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KM271-WiFi-ETHext

the78mole·km271-wifi·EXTENSIONS/ETH_W5500/ETH_W5500.kicad_pcb

KM271-WiFi-ETHext PCB layout, top view — open source board by the78mole

About the KM271-WiFi-ETHext PCB

KM271-WiFi-ETHext is an open source PCB design by the78mole, published on GitHub under the TAPR-OHL-1.0 license. It is a 2-layer board measuring 59.5 × 34.3 mm, with 67 components from 34 distinct parts.

Other key parts include the AP1117-33 and W5500. By type, the board carries 31 capacitors, 23 resistors, 3 connectors, 3 jumpers, 2 ICs and 2 diodes.

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

From the project

A piece of hardware to be installed in a Buderus Logamatic 2107 to provide control and status over WiFi

To achieve wired connectivity with the KM271-WiFi (e.g. in concrete basements without any WiFi), we decided to develop an Ethernet-Extension module, that is attached on the EXT (J7) connector via SPI interface.

For KM271-WiFi 0.1.0, you need to add a tiny fix-bridge to make it working.

Alternatively, when not experienced with soldering, you can add a wire to the ESP and the connector foot, but you need to use an insulated one:

KM271-WiFi-ETHext, from the project README
From the project README

Main components on the KM271-WiFi-ETHext

AP1117-33W5500

KM271-WiFi-ETHext bill of materials (BOM)

67 components, 34 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
AP1117-33
U2
1
W5500
U3
1
25M
Y1
1
EXT
J1
1
WE-634008137521
J2
1
MM-690367290876
J3
1
PM0
JP1
1
PM1
JP2
1
PM2
JP3
1
WUERTH_7490100111A
Wuerth_7490100111A
TR1
1
red
D9
1
green
D10
1
FB
L2
14
100N
100n
C1, C2, C9, C10, C12, C13, C16, C17 +6
2
10N
10n
C3, C18
1
4U7
4u7
C4
2
18P
18p
C7, C8
2
22U
22u
C11, C15
2
2U2
2u2
C14, C30
2
6N8
6n8
C20, C21
Show 14 more
QtyPartRefs
1
22N
22n
C22
4
4N7
4n7
C28, C31, C32, C34
1
1n
C33
2
0
R1, R2
1
1M
R3
1
12K4
R4
4
33
R5, R6, R7, R8
2
680
R9, R10
2
82
R11, R12
4
49R9
R13, R14, R20, R21
1
10
R15
2
75
R16, R17
2
150
R18, R19
2
330
R22, R23

KM271-WiFi-ETHext design files

The KiCad project lives in the the78mole/km271-wifi repository on GitHub; these links point at the commit this page was built from.

KM271-WiFi-ETHext: common questions

How big is the KM271-WiFi-ETHext PCB?

The KM271-WiFi-ETHext measures 59.5 × 34.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the KM271-WiFi-ETHext?

67 components, from 34 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 KM271-WiFi-ETHext design files?

From the the78mole/km271-wifi 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 KM271-WiFi-ETHext design in my own project?

Yes, under the terms of its TAPR-OHL-1.0 license, which the78mole chose for the repository.

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