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Advanced-RetroWiFiModem

oe3gwu·Advanced-RetroWiFiModem·kicad/wemos/RetroWiFiModem.kicad_pcb

Advanced-RetroWiFiModem PCB layout, top view — open source ESP8266 board by oe3gwu
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About the Advanced-RetroWiFiModem PCB

Advanced-RetroWiFiModem is an open source ESP8266 PCB design by oe3gwu, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 100 × 66.1 mm, with 29 components from 18 distinct parts.

Its main chip is the WeMos_mini, from the ESP8266 family. Other key parts include the MAX3237ECDWR, 74HCT245D, SN74HC32DR, L4931CZ33-AP and DFPlayer_Mini. By type, the board carries 9 diodes, 8 capacitors, 6 ICs, 3 resistors, 2 connectors and 1 speaker.

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

From the project

An ESP based RS232 <-> WiFi modem with Hayes AT, PPP/NAT, DFU style commands and LED indicators

An RS-232 WiFi modem with Hayes AT commands, status LEDs, and a full set of RS-232 control lines.

This repository offers one Wemos PCB (kicad/wemos/) and two firmware variants (pick the module, flash the matching firmware):

After swapping modules, flash the correct firmware and run AT&F once (EEPROM magic differs per platform).

Why both modules fit mechanically and electrically

Main components on the Advanced-RetroWiFiModem

MAX3237ECDWR74HCT245DSN74HC32DRL4931CZ33-APWeMos_miniDFPlayer_Mini

Advanced-RetroWiFiModem bill of materials (BOM)

29 components, 18 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
MAX3237ECDWR
MAX3237CAI+
U1
1
74HCT245D
74HCT245
U2
1
SN74HC32DR
74HC32
U3
1
L4931CZ33-AP
U4
1
WeMos_mini
U5
1
DFPlayer_Mini
U6
1
BarrelJack_Horizontal
CON1
1
CONN_02X05
P1
1
AUD-013
Speaker
LS1
2
TLPR5600
D1, D2
6
TLPR5600
D3, D4, D5, D6, D7, D8
1
1N4148
D9
4
100nF
C1, C2, C4, C5
2
100NF
100nF
C3, C8
1
100nF
C6
1
1UF
1uF
C7
1
560R
R1
2
10K
R9, R10

Advanced-RetroWiFiModem design files

The KiCad project lives in the oe3gwu/Advanced-RetroWiFiModem repository on GitHub; these links point at the commit this page was built from.

Advanced-RetroWiFiModem: common questions

What microcontroller does the Advanced-RetroWiFiModem use?

The Advanced-RetroWiFiModem is built around the WeMos_mini, from the ESP8266 family.

How big is the Advanced-RetroWiFiModem PCB?

The Advanced-RetroWiFiModem measures 100 × 66.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Advanced-RetroWiFiModem?

29 components, from 18 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 Advanced-RetroWiFiModem design files?

From the oe3gwu/Advanced-RetroWiFiModem 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 Advanced-RetroWiFiModem design in my own project?

Yes, under the terms of its GPL-3.0 license, which oe3gwu chose for the repository.

Can I test firmware for the Advanced-RetroWiFiModem without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP8266 firmware against it before you order a PCB.

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