--- title: Example Apps description: Blues provides a variety of open source example applications, code snippets, and best practices to help you build your connected product. source_url: https://dev.blues.io/example-apps/ canonical_url: https://dev.blues.io/example-apps/ markdown_url: https://dev.blues.io/example-apps.md --- # Example Apps Open source code samples and full reference solutions to help you build with Notecard and Notehub. ## [Samples](https://dev.blues.io/example-apps/samples.md) Purpose-built applications that address specific capabilities of the Notecard and Notehub. ### [Building a Simple Asset Tracker](https://dev.blues.io/example-apps/samples/building-a-simple-asset-tracker.md) [Build a compact, self-contained asset tracker using the Notecard Cell+WiFi's built-in GNSS module and the Notecarrier CX's onboard Cygnet MCU.](https://dev.blues.io/example-apps/samples/building-a-simple-asset-tracker.md) [View Sample](https://dev.blues.io/example-apps/samples/building-a-simple-asset-tracker.md) ### [Building Edge AI Applications](https://dev.blues.io/example-apps/samples/building-edge-ai-applications.md) [Learn how to build an Edge AI application using Blues Swan, Notecard, and Edge Impulse.](https://dev.blues.io/example-apps/samples/building-edge-ai-applications.md) [View Sample](https://dev.blues.io/example-apps/samples/building-edge-ai-applications.md) ### [Continuous Asset Tracking with External GPS and Immediate Location Sync](https://dev.blues.io/example-apps/samples/continuous-asset-tracking-with-external-gps-and-immediate-location-sync.md) [Learn how to build an asset tracking solution with Blues Notecard and Cellular IoT that provides continuous location updates to the cloud.](https://dev.blues.io/example-apps/samples/continuous-asset-tracking-with-external-gps-and-immediate-location-sync.md) [View Sample](https://dev.blues.io/example-apps/samples/continuous-asset-tracking-with-external-gps-and-immediate-location-sync.md) ### [Controlling Device State and Receiving Acknowledgment](https://dev.blues.io/example-apps/samples/controlling-device-state-and-receiving-acknowledgment.md) [This sample app shows how to control device state from a web app using DB Notefiles, and how the device acknowledges changes by reporting the state it actually has.](https://dev.blues.io/example-apps/samples/controlling-device-state-and-receiving-acknowledgment.md) [View Sample](https://dev.blues.io/example-apps/samples/controlling-device-state-and-receiving-acknowledgment.md) ### [Managing a Notecard's WiFi Network Remotely](https://dev.blues.io/example-apps/samples/managing-a-notecards-wifi-network-remotely.md) [This sample app shows how to remotely manage a Notecard's WiFi connection using the Notehub API and Notehub SDKs.](https://dev.blues.io/example-apps/samples/managing-a-notecards-wifi-network-remotely.md) [View Sample](https://dev.blues.io/example-apps/samples/managing-a-notecards-wifi-network-remotely.md) ### [Putting a Host to Sleep Between Sensor Readings](https://dev.blues.io/example-apps/samples/putting-a-host-to-sleep-between-sensor-readings.md) [A sample app that periodically takes sensor readings, and uses the Notecard to put a host MCU to sleep for a set period between readings](https://dev.blues.io/example-apps/samples/putting-a-host-to-sleep-between-sensor-readings.md) [View Sample](https://dev.blues.io/example-apps/samples/putting-a-host-to-sleep-between-sensor-readings.md) ### [Routing Data from Notehub to a Custom Cloud Endpoint](https://dev.blues.io/example-apps/samples/routing-data-from-notehub-to-a-custom-cloud-endpoint.md) [Learn how to write a cloud service that receives data from a Notehub route, using a variety of popular backend languages and frameworks.](https://dev.blues.io/example-apps/samples/routing-data-from-notehub-to-a-custom-cloud-endpoint.md) [View Sample](https://dev.blues.io/example-apps/samples/routing-data-from-notehub-to-a-custom-cloud-endpoint.md) ### [Using LEDs and NeoPixels to Monitor Notecard Status](https://dev.blues.io/example-apps/samples/using-leds-and-neopixels-to-monitor-notecard-status.md) [This sample app shows how to integrate monochromatic LEDs, RGB LEDs, and NeoPixels to monitor your Notecard-based product.](https://dev.blues.io/example-apps/samples/using-leds-and-neopixels-to-monitor-notecard-status.md) [View Sample](https://dev.blues.io/example-apps/samples/using-leds-and-neopixels-to-monitor-notecard-status.md) ## [Accelerators](https://dev.blues.io/example-apps/accelerators/) Fully documented open source reference applications for assembling Notecard- and Notehub-powered solutions. ### [Asset Location Tracking](https://dev.blues.io/example-apps/accelerators/use-case/asset-location-tracking/) ### [Heavy Equipment Hours-of-Use & Utilization Tracker](https://dev.blues.io/example-apps/accelerators/heavy-equipment-hours-of-use-utilization-tracker/) [A retrofit for mobile heavy equipment that uses a magnetically mounted, solar-trickle-charged enclosure to detect engine on/off transitions via vibration, accumulating a software hour meter and reporting over cellular or satellite.](https://dev.blues.io/example-apps/accelerators/heavy-equipment-hours-of-use-utilization-tracker/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/heavy-equipment-hours-of-use-utilization-tracker/) ### [Returnable Container / Tote Pool Tracker](https://dev.blues.io/example-apps/accelerators/returnable-container-and-tote-pool-tracker/) [A cellular asset tracking solution for reusable container pools—totes, kegs, and cylinders—that reports location on motion events and daily heartbeats using the Notecard's built-in accelerometer.](https://dev.blues.io/example-apps/accelerators/returnable-container-and-tote-pool-tracker/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/returnable-container-and-tote-pool-tracker/) ### [Untethered Trailer and Chassis Fleet Tracker](https://dev.blues.io/example-apps/accelerators/untethered-trailer-and-chassis-fleet-tracker/) [A solar-trickle-charged, tractor-independent GPS tracker for freight trailers and intermodal chassis, with cellular-first telemetry and Iridium LEO satellite fallback for global coverage.](https://dev.blues.io/example-apps/accelerators/untethered-trailer-and-chassis-fleet-tracker/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/untethered-trailer-and-chassis-fleet-tracker/) ### [Asset Performance Optimization](https://dev.blues.io/example-apps/accelerators/use-case/asset-performance-optimization/) ### [Legacy Diesel Generator Fleet Performance Uplift](https://dev.blues.io/example-apps/accelerators/legacy-diesel-generator-fleet-performance-uplift/) [A cellular Modbus retrofit for standby diesel generators that reports run hours, fault codes, fuel level, and load—staying alive on the panel's DC bus when mains and facility WiFi go dark.](https://dev.blues.io/example-apps/accelerators/legacy-diesel-generator-fleet-performance-uplift/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/legacy-diesel-generator-fleet-performance-uplift/) ### [Solar Array String-Level Performance Dashboard](https://dev.blues.io/example-apps/accelerators/solar-array-string-level-performance-dashboard/) [A cellular reference design that turns a solar array into a per-string, continuously-monitored asset for detecting soiling, shading, and bad modules without WiFi or site IT involvement.](https://dev.blues.io/example-apps/accelerators/solar-array-string-level-performance-dashboard/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/solar-array-string-level-performance-dashboard/) ### [Battery Management Systems](https://dev.blues.io/example-apps/accelerators/use-case/battery-management-systems/) ### [Aerial Lift / Rental Equipment Battery Health Monitor](https://dev.blues.io/example-apps/accelerators/aerial-lift-rental-equipment-battery-health-monitor/) [A cellular and satellite reference design that turns the battery pack on a rental aerial lift into a continuously monitored asset, surfacing state of charge, depth of discharge, and thermal status.](https://dev.blues.io/example-apps/accelerators/aerial-lift-rental-equipment-battery-health-monitor/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/aerial-lift-rental-equipment-battery-health-monitor/) ### [Off-Grid Solar Battery Site Controller](https://dev.blues.io/example-apps/accelerators/off-grid-solar-battery-site-controller/) [A cellular reference design for remote off-grid sites that reads Victron VE.Direct devices and reports battery state of charge, daily solar harvest, and load draw to Notehub every four hours.](https://dev.blues.io/example-apps/accelerators/off-grid-solar-battery-site-controller/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/off-grid-solar-battery-site-controller/) ### [Remote Cabinet Backup Battery Sentinel](https://dev.blues.io/example-apps/accelerators/remote-cabinet-backup-battery-sentinel/) [A cellular reference design for backup batteries in traffic-signal controllers and industrial RTUs that continuously monitors voltage, current, temperature, and state of charge with proactive alerts.](https://dev.blues.io/example-apps/accelerators/remote-cabinet-backup-battery-sentinel/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/remote-cabinet-backup-battery-sentinel/) ### [Downtime Prevention](https://dev.blues.io/example-apps/accelerators/use-case/downtime-prevention/) ### [Municipal Wastewater Lift Station Monitor](https://dev.blues.io/example-apps/accelerators/municipal-wastewater-lift-station-monitor/) [A cellular or satellite retrofit for municipal wastewater lift stations that catches pump failures, discharge obstructions, and high-water conditions before they become a sanitary overflow.](https://dev.blues.io/example-apps/accelerators/municipal-wastewater-lift-station-monitor/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/municipal-wastewater-lift-station-monitor/) ### [Rooftop HVAC Predictive Maintenance](https://dev.blues.io/example-apps/accelerators/rooftop-hvac-predictive-maintenance/) [A retrofit pack for commercial rooftop HVAC units that catches refrigerant loss, short-cycling, and clogged filters before the unit fails, using sensors and a cellular Notecard.](https://dev.blues.io/example-apps/accelerators/rooftop-hvac-predictive-maintenance/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/rooftop-hvac-predictive-maintenance/) ### [VFD Pump Predictive Maintenance](https://dev.blues.io/example-apps/accelerators/vfd-pump-predictive-maintenance/) [A reference design that turns an industrial centrifugal pump into a predictively-maintained asset by reading its VFD over Modbus RTU with a cellular Notecard for the uplink.](https://dev.blues.io/example-apps/accelerators/vfd-pump-predictive-maintenance/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/vfd-pump-predictive-maintenance/) ### [Energy Monitoring Solutions](https://dev.blues.io/example-apps/accelerators/use-case/energy-monitoring-solutions/) ### [Commercial Tenant Sub-Metering Bridge](https://dev.blues.io/example-apps/accelerators/commercial-tenant-sub-metering-bridge/) [A cellular retrofit for multi-tenant commercial buildings that gives landlords per-tenant interval energy usage and 15-minute demand readings each hour, on a data channel tenants cannot access.](https://dev.blues.io/example-apps/accelerators/commercial-tenant-sub-metering-bridge/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/commercial-tenant-sub-metering-bridge/) ### [EV Charger Session & Utilization Monitor](https://dev.blues.io/example-apps/accelerators/ev-charger-session-utilization-monitor/) [A cellular retrofit for Level 2 EV chargers that reports per-session metered energy, hourly utilization, and mains-offline alerts without modifying charger hardware or enrolling in OCPP.](https://dev.blues.io/example-apps/accelerators/ev-charger-session-utilization-monitor/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/ev-charger-session-utilization-monitor/) ### [Utility Distribution Transformer Load Monitor](https://dev.blues.io/example-apps/accelerators/utility-distribution-transformer-load-monitor/) [A cellular energy monitoring solution that gives utilities real-time load visibility at the distribution transformer, tracking per-phase loading, imbalances, and thermal stress.](https://dev.blues.io/example-apps/accelerators/utility-distribution-transformer-load-monitor/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/utility-distribution-transformer-load-monitor/) ### [Energy Savings](https://dev.blues.io/example-apps/accelerators/use-case/energy-savings/) ### [Commercial Plug-Load & After-Hours Waste Dashboard](https://dev.blues.io/example-apps/accelerators/commercial-plug-load-after-hours-waste-dashboard/) [A cellular monitor that clips CT clamps onto branch circuits in a commercial sub-panel and transmits hourly per-circuit power profiles so energy consultants can identify after-hours waste.](https://dev.blues.io/example-apps/accelerators/commercial-plug-load-after-hours-waste-dashboard/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/commercial-plug-load-after-hours-waste-dashboard/) ### [Demand-Response Solar + Battery Dispatcher](https://dev.blues.io/example-apps/accelerators/demand-response-solar-battery-dispatcher/) [A reference design giving a commercial solar and battery installation an independent cellular control channel for peak-rate discharge, off-peak charging, and utility demand-response events.](https://dev.blues.io/example-apps/accelerators/demand-response-solar-battery-dispatcher/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/demand-response-solar-battery-dispatcher/) ### [Multi-Site Walk-In Cooler Energy & Setpoint Monitor](https://dev.blues.io/example-apps/accelerators/multi-site-walk-in-cooler-energy-setpoint-monitor/) [A cellular reference design giving corporate operations teams a live view of temperature, compressor runtime, and door behavior across an entire walk-in cooler fleet, without touching operator WiFi.](https://dev.blues.io/example-apps/accelerators/multi-site-walk-in-cooler-energy-setpoint-monitor/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/multi-site-walk-in-cooler-energy-setpoint-monitor/) ### [Industrial Equipment Monitoring](https://dev.blues.io/example-apps/accelerators/use-case/industrial-equipment-monitoring/) ### [CNC Machine Spindle Load and Cycle Time Tracker](https://dev.blues.io/example-apps/accelerators/cnc-machine-spindle-load-and-cycle-time-tracker/) [A cellular reference design for CNC machine-tool OEMs to monitor spindle load, cycle counts, idle time, and alarm codes in their installed base without touching the customer's plant network.](https://dev.blues.io/example-apps/accelerators/cnc-machine-spindle-load-and-cycle-time-tracker/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/cnc-machine-spindle-load-and-cycle-time-tracker/) ### [Injection Molding Shot-to-Shot Process Monitor](https://dev.blues.io/example-apps/accelerators/injection-molding-shot-to-shot-process-monitor/) [A cellular shot-level process monitor for plastic injection molding machines that captures injection pressure and mold temperature, reducing each shot to key metrics for cloud-based process analysis.](https://dev.blues.io/example-apps/accelerators/injection-molding-shot-to-shot-process-monitor/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/injection-molding-shot-to-shot-process-monitor/) ### [Trailer Manufacturer Connected Trailer Platform](https://dev.blues.io/example-apps/accelerators/trailer-manufacturer-connected-trailer-platform/) [A connected-trailer platform for refrigerated trailer OEMs that reports cargo temperature, door events, and GPS position to the manufacturer's cloud over cellular with automatic satellite fallback.](https://dev.blues.io/example-apps/accelerators/trailer-manufacturer-connected-trailer-platform/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/trailer-manufacturer-connected-trailer-platform/) ### [Loss Prevention](https://dev.blues.io/example-apps/accelerators/use-case/loss-prevention/) ### [Construction Equipment Anti-Theft Tracker with Immobilizer](https://dev.blues.io/example-apps/accelerators/construction-equipment-anti-theft-tracker-with-immobilizer/) [A cellular and satellite reference design for construction equipment fleets that reports location continuously, fires alerts on geofence breach and after-hours motion, and supports a remote ignition immobilizer.](https://dev.blues.io/example-apps/accelerators/construction-equipment-anti-theft-tracker-with-immobilizer/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/construction-equipment-anti-theft-tracker-with-immobilizer/) ### [Reefer Trailer Cold-Chain & Door-Event Monitor](https://dev.blues.io/example-apps/accelerators/reefer-trailer-cold-chain-door-event-monitor/) [A cellular and satellite reference design that keeps continuous watch over refrigerated trailers, catching temperature excursions and logging door events to protect cold-chain cargo.](https://dev.blues.io/example-apps/accelerators/reefer-trailer-cold-chain-door-event-monitor/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/reefer-trailer-cold-chain-door-event-monitor/) ### [Remote Patient Monitoring](https://dev.blues.io/example-apps/accelerators/use-case/remote-patient-monitoring/) ### [Cellular Medication Adherence Pillbox](https://dev.blues.io/example-apps/accelerators/cellular-medication-adherence-pillbox/) [A cellular remote patient monitoring device that catches missed medication doses by reading snap-action switches inside a weekly pillbox and uploading an event to Notehub each time a compartment lid opens.](https://dev.blues.io/example-apps/accelerators/cellular-medication-adherence-pillbox/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/cellular-medication-adherence-pillbox/) ### [Post-Discharge Vitals Relay Hub](https://dev.blues.io/example-apps/accelerators/post-discharge-vitals-relay-hub/) [A cellular remote patient monitoring hub for post-discharge recovery programs that scans for BLE-enabled medical devices and relays completed readings to Notehub, with immediate alerts on clinical threshold exceedances.](https://dev.blues.io/example-apps/accelerators/post-discharge-vitals-relay-hub/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/post-discharge-vitals-relay-hub/) ### [Remotely Monitored Assets](https://dev.blues.io/example-apps/accelerators/use-case/remotely-monitored-assets/) ### [Off-Grid Livestock Water Tank Monitor](https://dev.blues.io/example-apps/accelerators/off-grid-livestock-water-tank-monitor/) [A solar-powered cellular and satellite system for off-grid livestock water tanks that monitors water level, pump current, and battery voltage to alert ranchers before a stock tank runs dry.](https://dev.blues.io/example-apps/accelerators/off-grid-livestock-water-tank-monitor/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/off-grid-livestock-water-tank-monitor/) ### [Remote Apiary Hive Health Monitor](https://dev.blues.io/example-apps/accelerators/remote-apiary-hive-health-monitor/) [A solar-powered cellular hive monitor that tracks hive weight and brood-box climate every 15 minutes and captures a daily acoustic snapshot of the colony, without grid power.](https://dev.blues.io/example-apps/accelerators/remote-apiary-hive-health-monitor/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/remote-apiary-hive-health-monitor/) ### [Safety Assurance](https://dev.blues.io/example-apps/accelerators/use-case/safety-assurance/) ### [Construction Site Environmental & Noise Exposure Monitor](https://dev.blues.io/example-apps/accelerators/construction-site-environmental-noise-exposure-monitor/) [A cellular reference design that turns a construction site into a continuously monitored area, tracking PM2.5, PM10, and sound levels in real time without site WiFi or power outlets.](https://dev.blues.io/example-apps/accelerators/construction-site-environmental-noise-exposure-monitor/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/construction-site-environmental-noise-exposure-monitor/) ### [Lone Worker Panic and Fall Detection Beacon](https://dev.blues.io/example-apps/accelerators/lone-worker-panic-and-fall-detection-beacon/) [A wearable cellular and satellite safety beacon for lone workers that detects falls and accepts a panic-button press, reaching dispatchers from remote locations where coverage is thin.](https://dev.blues.io/example-apps/accelerators/lone-worker-panic-and-fall-detection-beacon/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/lone-worker-panic-and-fall-detection-beacon/) ### [Regulatory-Grade Pharmacy and Lab Cold Storage Audit Monitor](https://dev.blues.io/example-apps/accelerators/regulatory-grade-pharmacy-and-lab-cold-storage-audit-monitor/) [A cellular reference design providing continuous, timestamped temperature records for pharmacy and lab cold storage, with immediate alerts on out-of-range conditions.](https://dev.blues.io/example-apps/accelerators/regulatory-grade-pharmacy-and-lab-cold-storage-audit-monitor/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/regulatory-grade-pharmacy-and-lab-cold-storage-audit-monitor/) ### [Supply Chain Tracking](https://dev.blues.io/example-apps/accelerators/use-case/supply-chain-tracking/) ### [Pallet-Attached Cold Chain Logger](https://dev.blues.io/example-apps/accelerators/pallet-attached-cold-chain-logger/) [A pallet-attached cold-chain logger for pharma and food shippers that provides an independent, shipper-controlled condition record and dispatches alerts when temperature, humidity, shock, tilt, or cargo-bay-opening thresholds are crossed.](https://dev.blues.io/example-apps/accelerators/pallet-attached-cold-chain-logger/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/pallet-attached-cold-chain-logger/) ### [Rail Car Condition & Interchange Tracker](https://dev.blues.io/example-apps/accelerators/rail-car-condition-interchange-tracker/) [A cellular and satellite reference design for leased freight and tank rail cars that monitors location, shock events, and coupler state, with optional lading pressure and temperature monitoring.](https://dev.blues.io/example-apps/accelerators/rail-car-condition-interchange-tracker/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/rail-car-condition-interchange-tracker/) ### [Truck Roll Reduction](https://dev.blues.io/example-apps/accelerators/use-case/truck-roll-reduction/) ### [Commercial Grease Interceptor Level Monitor](https://dev.blues.io/example-apps/accelerators/commercial-grease-interceptor-level-monitor/) [A cellular device for pumping providers that reports commercial grease interceptor fill level every 15 minutes and dispatches alerts when a threshold is reached.](https://dev.blues.io/example-apps/accelerators/commercial-grease-interceptor-level-monitor/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/commercial-grease-interceptor-level-monitor/) ### [Propane / LPG Tank Fill Telemetry](https://dev.blues.io/example-apps/accelerators/propane-lpg-tank-fill-telemetry/) [A reference design giving propane dealers per-tank fill telemetry across their delivery territory, enabling demand-driven dispatch and days-until-empty projections over cellular or satellite.](https://dev.blues.io/example-apps/accelerators/propane-lpg-tank-fill-telemetry/) [View Accelerator](https://dev.blues.io/example-apps/accelerators/propane-lpg-tank-fill-telemetry/)