PicoWiFiModem

mecparts·PicoWiFiModem·kicad/Pico_Wifi_modem.kicad_pcb

About the PicoWiFiModem PCB

PicoWiFiModem is an open source RP2040/RP2350 PCB design by mecparts, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 100 × 66.1 mm, with 33 components from 14 distinct parts.

Its main chip is the Pico, from the RP2040/RP2350 family. Other key parts include the MAX3237ECDWR, 74HCT245, LM2950ACZ-3.3 and AT24C32E-PUM. By type, the board carries 10 resistors, 9 diodes, 7 capacitors, 5 ICs and 2 connectors.

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

From the project

A Pico W based RS232 <-> WiFi modem with Hayes AT style commands and LED indicators

This project began as an exercise to learn about the Pico W and lwIP. Then, as I figured things out, it sort of took on a life of its own...

The code was ported from my Retro WiFi Modem. One look at it will betray its Arduino IDE origin! It's definitely not the most efficient way to do things in the Pico world, but it worked well enough for my purposes in learning "okay, I know what I want to do here, but how does the Pico C/C++ SDK do it?"

PicoWiFiModem, from the project README — From the project README

Main components on the PicoWiFiModem

MAX3237ECDWR 74HCT245 Pico LM2950ACZ-3.3 AT24C32E-PUM

PicoWiFiModem bill of materials (BOM)

33 components, 14 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	MAX3237ECDWR MAX3237CAI+	SOIC-28W_7.5x17.9mm_Pitch1.27mm	U1
1	74HCT245	DIP-20_W7.62mm_LongPads	U2
1	Pico	RPi_PicoW	U3
1	LM2950ACZ-3.3	TO-92_Inline_Narrow_Oval	U4
1	AT24C32E-PUM 24LC32	DIP-8_W7.62mm_LongPads	U5
1	BARREL_JACK	BARREL_JACK	CON1
1	CONN_02X05	IDC_Header_Straight_10pins	P1
8	TLPR5600	LED-3MM	D1, D2, D3, D4, D5, D6, D7, D8
1	1N5817	Diode_DO-41_SOD81_Horizontal_RM10	D12
5	100NF 100nF	C_Disc_D3_P2.5	C1, C2, C3, C4, C5
1	100NF 100nF	C_Disc_D3_P5	C6
1	1UF 1uF	C_Disc_D3_P2.5	C7
8	560R	R3	R1, R2, R3, R4, R5, R6, R7, R8
2	3.9K	R3	R12, R13

PicoWiFiModem design files

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

PicoWiFiModem: common questions

What microcontroller does the PicoWiFiModem use?

The PicoWiFiModem is built around the Pico, from the RP2040/RP2350 family.

How big is the PicoWiFiModem PCB?

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

How many components are on the PicoWiFiModem?

33 components, from 14 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 PicoWiFiModem design files?

From the mecparts/PicoWiFiModem repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the PicoWiFiModem design in my own project?

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

Can I test firmware for the PicoWiFiModem without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.