Annabelle

The intelligence center of your Digital Stables network. Annabelle is the always-on hub that connects all your field devices — it listens continuously over LoRa for transmissions from Daffodil, Gloria, Langley, and every other sensor node on the farm, and relays their data to the Digital Stables cloud over WiFi.

Beyond data relay, Annabelle actively works for the network: it downloads hourly weather forecasts from the internet and broadcasts them back over LoRa, allowing field devices to make real-time power decisions based on predicted conditions. It also monitors the health and last-seen status of every connected device, acting as the watchdog for the whole farm.

ESP32 LoRa 433MHz WiFi Weather Forecasts Device Monitoring Cloud Gateway Always On TOTP Security

^$300

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What Annabelle Does

LoRa Network Listener

Always listening on 433 MHz LoRa for transmissions from field devices. Receives sensor readings from Daffodil, Gloria, Langley, and other nodes across the farm without any polling — devices transmit and Annabelle is always there to receive.

Cloud Gateway

Connects to the internet over WiFi and forwards all received sensor data to the Digital Stables cloud in real time. Annabelle is the bridge between the LoRa farm network and the wider internet — field devices do not need their own WiFi.

Weather Forecast Distribution

Downloads hourly weather forecasts from the internet and broadcasts them over LoRa to all field devices. Daffodil uses this data to intelligently manage its power budget — reducing LED brightness and adjusting sleep cycles when cloudy conditions are forecast.

Device Health Monitoring

Tracks the last-seen timestamp and signal strength (RSSI) of every connected device. Annabelle knows when a node has gone silent and can alert the cloud, giving you early warning of a sensor failure, dead battery, or enclosure breach before it becomes a problem.

Local Display

Two HT16K33 7-segment displays show live device readings and network status at a glance — no phone or computer needed. RGB status LEDs give an at-a-glance indication of network health and cloud connectivity right from where Annabelle is mounted.

Secure Communications

All LoRa packets are authenticated with TOTP (time-based one-time passwords) using a shared secret, preventing unauthorized devices from injecting data into the network. RTC-synchronized timestamps ensure token validity across all nodes.

Compatible Field Devices

Annabelle natively receives and relays data from these Digital Stables devices:

Daffodil Gloria Langley Chinampa Seedling Monitor

Hardware

Annabelle is a mains-powered hub device built for permanent indoor installation — in a shed, barn, or equipment room. It has no sleep mode and maintains a continuous presence on both the LoRa network and the internet.

Annabelle Controller

Main hub board

MCU	ESP32 (FireBeetle32)
Radio	SX127x LoRa 433MHz (Ra-02)
RTC	PCF8563T (I²C)
Display	2× HT16K33 7-segment (I²C 0x70, 0x71)
LEDs	WS2812 RGB status LEDs (FastLED)
Storage	LittleFS on-board flash
Power	Mains (always on, no battery)
Security	TOTP authentication on LoRa packets

I²C Addresses

Address	Device
`0x51`	PCF8563T RTC
`0x70`	HT16K33 Display 1
`0x71`	HT16K33 Display 2

Connectivity

LoRa 433MHz — receives from all field devices
WiFi — cloud data upload & weather download
USB serial — programming & debug

Annabelle sits at the center of the Digital Stables local network. Field devices communicate exclusively over LoRa — a long-range, low-power radio protocol that requires no WiFi infrastructure in the field. Annabelle provides the single internet-connected point for the entire farm network.

LoRa Field Layer

Battery or solar-powered sensors that transmit over 433MHz LoRa:

Daffodil — water, flow, environment
Gloria — solar pump & tank level
Langley — electric fence monitor
Chinampa — aquaponics controller

Annabelle — Hub

Always-on bridge between the LoRa field network and the internet:

Receives all LoRa transmissions
Relays data to Digital Stables cloud
Downloads & broadcasts weather
Monitors device health

Internet Layer

Cloud services Annabelle connects to over WiFi:

Digital Stables cloud — sensor data storage & dashboard
Weather API — hourly forecast download for farm-wide distribution