# 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.

## 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)