Walter is now fully available for purchase! With CE and FCC certifications (2BDGUWALTER), it’s ready to help businesses and developers build connected devices with ease. Experience ultimate flexibility and reduced product certification costs.

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Open Source

The Walter module schematics are available under the GPLv3 license.

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CE and FCC Certified

The Walter module comes with CE and FCC certifications, streamlining your time to market. FCC ID: 2BDGUWALTER

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Ultimate Flexibility

All I/O pins are accessible, offering maximum layout flexibility.

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Multiple Programming Languages

Program the module using Arduino IDE, Micropython, JavaScript, or the Espressif IDF.

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Supports WiFi/BLE/5G/GPS

Walter’s ESP32-S3 provides WiFi and BLE connectivity, while the Sequans modem supports NB-IoT, LTE-M, and GPS.

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Designed and Built in the EU

The module is designed and manufactured in the European Union, ensuring long-term availability.

Small form factor and flexible IO pins

Although Walter has a powerful processor and many wireless technologies aboard, the module has a very small form factor of only 55mm x 24.8mm.

The ESP32-S3 microcontroller allows any peripheral to be routed to any IO pin. On top of that no exposed IO pins are strapping pins, this means you have the freedom to layout your Walter based board as you wish.

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Good hardware needs good software

  • You can start programming fast prototypes because the ESP32-S3 has an Arduino core. We are currently working on a custom and open source NB-IoT, LTE-M and GPS library for Walter's Arduino environment.
  • MicroPython is gaining traction and is getting mature. We are dedicated of supporting MicroPython on Walter by actively contributing to the generic ESP32 MicroPython project.
  • Some projects require tight hardware control, the ESP-IDF toolchain gives you exactly that. Given that Walter's schematics are open source, you are in the driver's seat.
  • When there is sufficient interest we are willing to investigate in getting JavaScript support with Espruino.

Built for low power

The board uses an ultra high efficiency DC-DC converter for optimal power performance. Walter consumes only 9.8µA of power in deep sleep while the modem is in PSM mode.

Besides the various low power and deep sleep modes of both the ESP32-S3 processor and GM02SP modem, Walter has a mosFET switched and software controllable peripheral power pin. This allows you to completely remove power to attached devices, such as sensors, when you don't need them.

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Walter Feels: open source carrier board

  • Wide input range (2.5-26V) with MPPT power input and multi-chemistry battery charging (LiFePO4, Li-Ion, Lead-Acid) for versatile power options.
  • Built-in sensors for temperature, humidity, barometric pressure, 6 DoF IMU, with connectors for external sensors like the Sensirion SCD30 CO₂ sensor.
  • Multiple interfaces, including RS232, RS485, SDI-12, CAN bus, with 3.3V, 5V, and 12V outputs for flexible connectivity.
  • I²C battery and power management, MicroSD card support, and GPIO pins, all compatible with Takachi PFF13-4-13W housing for easy integration.
24

GPIO pins

4

Wireless technologies

1

GNSS receiver

4

Supported toolchains

2

CPU cores

Friends from Walter

Dora Terjek

Olivier Bloch

"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!"

Podcast : Olivier's Iot Home Show Soracom Logo
Simon Kemper

Simon Kemper

"Where is #Walter? He is finally here. I backed the DPTechnics bv Walter on #CrowdSupply and received my units last week. It is an #ESP32-S3 powered #cellular development kit with a Sequans Communications NB-IoT modem and SIM slot. I connected it today 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 but amazing #Pycom GPy. But besides #Python, you can also use #Arduino to program this device, which I did. It works super great. Stay tuned for a template that we will deliver soon. #IoT #IIoT #nbiot #5g"

LinkedIn Contribution : Where is #Walter? DataCake
Dora Terjek

ESPBoards.dev

"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."

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Thomas Lanier

Thomas Lanier

"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!"

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Jason Segarra

Jason Segarra

"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."

Blogpost : Make the Most of Your ESP32-S3 Walter with Soracom Connectivity Soracom Logo
Dora Terjek

Dora Terjek

"The Walter Board from DP Technics is the developer's new best friend."

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Pricing

The below prices are MSRP prices for 1 piece, please contact use for volume pricing.

WALTER MODULE
59
without VAT

The bare module packaged in an antistatic bag

  • Walter module
  • Community support
WALTER FEELS
125
without VAT

The reference carrier board, the basis for your IoT gateway

  • Walter Feels carrier board
  • CO2 sensor not included
  • Community support
WALTER DEVKIT
250
without VAT

Rocket launch your product design with the Walter devkit

  • Walter module
  • Taoglas LTE Antenna
  • Taoglas GPS Antenna
  • Two USB-C cables
  • 250Mb/1Y Soracom SIM card
  • 30 min engineering support
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We are curious to see what you will build with Walter and discover the wide range of possibilities. Subscribe on the newsletter to get notified on the latest developments.

Order now Keep me posted