs
2
33pF
C9, C10
4
R10K
R1, R2, R3, R4
1
R100
R5
1
R10K
R100
R6
2
R1K
R7, R8
5
R10K
R9, R10, R11, R12, R13

Ithowifi 4l design files

The KiCad project lives in the arjenhiemstra/ithowifi_hardware repository on GitHub; these links point at the commit this page was built from.

Ithowifi 4l: common questions

What microcontroller does the Ithowifi 4l use?

The Ithowifi 4l is built around the ESP32-WROOM, from the ESP32 family.

How big is the Ithowifi 4l PCB?

The Ithowifi 4l measures 63.1 × 49.8 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Ithowifi 4l?

42 components, from 26 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 Ithowifi 4l design files?

From the arjenhiemstra/ithowifi_hardware 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 Ithowifi 4l design in my own project?

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

Can I test firmware for the Ithowifi 4l 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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