A globally certified ESP32-S3 multi-radio IoT module with LTE-M, NB-IoT, WiFi, BLE and GNSS. Reduce development risk, certification cost, and time to market.
Walter makes custom multi-radio IoT products accessible to any team, even a team of one.
Trusted by teams around the world, and many more
Skip the certification lab. Walter ships pre-certified for 5 regions, so you go straight from prototype to product. FCC ID: 2BDGUWALTER
LTE-M, NB-IoT, WiFi, BLE and GNSS, all in 55 x 24.8mm. The connectivity you need, without the integration headache.
No exposed strapping pins means complete freedom in your PCB layout. All I/O accessible, all peripherals routable.
Arduino, MicroPython, Espressif IDF, or Zephyr. Start fast with Arduino, go deep with IDF. Walter doesn't lock you in.
Schematics under GPLv3, full transparency, no black boxes.
Designed and manufactured in the European Union. No surprise end-of-life notices, no supply chain uncertainty.
Watch how Walter takes you from prototype to certified product in record time.
We promise we won't spam you with daily mail. You will be kept up-to-date about our upcoming crowdfunding campaign, hardware and software updates.
Walter is present on the Embedded World 2023 fair in Nuremberg, Germany, from 14 - 16 March. You can find us in hall 3 booth 3-539. Enter your name and email to receive a free ticket within 48h. See you at the fair!
Despite packing an ESP32-S3, a Sequans GM02SP modem, and five wireless technologies into a single module, Walter's footprint is just 55mm x 24.8mm, small enough to fit into almost any enclosure.
The ESP32-S3 allows any peripheral to be routed to any IO pin. No exposed strapping pins means you have complete freedom to layout your Walter-based board exactly as your design requires.
Walter uses an ultra high efficiency DC-DC converter for optimal power performance. With the ESP32-S3 in deep sleep and the GM02SP modem in PSM mode, total current draw is just 9.8µA, low enough to enable energy harvesting applications powered by solar, vibration, or thermal sources.
A MOSFET-switched, software-controllable peripheral power pin lets you completely cut power to attached sensors and devices when they are not needed, squeezing every last microamp out of your battery budget.
GPIO pins
Wireless technologies
µA deep sleep
Supported toolchains
CPU cores
"Cellular is gaining in popularity thanks to NB-IoT and LTE-M making it possible to leverage existing, secure infrastructure already deployed worldwide by operators, but adding cellular connectivity to an embedded design can be tedious and long, unless there was a module offering an almost plug and play solution… Introducing Walter!"
I connected it using a 1NCE SIM and 1NCE OS to Datacake and I can send and receive data. It also serves as a pin-compatible replacement for the discontinued Pycom GPy. Besides Python, you can also use Arduino to program this device. It works super great.
"What sets Walter apart is its inclusion of the Sequans GM02SP modem, offering LTE-M and NB-IoT 5G connectivity for low-power, wide-area communication, ideal for IoT applications. The modem also integrates a GNSS receiver, adding precise positioning capabilities for tasks like asset tracking, navigation, or geolocation."
"We have converted our GPy application over to Walter with good results.
Key points include:
Our hardware design has not changed. The Walter was a plug-in replacement for the GPy.
Minor changes to the code were required due to different pin assignments.
One great improvement with Walter is the ability to reset the modem from the software
directly.
Another great feature is that we can now run the latest version of MicroPython unchanged with Walter
(a fork is not required).
Thanks for the great work!"
"The ESP32-S3 Walter is a low-cost, low-power microcontroller with integrated WiFi and Bluetooth 5 (LE) capabilities. Its unique architecture affords Walter an array of wireless connectivity options – including Cat-M1 (LTE-M), GNSS, and NB-IoT – all within a compact device that can easily accommodate virtually any use case."
The below prices are MSRP prices for 1 piece. For volume pricing, contact us at info@quickspot.io.
The bare module, ready to integrate into your own design
The reference carrier board, the basis for your IoT gateway
Everything you need to kickstart your IoT product development
Custom off-the-shelf cellular IoT, built by your team, shipped worldwide. Walter makes it possible. Ready to get started?
Order now Keep me posted
