Protective Stop

Open Source Safety Consortium

OSHWA UID

Certification Date

August 27, 2026

Country

United States of America

A low-cost wireless protective stop for robots and automation. A PoE- or USB-powered ESP32-S3 remote reads a physical E-stop switch through two independent per-core channels running in lockstep, and heartbeats operator intent at 10 Hz over an encrypted tunnel to a machine-side process that brings the robot to a controlled stop if the heartbeats say STOP or stop arriving. Every failure mode degrades to "no message," which stops the machine. Includes enclosure, firmware, and a ROS 2 machine node.

Version

v1.2

Licenses

Hardware

CERN-OHL-P-2.0

Software

Apache

Documentation

CC-BY-4.0

View Documentation

Certification mark

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Project Type

Robotics

Electronics

Keywords

protective stop, robot safety, ESP32, ROS 2, teleoperation