Open-Source EMR Pen Tablet Hardware Implementation and Documentation

Patchouli is an open-source electro-magnetic drawing tablet hardware implementation, including a coil array, an RF front end built using commercially available parts, and digital signal processing algorithms. The design is compatible with most commercial pens from different vendors, offering an ultra-low-latency pen input experience for your customized hardware projects.

In addition, this project aims to provide a comprehensive documentation of the EMR technology, including the mechanism, circuit implementation, signal processing algorithms, and the pen protocol of different product lines from different vendors.

Project Code / Hardware Repository: GitLab

Updates

Maintainers

This project is sponsored by the NLnet Foundation NGI Zero Core Fund. Learn more about it here: Project Patchouli

License

Project Patchouli Documentation by Yukidama and other project members is licensed under Creative Commons Attribution 4.0 International

All images and other resource files in this project, unless otherwise specified, are created by the project team and are licensed under the same CC BY 4.0 license.

The hardware design is released under the CERN Open Source Hardware License strongly-reciprocal variant, CERN-OHL-S. A copy of the license is provided in the source repository. Additionally, a user guide of the license is provided on ohwr.org.

All program code, unless otherwise specified, is licensed under the GPLv3 license.