> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# Walter - LTE-M/NB-IOT Development Module

**Type:** Product page · **SKU:** CE10231 · **Brand:** [DPTechnics](https://core-electronics.com.au/brands/dptechnics-australia)
**Page:** https://core-electronics.com.au/dptechnics-walter-nb-iot-lte-m-development-board.html ([markdown](https://core-electronics.com.au/dptechnics-walter-nb-iot-lte-m-development-board.html.md))

A fully certified and connectivity-enabled development board that will take projects from the prototyping to the production phase.

## Pricing

- **Price:** $120.85 (inc GST) — $109.86 AUD, exc GST
- **Quantity discounts:** 5+ $106.56 (exc GST) · 10+ $104.37 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 40 today; more stock is typically available with a 10–22 day lead time.

## How to buy

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- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

Walter is a compact IoT system-on-module (SoM) that integrates the power of the industry-respected ESP32-S3 microcontroller with a state-of-the-art Sequans GM02SP LTE-M/NB-IoT 5G modem and GNSS receiver. Designed to deliver versatile wireless connectivity, the Walter supports Wi-Fi b/g/n, Bluetooth 5, and cellular communication in a tiny 24.8 x 55 mm footprint- ideal for any IoT project like, sensing, tracking, and control applications, where space and power efficiency matter.

### Technical Specifications

- **Microcontroller:** ESP32-S3-WROOM-1-N16R2, dual-core 32-bit LX7 CPU, with 16 MiB quad SPI flash, 2 MiB quad SPI PSRAM
- **Wireless Connectivity:**
    - Wi-Fi 802.11 b/g/n (150 Mbps) with onboard PCB antenna
    - Bluetooth 5 Low Energy (2 Mbps) with onboard PCB antenna
    - Sequans GM02SP modem: 
        - Dual-mode LTE-M / NB-IoT (NB1, NB2), compliant with 3GPP LTE Release 14 - [antenna required](https://core-electronics.com.au/lte-wide-band-flex-antenna-600mhz-6000mhz.html)
        - GNSS receiver supporting GPS and Galileo constellations with LNA + SAW filter - [passive U.FL antenna required](https://core-electronics.com.au/passive-gps-antenna-ufl-15mm-x-15mm-1-dbi-gain.html) (Officially supported antenna coming soon)
- **Interfaces and I/O:** 24 GPIO pins; UART, SPI, I²C, CAN, I²S, SD available on any GPIO; ADC, DAC, PWM integrated; USB Type-C for programming and debugging; reset button
- **Power Supply:** 5.0 V via USB Type-C; 3.0–5.5 V via Vin pin (not to be used simultaneously); ultra-low quiescent current design
- **Power Consumption:** Deep sleep current 9.8 µA total (8 µA ESP32-S3, 1 µA GM02SP, 0.8 µA DC-DC & LDO)
- **Size and Form Factor:** 24.8 x 55 mm, 2.54 mm pin headers, breadboard friendly, pin- and footprint-compatible with former PyCom GPy module
- **Certifications:** CE, UKCA, FCC, IC, RCM
- **Industrial temperature range:** -40°C to +85°C
- **Software Ecosystem:** Supported by ESP-IDF, Arduino, MicroPython, Toit; open-source libraries with transparent protocol offloading, robust error handling, and low-power optimisations
 
### Compatibility

- Use the [Walter Feels](https://core-electronics.com.au/dptechnics-walter-feels-carrier-board-for-walter.html) carrier board to break out industry-standard protocols, and all of the features needed to accelerate development and deployment
- Develop on a breadboard using traditional methods
- Drop-in replacement for the former Pycom GPy
 
### Pinout Diagram

![Walter Feels pinout diagram](https://www.crowdsupply.com/img/4272/cf0f5494-19ce-4688-b925-efde1b514272/walter-pinout-01.svg)

### Additional Resources

- [Walter schematic (PDF)](https://github.com/QuickSpot/walter-hardware/blob/main/walter/schematic/schematic-v1.6.pdf)
- [KiCAD footprint files](https://github.com/QuickSpot/walter-hardware/tree/main/walter/footprint)
- [Walter datasheet (PDF)](https://core-electronics.com.au/attachments/localcontent/walter_datasheet_68748c82db4.pdf)
- [Open-source libraries and firmware on GitHub](https://github.com/QuickSpot)
- [Comprehensive documentation](https://github.com/QuickSpot/walter-documentation)
- [Certification test reports (FCC)](https://fccid.io/2BDGUWALTER)
 
### What’s Included

- Walter system-on-module with ESP32-S3 and Sequans GM02SP modem

## Guides for this product

- [Getting Started With Walter \| An ESP32 With 4G/5G and GPS!](https://core-electronics.com.au/guides/wireless/getting-started-with-walter-an-esp32-with-4g-5g-and-gps/)

## Videos for this product

- [Getting Started With Walter \| An ESP32 With 4G/5G and GPS!](https://core-electronics.com.au/videos/getting-started-with-walter-an-esp32-with-4g5g-and-gps)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/c/e/ce10231-walter-module.jpg)