---
lang: "en"
title: "RAK6421 WisBlock HAT for Raspberry Pi"
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---

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RAK6421: Modular HAT for Raspberry Pi for WisBlock Sensor Integration

RAK6421 is a powerful Raspberry Pi HAT that allows you to connect WisBlock modules directly to any Pi (Pi 4, Pi 5, or Pi Zero 2W). Whether you're building a Meshtastic router, a sensor gateway, or a LoRa test platform, the RAK6421 facilitates the integration of LoRa radios, GPS, environmental sensors, and more, all in a modular, plug-and-play fashion. The RAK6421 complies with the HAT+ specification by using an independent EEPROM for metadata and device tree information.

With the RAK6421, you can transform your Raspberry Pi into a powerful IoT hub. It allows you to connect virtually any WisBlock sensor or interface module, from LoRa radios to GPS and environmental sensors, directly to your Pi. No additional baseboard is needed. Ideal for rapid prototyping, smart monitoring, or building a compact Meshtastic node.

Key benefits of the RAK6421 Pi HAT include:

- Instant connection of WisBlock modules: no need for a separate WisBlock baseboard.
- Support for sensors, radios, and GPS: easily create LoRa-based or sensor applications.
- An excellent Pi HAT for IoT and Meshtastic: ideal for long-range communications and logging.
- Compact and plug-and-play: clean setup, quick integration, and no soldering required.
- HAT+ specification compliant: an integrated EEPROM can store metadata and the device tree, allowing the operating system to automatically detect installed hardware modules and load necessary drivers.

## Technical Specifications

- Standard Raspberry Pi 40-pin connector
- Two (2) WisBlock IO slots
- Four (4) WisBlock Sensor slots
- Supports LoRa radios, I2C sensors, GPS, I2S audio
- Integrated I2C ADC for analog inputs (e.g., temperature, light)
- Powers modules via 3.3V and VBAT from the Pi's 5V line
- Compatible with RAK13300 and RAK13302 LoRa radios
- Additional options: Raspberry Pi, enclosure, and sensor bundle
- Onboard EEPROM connected to ID_SD and ID_SC signals
- Dimensions: approximately 70 mm x 60 mm

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Source: https://shop.marcomweb.it/en/wishat/rak6421-wisblock-hat-for-raspberry-pi

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