You can use DFRobot’s Lark Weather Station Sensor (EDU0157-EN) with a UNIHIKER to collect weather readings, but the available manufacturer material does not document a complete Node-RED weather-station flow. DFRobot documents the sensor’s Python/I2C connection to UNIHIKER, plus separate examples of MQTT publishing to SIoT and installing Node-RED on UNIHIKER. Treat connecting those pieces as an integration you must configure and verify—not a ready-made or tested recipe.
What the Lark and UNIHIKER setup can do
The standard Lark Weather Station Sensor, SKU EDU0157-EN, measures wind speed and direction, temperature, humidity, and barometric pressure. DFRobot lists UNIHIKER as a compatible controller. Its documented UNIHIKER example reads a timestamp and those five measurements using Python. DFRobot product listing · DFRobot UNIHIKER example and sensor documentation
That is the documented starting point for a Node-RED project: first acquire readings from the EDU0157-EN on UNIHIKER; then decide how to pass them to Node-RED for display, storage, or alerts. The sources establish those components separately, not an end-to-end weather flow or a connection to the Lark messaging service.
What you need to connect the sensor
- Lark Weather Station Sensor EDU0157-EN.
- A UNIHIKER board. Confirm the exact model against the live library instructions before setup.
- The included Gravity-4P I2C/UART sensor cable and Type-C data cable. Do not assume another 4-pin or Type-C cable has a compatible connector and pinout.
DFRobot’s product specifications list a 3.3–5.5 V DC working voltage, 40 mA working current, and 2 mA sleep current. The manufacturer lists a wind-speed range of 0.5–12 m/s, eight wind directions, temperature from −20 to 60 °C with ±0.2 °C stated accuracy, humidity from 0–99% RH with ±2% RH stated accuracy, and pressure from 300–1100 hPa. Its stated relative pressure accuracy is ±1 Pa under the listed conditions of 25 °C, 950–1050 hPa, and ΔP ≤1 kPa. These are vendor specifications, not independent test results. DFRobot product listing
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The listing also specifies 16 MB of built-in storage and says it supports 160 days of data at one recording per minute. That storage statement should not be confused with the computer-connected operating mode: DFRobot’s setup guide says that when connected to a computer, the station provides data export rather than storing data in its standalone recording mode. DFRobot setup guide
Choose the sensor connection mode
| Mode | Documented setting | What to check |
|---|---|---|
| I2C | Default communication mode; address 0x42. | Use the I2C-compatible wiring and software configuration. DFRobot’s UNIHIKER Python example uses this mode. |
| UART | 115200 baud. | Use compatible UART wiring and make sure your acquisition code is configured for this interface and speed. |
DFRobot describes both modes as real-time data output, with physical units included in the output. A mode’s existence does not guarantee that a particular Node-RED node or library supports it directly. DFRobot product listing · DFRobot sensor documentation
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Set up and verify readings on UNIHIKER
Before involving Node-RED, confirm that the UNIHIKER can read valid measurements from the station. DFRobot’s example specifies Python 3.x and Pinpong 0.4.9 or later, and uses the Lark Weather Station library. It initializes the board, creates an I2C connection at address 0x42, initializes the sensor, synchronizes local time, and reads values. Check the current library instructions for installation steps and model compatibility; the example’s requirements alone do not establish that every current UNIHIKER model or software image uses the same setup. DFRobot UNIHIKER example
- Connect the station to UNIHIKER using the included Gravity-4P cable, with the station in its default I2C mode unless you specifically intend to use UART.
- Use the current DFRobot library instructions to install or verify the required Python and Pinpong environment for your board.
- Run the manufacturer’s example or an equivalent acquisition script and confirm that it returns timestamp, wind speed, wind direction, temperature, humidity, and pressure.
- Only after the readings are valid, decide how your code will send them to Node-RED. Record the chosen transport, message format, and any topic or endpoint settings so the Node-RED input can be configured to match.
Orient the station and understand its recording behavior
For the manufacturer’s setup guidance, point the station’s Type-C port toward south. After startup, rotate the wind vane to complete direction calibration, then wait 10 seconds. The guide describes automatic recording at 30-second intervals. It also distinguishes standalone recording from a computer-connected session, where the station is used for exporting data rather than storing data in that standalone mode. DFRobot setup guide
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How Node-RED could fit—and what remains unverified
A reasonable design to investigate is Lark sensor → UNIHIKER acquisition code → MQTT or another transport → Node-RED flow → dashboard or notification. DFRobot community material shows Lark measurements collected by UNIHIKER and sent by MQTT to SIoT topics, and separately shows Node-RED installed on UNIHIKER in a plant-monitoring project. Those examples do not document the exact weather-specific flow, confirm that SIoT is the intended Node-RED input, or establish an end-to-end result for this combination. DFRobot community Lark/SIoT project
Before building the flow, settle three implementation details: how the Python acquisition program exposes each reading, how the data reaches Node-RED, and the message structure Node-RED should expect. For example, an MQTT-based design needs a broker and matching topic and payload configuration on both publisher and subscriber. The cited examples do not supply a verified weather-station Node-RED flow or its node configuration, so those choices must be validated for your installation rather than copied from an assumed recipe. DFRobot community Lark/SIoT project · DFRobot community Node-RED-on-UNIHIKER tutorial
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Do not confuse the standard station with Lark Weather Station Pro
The EDU0157-EN path documented here uses the standard station’s I2C/UART interfaces and UNIHIKER acquisition example. DFRobot’s separate Wi-Fi/MQTT setup guide is for the Lark Weather Station Pro, SKU EDU0173, and SIoT V2; it describes network requirements and MQTT topic configuration for that Pro model. Those wireless features and instructions should not be assumed to apply to EDU0157-EN. DFRobot Lark Weather Station Pro guide
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