Want to see whether a machine is running, idle or in alarm without walking the shop floor? I build a live monitoring system with ESP32, MQTT and Node-RED.

What's included:

ESP32 firmware reading machine signals (read-only, isolated input)

MQTT broker and a Node-RED live dashboard

Run / idle / alarm status with time counters and downtime history

Telegram alerts and an optional production counter display

Wiring diagram, parts list, source code and setup notes

Works with CNC machines, presses, injection molding and tower lights. I never modify machine controllers or safety circuits.