Raspberry Pi Industrial Monitoring
Modbus TCP / RTU + Siemens S7 + MQTT industrial monitoring on a Raspberry Pi. Edge PID, HACCP-grade compliance reports, browser dashboard — sits alongside your existing PLCs and SCADA without an integrator quote.
Scope: monitoring + slow-loop control, not hard real-time
LoopString runs on Linux on a Pi. We're great at second-scale monitoring and slow control loops — temperature, humidity, CO₂, pressure, motor on/off. We are NOT a hard-real-time safety controller. Keep PLCs in their job (interlocks, e-stops, sub-100ms control) and use LoopString as the monitoring + alarming + dashboard + compliance layer on top.
Industrial protocols
Modbus TCP
Ethernet Modbus for modern PLCs, soft starters, VFDs, energy meters
First-class part library entry — drop in the IP + slave ID + register and the Configurator reads it.
Modbus RTU (RS485)
Serial Modbus for legacy PLCs + industrial controllers
USB-to-RS485 adapter on the Pi; first-class library entry.
Siemens S7
S7-1200 / S7-1500 PLCs via Snap7 driver
Read/write DB blocks via snap7-py on the Pi.
MQTT (incl. Sparkplug B)
Pub/sub bridges from existing OT brokers + edge gateways
mosquitto local broker on the Pi + Configurator subscribes.
HTTP / REST
Modern PLCs + custom industrial gateways exposing JSON
Function nodes call arbitrary REST APIs from the Pi.
OPC-UA
(Roadmap) — first-class OPC-UA part library entry
On the integration roadmap; contact founders@loopstring.io if it gates a deal.
Industrial use cases we cover
Each links to a dedicated landing with sensors, automation, and compliance details.
Cold storage
Walk-in cooler + freezer + blast chiller continuous-record monitoring.
See the use case →Dairy processing
HTST / vat pasteurization + cold-chain with PMO + FSMA compliance.
See the use case →HVAC fleets
Multi-zone setpoint sync, fleet alarms, duty-cycle tracking.
See the use case →Cheese cave aging
Affinage T/RH/CO₂ control over months-long aging cycles.
See the use case →Wine making
Tank ferment + MLF + barrel-room + bottle storage monitoring.
See the use case →Brewing
Fermentation tank PID + mash schedules + batch automation.
See the use case →
Key Takeaways
- Modbus TCP / RTU and Siemens S7 are first-class parts in the library — wire a Pi alongside existing PLCs.
- Edge-PID loops + alerts + duty-cycle tracking run on the Pi locally — process monitoring survives ISP outages.
- HACCP / FDA / USDA-grade PDF compliance reports + tamper-resistant activity log out of the box.
- Cloud dashboard with Tailscale tunnel — no DMZ engineering, no SSL certs, no port-forwarding.
- Sits alongside Ignition / SCADA installs as a lightweight monitoring + dashboard layer.
How we compare to traditional industrial tooling
vs Traditional SCADA
Pi + per-device SaaS instead of server + tag-licensed clients.
See the comparison →vs Ignition
Browser Configurator vs Gateway server + Designer + Vision.
See the comparison →vs PLC integrator
Replace the $20k–$80k integrator project.
See the comparison →vs Sensaphone
No vendor controller — your Pi + commodity sensors.
See the comparison →Ready to wire a Pi into your line?
Start free — no integrator engagement required.