Configurator
Build and deploy custom automation flows
PID Controllers
Learn how PID controllers work, when to use them, and how to configure and tune Heat/Cool PID, Humidity PID, CO₂ Ventilation PID, and 3-Stage Cooling in the LoopString Configurator.
Configurator Overview
Learn what the Configurator is, how to build your first automation flow, configuration options, real-world use cases, and troubleshooting tips.
Environmental Sensors
Complete guide to humidity, CO2, light, pressure, and UV sensors in the LoopString Configurator — wiring, configuration, and real-world use cases for grow rooms, fermentation, and more.
Setup Wizard
Step-by-step guide to the Configurator Setup Wizard — the fastest way to go from a blank project to a fully wired, ready-to-deploy IoT configuration.
Adding Rooms and Parts
Organize your IoT setup into rooms and add sensors, actuators, and controllers from the parts library.
Actuators — Relays, Smart Plugs, Servos, Dosing Pumps, and Sequent HATs
Complete guide to actuator parts in the LoopString Configurator: GPIO relay modules, Kasa smart plugs, SG90 servo motors, PWM dosing pumps, solenoid valves, and Sequent Microsystems HATs. Includes critical guidance on matching actuator types to the correct controller.
Flow Editor
Build automation logic visually by wiring sensors, controllers, and actuators together on the Flow Editor canvas. Understand the three-column layout, typed ports, auto-wiring, and room management.
Brewing & Industrial Actuators — Heaters, Chillers, Mixers, Linear Actuators, Level Sensors
Documentation for brewing and industrial actuator parts — relay-driven heaters, glycol chillers, mixer/agitators, linear actuators, and capacitive level sensors for multi-stage brewing, food production, and industrial process control.
Hysteresis Controllers
Learn when to use hysteresis (bang-bang) controllers instead of PID, how to configure deadband and setpoint settings, and how the HVAC controller's minimum run time protects compressors from short-cycling damage.
Generic & System Sensors
Use the Generic Programmable Analog Sensor to connect any 4-20mA or voltage transmitter with custom range mapping and calibration. Use Pi Native System Signals to monitor CPU temperature, memory, disk, and uptime directly from the Pi.
PWM Duty Cycle Adapter
Understand when and how to use the PWM Duty Cycle Adapter to convert a PID controller's 0–1 output into a timed on/off signal for relay-controlled actuators that need proportional behavior.
Timers & Scheduling
Learn how to add time-based automation to your Configurator flows — delay messages, throttle sensor rates, fire on cron schedules, count down to actuator actions, and gate signals by time of day.
Using Templates
LoopString includes 25 pre-built project templates covering agriculture, food and beverage, manufacturing, and facilities use cases. Learn how to load a template, what each template includes, and how to customize one for your specific hardware.
Deploying to Pi — Deploy, Versioning & Drafts
Deploy your Configurator flow to a Raspberry Pi, monitor deployment progress, understand the FlowSyncBadge, manage flow versions and rollback, and work with auto-saved drafts.
Multi-Device Setups
Configure and manage multiple Raspberry Pi devices with coordinated automation and fleet overview.
Temperature Sensors
A guide to all temperature sensor parts in the LoopString Configurator: DS18B20, DHT22, SHT31, BME680, PT100 RTD, and MAX31855. Learn which sensor fits your application and how to configure each one.
Liquid & Chemical Sensors
How to add and configure liquid and chemical sensors in the Configurator — Atlas Scientific EZO pH, conductivity, ORP, and dissolved oxygen probes, plus the iSpindel wireless fermentation hydrometer.
Protocol Bridges (MQTT, Modbus, S7comm)
Connect third-party hardware — ESP32, Arduino, PLCs, industrial sensors — to LoopString using MQTT, Modbus RTU, Modbus TCP, or Siemens S7comm protocol bridges on the Raspberry Pi gateway.
WiFi Devices & Fermentation Hydrometers
Connect WiFi microcontrollers and wireless fermentation hydrometers to LoopString — iSpindel MQTT gravity/temp/ABV% tracking, Tilt BLE hydrometer, and D1 Mini ESP8266/ESP32 generic WiFi sensor bridge.
Phase 2 Sensors — SCD40, AS7341, MAX31855, SG90, EZO-ORP, Dosing Pump, VEML6075
Documentation for Phase 2 community-driven sensor and actuator parts — CO₂ sensing (SCD40), spectral light (AS7341), thermocouple temperature (MAX31855), micro servo (SG90), ORP water quality (EZO-ORP), PWM dosing pump, and UV index (VEML6075).
Multi-Pi Mesh Networking
Link multiple Raspberry Pi devices into a coordinated mesh — assign primary and secondary roles, scope rooms to each Pi, and let the platform keep every node in sync automatically.
Signal Grouping and Control Loops
Organize parts into logical control loops with drag-to-reorder grouping, split and merge loops, and automatic wiring within loop boundaries.
Room Assignments in the Configurator
Assign control loops to rooms during configuration, with bidirectional sync between the Configure step and Flow Maps.
USB Sensor Hubs
Connect multi-sensor USB hubs to your Pi with automatic detection via the manifest protocol and peripheral scan integration.