Here's a sentence you don't read every day: someone turned a Raspberry Pi Pico W into a USB Wi-Fi adapter. Not a hack. Not a proof-of-concept that requires a soldering iron and a prayer. A working, functional adapter that costs six dollars.
The project, posted to GitLab by a developer who goes by baiyibai, does exactly what it says on the tin. Plug a Pico W into your computer's USB port, and bam—the computer sees it as a wireless network interface. It's that simple. And that absurd.
Let me be clear: the Raspberry Pi Pico W is a microcontroller board designed for blinking LEDs and reading temperature sensors. It is not supposed to replace your TP-Link dongle. But here we are.
How It Works (And Why You Should Care)
The Pico W uses the Infineon CYW43439 chip for Wi-Fi. Same silicon you'd find in commercial adapters. The trick is firmware: baiyibai's code makes the Pico W present itself as a standard USB Ethernet/RNDIS device. Your operating system thinks it's talking to a normal network adapter. It has no idea it's talking to a $6 board with a plastic case you probably bought for a robotics project.
Performance? It's 2.4 GHz only, maxes out around 10-15 Mbps in real-world tests. That's not going to stream 4K Netflix. But for browsing, email, IoT control? It's plenty. And it uses less power than most USB adapters—about 100 mA under load. Your laptop battery thanks you.
"This is the kind of project that makes you wonder why commercial Wi-Fi adapters still cost $20."
The setup process is dead simple: flash the firmware, plug it in, connect to Wi-Fi. No drivers needed on Linux. Windows might pout for a second, but after it grabs the generic RNDIS driver, it works. macOS? In our tests, it worked out of the box. Take that, Apple.
The Bigger Picture: Repurposing Hardware for Fun and Profit
This isn't the first time someone has turned a cheap microcontroller into something it was never meant to be. Remember the ESP8266? That $2 chip became the backbone of a thousand smart home projects. The Pico W is following the same trajectory—except it's doing it with USB built-in, which makes it far more versatile.
Think about it: the Pico W has a dual-core ARM Cortex-M0+ running at 133 MHz, 264 KB of RAM, and 2 MB of flash. It costs less than a burrito. Now it can also be a Wi-Fi adapter. What else can it be? A tiny VPN router? A network sniffer? A deauth detector? The only limit is how much time you're willing to spend in the C compiler.
And that's the real story here. We're living in an era where a $6 piece of hardware can replace a $20 piece of hardware that does one thing. The Pico W does that one thing, plus a hundred others. The only reason we don't all use them is convenience. We buy the dedicated dongle because it comes in a box and works. But for tinkerers—for people who like knowing exactly what their hardware is doing—this project is a goldmine.
Why Silicon Valley Should Be Nervous
Companies like TP-Link, Netgear, and D-Link have made billions selling dumb peripherals. A Wi-Fi adapter is a commodity. It has been for years. But if a hobbyist can duplicate its functionality with off-the-shelf parts for a third of the price, the commodity gets cheaper. The margins get thinner. And the incumbents have to innovate or die.
They won't die tomorrow. But projects like this nibble at the edges. They remind us that the hardware industry's pricing is often arbitrary. A Wi-Fi adapter costs $20 not because it costs $20 to make, but because that's what the market will bear. The BOM for a USB Wi-Fi adapter is maybe $3. The rest is markup, marketing, and middlemen. The Pico W exposes that.
And it's not just Wi-Fi adapters. The Pico W can emulate keyboards, mice, game controllers. It can be a serial adapter. A logic analyzer. A weather station. All for $6. The Raspberry Pi Foundation has, intentionally or not, created a platform that cannibalizes entire categories of consumer electronics.
That should terrify anyone who sells a single-purpose USB dongle.
The Practical Takeaway: Should You Build One?
If you have a Pico W sitting in a drawer—and let's be honest, you probably bought one during the pandemic and did nothing with it—this is a ten-minute project that gives you a functional Wi-Fi adapter. You'll learn about firmware flashing, USB device classes, and Linux networking. It's a fun Friday night project.
If you don't have a Pico W, buying one for this purpose alone is borderline. The Pico W costs $6, but you'll also need a micro USB cable. And patience. And if you just want a Wi-Fi adapter, spending $10 on Amazon gets you one that works instantly and has a warranty. This project is for the curious, not the impatient.
But if you're curious? Go do it. The firmware is on GitLab. The instructions are clear. And you'll have the satisfaction of knowing that your network is powered by a microcontroller that you programmed yourself.
That's something no $20 dongle can give you.
Alex Novak is a senior technology correspondent. He has never met a single-purpose gadget he didn't want to hack. Reach him at alex.novak@independentjournalist.com.
