Read temperature, humidity, pressure and acceleration with AI05

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Read this official Leafony page and explain its key points in English. For hardware help, first ask for a photo or the installed leaf models, assembly and power sources, then the goal and tools. Clarify which LED or display changed and whether a cable or leaf was replaced. Do not equate an unseen reset button with an absent one, or I2C acknowledgement with a working display. Verify specifications against sources; distinguish observations from hypotheses. Follow a redirect to its destination; if unreadable, ask for the relevant text instead of guessing.

Page: Read temperature, humidity, pressure and acceleration with AI05

URL: https://docs.leafony.com/en/examples/beginner/stm32-mcu/env-sensors/

Description / headings (excerpt): Read environmental data and 3-axis acceleration every second with AP03 and AI05 Env Sensors. Find the required leaves, sample upload steps, measured output and an explanation of the readings. / What you need / Get and build the sample / Up…

Table of contents

Watch temperature and humidity readings arrive from a tiny board, then gently tilt it to see the motion readings change. Try this first experiment with AI05 Env Sensors and the official read_sensors sample.

The sample displays temperature, humidity, pressure and 3-axis acceleration (acceleration along X, Y and Z) on your PC every second.

AI05 Env Sensors product photo, showing the environmental sensor and 3-axis accelerometer

AI05 Env Sensors product photo. Combine this leaf with AP03 to run the program, and with the leaves needed for the PC connection.

What you need

Equipment	Purpose
AP03 STM32 MCU	Run the sample
AI05 Env Sensors	Measure with BME280 and LIS2DW12
USB serial leaf and a data-capable USB cable	Connect to the PC
Suitable power and fastening parts	Supply 3.3 V and secure the leaves
PC and PlatformIO	Build, upload and monitor serial output

Disconnect all power, including USB, batteries and external supplies, before changing leaves. Check assembly and replacement and AI05 connection precautions. AI01 4-Sensors and AX06 Grove&5V have conflicting signals or addresses.

This sample targets AP03. Operation on AP03B or other MCUs has not been verified. If your tools are not set up, start with PlatformIO for STM32.

Get and build the sample

Download the AI05 Env Sensors repository. In VS Code, open platformio/read_sensors. From a terminal:

git clone https://github.com/leafony/ai05-env-sensors.git
cd ai05-env-sensors
pio run -d platformio/read_sensors

Dependencies are installed from the supplied platformio.ini. The first build may take several minutes to download the framework and libraries.

Upload to AP03

Uploading replaces the program currently stored on AP03.

Run pio device list to find the USB serial port.
Close any serial monitor using that port.
Move AP03 to Program, check that the mode LED is on, and press Reset once.
Upload with this command:

pio run -d platformio/read_sensors -t upload --upload-port /dev/cu.usbserial-XXXX

/dev/cu.usbserial-XXXX is an example. Replace it with the detected port; on Windows it may be COM3.

See the AP03 Program / Run and Reset illustrated guide for switch locations and the operation sequence. Avoid using “up” and “down” alone when the leaf has a different orientation.

Return to Run and read the output

After confirming that the upload completed, return the switch to Run and check that the LED is off. Open the monitor at 115200 bps, then press Reset once.

pio device monitor -d platformio/read_sensors --port /dev/cu.usbserial-XXXX --baud 115200

Success means seeing BME280 (0x76): ready and LIS2DW12: ready at 0x18 at startup, followed by readings every second. SHT40 and SGP40 are not fitted in the standard configuration, so skipped (optional) is expected.

Output verified on hardware

This log was captured on November 6, 2026 with AP03, a standard AI05 and a USB serial connection, using the official sample at commit a6b318f. The sample source was built without modification. The written contents were verified, and startup was checked again after returning the switch to Run.

AI05 Env Sensors / Leafony AP03
I2C: SDA=PB9, SCL=PB8, 400 kHz; sample interval: 1000 ms
BME280 (0x76): ready
SHT40: not detected at 0x44; skipped (optional)
SGP40: not detected at 0x59; skipped (optional)
LIS2DW12: ready at 0x18

--- uptime=33376 ms ---
BME280: temperature=30.62 C, humidity=34.83 %RH, pressure=1006.17 hPa
LIS2DW12: x=-0.467 g, y=-0.626 g, z=0.622 g

Temperature is in °C, humidity in %RH, pressure in hPa, and acceleration in g. Acceleration includes gravity even when the board is stationary. Slowly tilt the board to see X, Y and Z change. These are example sensor readings from this session, not an accuracy comparison test.

A note on this session: we worked with an AI agent

For this check, a PC-capable AI agent obtained, built and uploaded the sample and checked the readings. A person operated Program / Run and Reset.

Doing the same with AI requires tools and permission to access PC files and USB serial devices. A text-only chat cannot directly operate connected hardware. You can also follow the steps above to run the same sample without AI.

What to try next

Change kSampleIntervalMs to adjust the sampling interval.
Motion detection and post-trigger recording: try interrupts, FIFO recording and waveform display.

If the sample does not run, check Program / Run and Reset, exclusive use of the serial port, and the 115200 bps setting. If sensors are not detected, check power, I2C connections and pull-ups.