Bitmerse LLP
Protocol Interfaces


Bringing wireless convenience to serial connectivity

$10,839 raised

of $4,800 goal

225% Funded! Order Below

Available for pre-order.

$65 - $70

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WiSer allows you to establish a wireless, peer-to-peer serial connection between two devices. Debug code, log data, update firmware, or transfer files without the need for cumbersome USB cables, sketchy Wi-Fi routers, or Bluetooth configurations that never quite work right.

No Hassle, No Setup

Designed for simplicity and efficiency, WiSer requires no software, no drivers, and no setup. As far as your devices are concerned, it’s just a cable. Plug the USB module into your computer, connect the TTL module to your target device, open your favorite serial monitor, and enjoy being able to move around while you work!

Serial Connection Using USB-TTL Convertor

Wireless Serial Connection Using Host-to-Client WiSer Devices

WiSer is fully open source and works with a wide range of devices and operating systems. Whether you’re working on Windows, Linux, Mac, or Android, it provides a convenient, reliable solution for hassle-free serial communication via PuTTY, Tera Term, screen, or just about any other terminal application you can think of.

Bridging the Wireless Gap

While USB to UART converters are common in the market, the options become limited when seeking wireless functionality. Many existing solutions require custom software, drivers, or are tied to specific operating systems. Ready-to-use wireless serial bridges often require users to handle data over TCP or UDP. This, in turn, requires additional software bridging for the integration of data into serial applications.

WiSer Addresses These Challenges by…

For Developers, Engineers, and Hobbyists Alike

Whether you’re a professional in electronic engineering or an embedded systems enthusiast, WiSer caters to a broad spectrum of users. From initial board bring-up to debugging firmware, viewing logs, or flashing firmware, WiSer enhances the traditional USB to UART converter experience by offering true wireless freedom. It’s perfect for both professionals and hobbyists.

Key Benefits


WiSer opens up a world of possibilities for wireless serial connectivity…

Just Plug It In & Get to Work

WiSer’s plug-and-play nature makes it exceptionally easy to use. Take the Raspberry Pi, for example. Just connect WiSer-TTL to the Raspberry Pi’s serial port pins, as depicted in the image below, then plug WiSer-USB into the host system, and connect to the serial port using your preferred terminal software. Ensure that the serial port is enabled in the Raspberry Pi’s configuration file. For more detailed steps, visit here.

Need a Wireless Serial Connection Between Two Hosts?

The Host-to-Host version of WiSer includes two WiSer-USB devices. Plugging one into each host system establishes a wireless serial connection that can be used for various forms of host-to-host communication. For a more detailed example, see our Wireless Serial Communication Between Two Host Systems Using WiSer article on Hackaday.

Features & Specifications


FeatureWiSerUSR-WIFI232-A2PUSR USR-TCP232-T2EMW3162
Connection Type (to Host) USB Wi-Fi (TCP or UDP) RJ45 Wi-Fi (TCP)
Wireless ConnectivityYes Yes No Yes
CompatibilityWindows, Linux, Mac, Android Windows, Linux, Mac, Android Windows, Linux Windows, Linux, Mac, Android
Baud Rate SupportUp to 921,600 baud Up to 460,800 baud Up to 460,800 baud Up to 921,600 baud
Hardware Flow ControlYes No No Yes
Plug and PlayYes No No No
Ease of SetupNo drivers required Requires TCP or UDP client software Requires driver installation Requires TCP client software
Serial Application CompatibilityYes (ready-to-use serial terminal tools or custom software) No Yes No
Secure Wireless Data TransferYes No Not applicable Yes
Electrical Isolation from HostYes Yes No Yes
Open SourceHW+SW No No No
Comes with EnclosureYes No No No

Support & Documentation

WiSer is a fully open source project. We’ve published all of our design files, source code, and documentation on GitHub so you can inspect its inner workings. Our goal is to empower users, making it easy to program, understand, customize, and troubleshoot WiSer. Meanwhile, if you have any questions, you can reach out using the appropriate Ask a question link below.

Manufacturing Plan

Our final prototypes have been manufactured and validated, and we’ve received quotes from product houses and part suppliers. Conversations with suppliers are underway to secure components based on the orders we receive in the early stage of the campaign. We’ve also developed a production test tool that loads firmware onto WiSer devices and pairs them in a single go. Stay tuned for regular campaign updates so you can follow our progress!

Fulfillment & Logistics

WiSer will be produced and assembled by our contract manufacturer in India. QA testing and kitting will be handled at Bitmerse LLP in Ahmedabad, Gujarat, India. After packing and labeling the various WiSer kits, we will send them to Crowd Supply for fulfillment through their logistics partner, Mouser Electronics. For details on ordering, payment, and shipping, check out this useful guide.

Risks & Challenges

Launching any new product involves risks, but we’ve taken steps at every stage of development to minimize those risks and maximize the likelihood of on-time fulfillment. Among other mitigations, we have already identified partners for PCB fabrication and enclosure manufacturing and developed an automated testing tool capable of programming and configuring WiSer. If we encounter unexpected issues or delays, we will be sure to let you know—and explain how we are working to address them—in a detailed campaign update. We are committed to transparency and will keep you informed every step of the way.

In the Press


"WiSer is a completely open source open hardware project based on a very well-known ESP32-S2 system on chip so it's going to be very very hackable."

Linux Gizmos

"[T]he key strength of WiSer lies in its ease of use. It has been designed to replace cumbersome USB cables, unreliable Wi-Fi routers, and complex Bluetooth setups."

CNX Software

" like a typical USB to TTL debug board except it operates over WiFi, and it’s especially useful to debug code, update firmware, log data, or transfer files without a USB cable or even a Wi-Fi router since the connection is peer-to-peer."


"It immediately started working perfectly with no cables, and I started doing that magician’s-trick-style waving of arms to demonstrate to myself that there were no strings attached!"

Ask a Question

Produced by Bitmerse LLP in Ahmedabad, India.

Sold and shipped by Crowd Supply.

Host-to-Client WiSer Kit

Includes one WiSer-USB, one WiSer-TTL, a USB Type-C cable, and jumper cables. Both WiSer devices come with enclosures, and WiSer-TTL has mounted header pins. Suitable for connecting to a target device using jumper cables.

$70 $8 US Shipping / $18 Worldwide

Host-to-Host WiSer Kit

Includes two WiSer-USB devices with enclosures. Suitable for communication between two host systems.

$65 $8 US Shipping / $18 Worldwide

About the Team

Bitmerse LLP

Ahmedabad, India  ·   BitmerseLLP  ·   bitmerse  ·

We offer comprehensive product engineering solutions with a global reach.

Jaydeep Dhrangdhariya
Dhrumil Doshi

See Also

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