Leaf Reference
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Find specifications and connections by kit or function. To choose products to buy, see the product catalog. Check the shop for prices, availability, and planned releases.
This reference also includes leaves supplied in kits and documentation for discontinued leaves.
See the glossary for abbreviations and connector terminology.
When adding a leaf, use the guide to combining leaves and assembly basics to check power, pins, and fastening. Documentation status describes the readiness of instructions, separately from product availability.
Browse by kit
Section titled “Browse by kit”Choose your kit to see its leaves in photos. You can also browse by function below.
Basic Kit 27 leaf types
7 types of leaves. Select a photo or name for specifications and pin assignments.
AP03 STM32 MCU
Accessories and other included items
AZ62 Connector Cover
AZ66 Basic Kit Case
- Product sheet× 1
- Product label× 1
- CR2032 coin cell battery× 1
- M2×18 mm screw× 2
- Screwdriver× 1
Extension Kit9 leaf types / Sales ended
9 types of leaves. Select a photo or name for specifications and pin assignments.
AI02 SP&PIR
Accessories and other included items
- Caution note× 1
ESP32 Wi-Fi Kit 25 leaf types / Sales ended
5 types of leaves. Select a photo or name for specifications and pin assignments.
Accessories and other included items
AZ62 Connector Cover
AZ63 Nut Plate
AZ67 AAA battery holder (Japanese)
AZ68 18650 battery holder (Japanese)
- Product sheet× 1
- Product label× 1
- M2×12 mm screw× 2
- Magnet, 10 mm diameter × 2 mm thick× 1
Basic Kit6 leaf types / Sales ended
6 types of leaves. Select a photo or name for specifications and pin assignments.
Accessories and other included items
AZ62 Connector Cover
AZ66 Basic Kit Case
- CR2032 coin cell battery× 1
- M2×18 mm screw× 2
- Screwdriver× 1
ESP32 Wi-Fi Kit5 leaf types / Sales ended
5 types of leaves. Select a photo or name for specifications and pin assignments.
Accessories and other included items
AZ62 Connector Cover
AZ63 Nut Plate
- AAA battery holder× 1
- Caution note× 1
- M2×12 mm screw× 2
- Magnet, 10 mm diameter × 2 mm thick× 1
Processors
Section titled “Processors” AP01 AVR MCU
Run programs to read sensors and control other leaves. Uses an ATmega328P with digital I/O, PWM outputs, and analog inputs.
AP03 STM32 MCU
Read sensors and control other leaves with a 32-bit STM32 microcontroller. Use a USB leaf for USB connections or a Shield leaf for SWD connections.
AP03B STM32
Read sensors and control other leaves. A redesigned version of AP03, equipped with an STM32L452REI6.
AP05 STM32N6
An MCU leaf intended for evaluating image processing and edge AI. Uses an STMicroelectronics STM32N6-series microcontroller.
Communication
Section titled “Communication” AC02 BLE Sugar
Combine with an MCU leaf to send and receive sensor data and other information over Bluetooth LE. Uses a Silicon Labs BGM11S22F256GA-V2 module with Japanese radio certification.
AC07 LoRa Mary
Combine with an MCU leaf to exchange data with compatible devices over LoRa radio. Uses a Murata Type ABZ module and a STAF chip antenna covered by Japanese radio design certification.
AC08 LTE-M Mary
Combine with an MCU leaf to send and receive data over an LTE-M cellular network. Requires an AV06 power leaf, a compatible SIM, and a mobile service contract. Uses a Murata Type 1SC module and a certified chip antenna.
AC09 Cat-M1 TY
A leaf for data communication over Cellular LPWA Cat-M1 networks. Includes a Taiyo Yuden WSCLxADAH2Z-series module, a nanoSIM slot, and a U.FL connector for an external antenna.
AI01 4-Sensors
Measure temperature, humidity, and light, and use acceleration to detect tilt or movement. Combine with an MCU leaf to monitor the surrounding environment or the movement of an attached object.
AI05 Env Sensors
Measure temperature, humidity, pressure, and 3-axis acceleration. The standard configuration uses a BME280 and LIS2DW12, read over I2C by an MCU leaf.
AV01 CR2032
Supply 3.3V to the leaves from a CR2032 coin cell. An MCU can read battery voltage, and a power switch turns the supply on or off.
AV06 1.8V–5.5V
Supply 3.3V at up to 1A from a 1.8V–5.5V battery connected through a PH connector. An MCU can read the battery voltage.
AV05 Solar Charger
A power leaf for supplying power and charging using a solar panel.
Extension
Section titled “Extension” AX01 Shield
Connect Arduino Shields to add functions, or attach SWD/ICSP tools. Includes Arduino Shield connectors and three leaf interfaces.
AX02 29pin
Connect leaf signals to external circuits for prototyping and signal checks. Breaks out all 29 leaf interface pins to 2.54mm-pitch through holes.
AX02B 29pin
Connect external circuits for prototyping and signal checks. Breaks out the 29 Leafony Bus pins to 2.54mm-pitch through-hole pads.
AX04 Spacer
Increase the spacing between stacked leaves to prevent components from touching.
AX05B I Meas.
Connect an external current meter to measure current on the Leafony Bus V33 and VBUS lines. Inserts the instrument in series with the power line.
Other Leaves and Accessories
Section titled “Other Leaves and Accessories” AZ01 USB
Connect this leaf to upload sketches to an AVR MCU or use the serial monitor. It uses an FTDI FT232RQ USB-to-UART converter. A step-down circuit converts USB VBUS (5V) to 3.3V, supplying both VBUS and 3.3V to the leaves. The successor is AZ01C USB-C. Uploading to AP01 through AZ01C requires a manual reset.
AZ01C USB-C
Connect to a computer through USB Type-C for serial communication and 3.3V power to the leaves. Uploading a program to AP01 requires a manual reset.
AZ61 Connector
Electrically connect stacked leaves. Place ACR (anisotropic conductive rubber) between the leaves and compress it with screws to make contact.
AZ62 Connector Cover
The Connector Cover protects the ACR (anisotropic conductive rubber) from dirt.
AZ63 Nut Plate
The Nut Plate secures leaves with screws. Do not use ordinary hex nuts, as they may touch board contacts and cause a short circuit.
AZ66 Basic Kit Case
Houses Basic Kit and attaches to a magnetic surface using the magnet on its base.
Discontinued
Section titled “Discontinued” AP02 ESP32 MCU
Run programs and send or receive data over Wi-Fi or Bluetooth LE. Uses an ESP32-WROOM-32 with Japanese radio certification, and supports uploading sketches over USB.
AC03 LoRa Easy
Send and receive data over LoRa radio. This leaf is discontinued. Its successor is AC07 LoRa Mary, which changes the MCU interface from UART to SPI.
AC06 Wi-Fi Mary
Combine with an STM32 MCU to send and receive data over Wi-Fi. AVR MCU is not supported. This leaf is discontinued.
AC04 LTE-M King M
Send and receive data over an LTE-M cellular network. Requires AC05, a compatible SIM, and a mobile service contract. This leaf is discontinued. The successor LTE-M configuration uses AC08 LTE-M Mary and the AV06 power leaf.
AC05 LTE-M King S
Combine with LTE-M King M to supply power, upload programs to the MCU, and read battery voltage. This leaf is discontinued. For a new LTE-M configuration, see AC08 LTE-M Mary and the AV06 power leaf.
AI02 SP&PIR
Detect an approaching person and play sound through a speaker. An MCU can control actions such as playing a melody when someone approaches.
AI03 MIC&VR&LED
Read ambient sound or a potentiometer setting, and light an LED. An MCU can use these readings to produce an indication based on sound level.
AI04 LCD
Display text or numbers on an 8-character × 2-line LCD and accept input from two switches. The reference page includes power setup, libraries, and a text-display quickstart.
AV02 CR2450
Supply 3.3V to the leaves from a CR2450 coin cell and read battery voltage through an MCU. Includes a power switch.
AV03 AA BAT
Supply 3.3V to the leaves from AA batteries and read battery voltage through an MCU. Includes a battery holder and power switch.
AV04 2V～4.5V
Supply 3.3V to the leaves from a battery connected through an SH connector. An MCU can also read the battery voltage.
AX03 Leaf x2
A connector leaf for arranging leaves side by side.
AX05 I Meas.
Connect an external ammeter to measure current on the 3.3V and VBUS lines.
AX06 Grove&5V
Connect 5V Grove modules. Supports UART, I2C, analog input, and digital input.
AX07 Back to back
A connector leaf for connecting leaves back to back.
AX08 29pin header
Connect leaf signals to external circuits through pin headers. Breaks out all 29 leaf interface pins at a 2.54mm pitch.
AZ02 RTCµSD
Read the time and store data on a separately purchased microSD card. Combine with an MCU to record measurements with timestamps.
AZ67 AAA battery holder (Japanese)
Connect AAA batteries to the AV04 power leaf. Includes a JST SH connector.
AZ68 18650 battery holder (Japanese)
Connect an 18650 battery to the AV04 power leaf. Fits a battery measuring 18mm in diameter and 65mm in length, and includes a JST SH connector.