¶ ZECTRIX Documentation & Developer Wiki

Official product documentation, developer guides, firmware references, cloud APIs, and community resources for ZECTRIX e-paper hardware.

Choose the correct device before you begin: NOTE4 is a ready-to-use black-and-white AI e-paper product. NOTE4 DevKit is the monochrome ESP32-S3 development platform. NOTE4C DevKit is the four-color development platform. Their display drivers and firmware images are not interchangeable.

Looking for products rather than documentation? Visit the ZECTRIX official website or compare all ZECTRIX products.

¶ Choose Your Path

¶ I use ZECTRIX NOTE4

Set up and use the ready-to-use NOTE4 product with its official firmware and Zectrix Cloud services.

• View NOTE4 on the official website
• Join the NOTE4 waitlist
• NOTE4 Hardware Specifications
• Official NOTE4 Firmware Upgrade
• NOTE4 Feature Guide

¶ I develop with NOTE4 DevKit

Build custom firmware and applications for the monochrome 4.2-inch 400 × 300 ESP32-S3 e-paper platform.

• View NOTE4 DevKit on the official website
• Buy NOTE4 DevKit from the official ZECTRIX store
• NOTE4 Developer Kit Development Guide
• ESP32-S3 E-Paper: Partial Refresh & 16-Level Grayscale
• Software Open-Source Resources and Roadmap

¶ I develop with NOTE4C DevKit

Work with the black, white, red, and yellow four-color e-paper development platform.

• View NOTE4C DevKit on the official website
• Buy NOTE4C DevKit from the official ZECTRIX store
• NOTE4C DevKit Development Guide
• NOTE4C Hardware Specifications
• Community Firmware

¶ I integrate with Zectrix Cloud

Connect devices, to-dos, display content, and other services through the Zectrix Cloud API.

• Zectrix Cloud API Documentation
• Official NOTE4 Firmware Upgrade

¶ Featured Technical Guides

¶ ESP32-S3 E-Paper: Partial Refresh & 16-Level Grayscale

Learn how to build and flash the open NOTE4 DevKit reference project, prepare 1bpp and 4bpp images, use full and partial refresh, and switch safely between black-and-white and grayscale display modes.

Read the ESP32-S3 e-paper guide

¶ Developer Kit References

• NOTE4 DevKit hardware, pin map, flashing, and ESP-IDF development
• NOTE4C DevKit hardware, four-color display, flashing, and ESP-IDF development
• Open-source scope, available resources, and roadmap

¶ Community & Open Source

• Apps & Plugins — desktop clients, synchronization tools, automations, and dashboards.
• Custom Firmware — independent firmware projects for NOTE4 and NOTE4C hardware.
• Cases & Stands — community-made 3D-printable enclosures and accessories.

Community projects are maintained independently. Review each project's hardware scope, firmware target, and recovery instructions before installing it.

¶ Support

• Frequently Asked Questions
• Feature Guide
• Software Release Notes

¶ Before Flashing or Upgrading

1. Confirm whether the device is NOTE4, NOTE4 DevKit, or NOTE4C DevKit.
2. Verify that the firmware image matches the display hardware and board revision.
3. Preserve the appropriate recovery files and back up important configuration when possible.
4. Use the official NOTE4 firmware page only for NOTE4 devices running the commercial firmware.