Device console
Every request, as it arrives
With the reason when one is rejected. Decode LoRaWAN payloads, check link timing and send typed commands from a prompt. The device confirms them, or declines with the reason.
readings / minaccepted, signed and stored
Send a value. HydroNode does the rest.
The free IoT platform for ESP32, Arduino and LoRaWAN sensors. Build a device in the browser or bring your own firmware. HydroNode stores every reading, charts it, learns what normal looks like and updates your devices over the air.
Free for up to 20 sensors.Every feature included, no card.
← raw uplinks, as bytesverified, decoded, stored →
30+measurement types
6ESP chip families, no code
2ways in: HTTPS and LoRaWAN
20sensors free per account
01Quickstart
Sensor to dashboard in three steps
// WiFi, time, TLS and HMAC: handled by the library #include <HydroNode.h> HydroNode hydro(SENSOR_ID, SECRET_KEY); void setup() { hydro.connectWiFi(WIFI_SSID, WIFI_PASS); hydro.begin(); } void loop() { HydroNodeValue v[] = { { "TEMPERATURE", readTemp() }, { "HUMIDITY", readHumidity() }, }; hydro.sendValues(v, 2); // one signed request delay(60000); }
AI setup /
Not sure which path fits? Copy a guided prompt and let your AI assistant walk you through Builder, Arduino, ESPHome, LoRaWAN or Home Assistant.
02Platform
Feature guide →From the bench to a fleet
Air quality
64Moderate
pm-sensorPM2.5 limits64
co2-sensorCO₂ 612 ppm91
voc-sensorVOC index 10483
Air quality as one honest number
CO₂, PM, VOC and NOx become one score from 0 to 100. A station always shows its worst sensor, never a flattering average.
DeviceVersionJob
greenhouse-01esp32c30.6.0 → 0.7.0Downloading 0%
workshop-01esp8266config r14 → r15Verifying
rooftop-wxesp32s30.7.0Installed
garden-bed-2esp320.7.0Installed
Update every device over the air
Change wiring, sleep or timing for one board or a whole template. Images are signed, a device that does not come back healthy rolls back on its own.
reservoirevery 5 min2 min agoHealthy
rooftop-wxevery 60 s4 min agoDelayed
garden-bed-2every 10 min3 h agoOffline
Know when a sensor goes quiet
HydroNode learns how often each sensor reports and judges silence against that rhythm, not a fixed timer. Push or email per stage, and a note when it is back.
Above learned range
Explainable incident detection
Every channel learns its own time aware range. Related findings become one incident instead of ten alerts.
AI analysisgreenhouse-01
Water pH rose from 6.6 to 8.1 within 40 minutes, above its learned evening range. EC moved with it, which points to dosing rather than a probe fault.
AI analysis in plain words
Optional, built only from facts HydroNode has already checked. You can see exactly what goes to the model.
Average current
0.21mAThe builder picks the most frugal power mode your parts allow.Build a device without code
Pick a board and sensors, the builder suggests pins and scans the I²C bus. Flash over USB from Chrome or Edge.
Typed device commandsQueue a command with a type and a value. A pump that must not run twice, does not.
AutomationsNotify you, command the device or call your webhook when a value crosses a line or a sensor goes quiet.
Dashboards and reportsOne layout on web and apps. Weekly digest, PDF and CSV, calibration that never touches raw data.
Public mapPut an outdoor station on the world map, or follow someone else’s. No account needed to view.
Team sharingShare sensors at read, write or admin level, transfer ownership, run one greenhouse with many hands.
Two ways in, both signedHTTPS with HMAC SHA256 and a short replay window, or LoRaWAN via TTN, ChirpStack or Helium.
03Use cases
All 30+ sensor types →One platform, every environment
Hydroponics and aquaponics
greenhouse-01streamingTrack pH and EC against your crop targets. Learned channel patterns point out unusual drift long before the plants show it.
pH6.82
EC1.85mS/cm
Water temp21.6°C
Dissolved O₂8.1mg/L
04Ecosystem
More than a dashboard
Native apps, open firmware and integrations.
iPhone and iPadApp Store
HydroNode for iOS
Home and lock screen widgets, Live Activities, incident timelines and your own alert level per sensor.
Download on the App Store →AndroidIn development
HydroNode for Android
The same sensors, widgets, push notifications and device commands, built natively with Jetpack Compose.
Google Play release plannedIntegrationHACS
Home Assistant
In the default HACS catalog. Every sensor becomes a native entity, pushed over WebSocket in real time.
View on GitHub →Open sourceLibrary Manager
Arduino library
ESP32 and ESP8266: WiFi, millisecond time, TLS, HMAC signing and typed commands the device confirms or declines.
View on GitHub →Open sourceESPHome 2026.7.1+
ESPHome component
Map any ESPHome sensor to HydroNode in YAML, with remote commands driving your existing automations.
View on GitHub →Open hardwareLoRaWAN 868 MHz
HydroNode Station
Solar powered outdoor station: SCD41, SPS30, SHT45, BMP390, LTR390. No mains, no WiFi, no SIM. STM32WL.
View on GitHub →
Yes. Every account can create up to 20 sensors with every feature included. There is no subscription, no card and no activation code.
Anything that can send a signed HTTPS request or a LoRaWAN uplink. The Device Builder flashes ESP32, ESP32 S2, S3, C3, C6 and ESP8266 boards without code. Custom firmware uses the Arduino library or the ESPHome component, and LoRaWAN devices connect through The Things Network, ChirpStack or Helium.
No. In the Device Builder you pick a board, sensors, pins and a power mode, then flash it from Chrome or Edge over USB. Later changes reach the device over the air. If you prefer code, you can download the same setup as a PlatformIO project, an Arduino sketch or ESPHome YAML.
Firmware images are signed with ECDSA P-256 and checked on the device before they run. A device that does not come back healthy rolls back to its previous firmware on its own. Config updates work on every board, firmware updates on the ESP32 family.
HydroNode learns how often each sensor reports. It marks a sensor delayed after three missed intervals and offline after twelve, and tells you by push or email if you want it to.
Yes. Install HydroNode from the default HACS catalog. Every sensor becomes a native entity that updates in real time over WebSocket, ready for your automations.
Only you, until you decide otherwise. You can share a sensor at read, write or admin level, or publish an outdoor station on the public map. Devices sign every request with HMAC SHA256.