AC03 LoRa Easy

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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: AC03 LoRa Easy

URL: https://docs.leafony.com/en/leaf/communication/ac03/

Description / headings (excerpt): Features / Specification / Tips / Stacking a leaf directly above this leaf

This leaf has been discontinued. Its successor is AC07 LoRa Mary.

The microcontroller interface changes from UART on AC03 to SPI on AC07. When migrating, check the connection instructions and libraries documented for AC07.

Features

Send and receive data over LoRa radio with a compatible device at a remote location. Combined with an MCU (microcontroller) leaf and a sensor leaf, this leaf can transmit sensor measurements. Set up devices at both the transmitting and receiving ends.

It uses EASEL’s certified ES920LRA1 LoRa module and connects to the MCU leaf via UART.

Specification

Item	Description
Part Number	ES920LRA1
SoC	MKL16Z128 (ARM Cortex-M0+)
RF Transceiver	SX1276 (SEMTECH)
Frequency range	920.6～928.0MHz
Transmission speed	146bps～22kbps
RX sensitivity	-118～-142dBm
TX power	Max 13dBm（20mW)
RF certification	TELEC
Approximate communication distance (wire antenna)	Prospect 5km
Flash	128KB
RAM	32KB
Interfaces	UART
Dimension	W23×D32.8×H4.6mm

Tips

Stacking a leaf directly above this leaf

This leaf uses components that are 2 mm or taller. Placing another leaf directly above it without a spacer may result in a poor electrical connection. Always insert an AX04 Spacer between this leaf and the leaf above it.

Block diagram

Pinassign

See the pin assignment data.

Sample App

LoRa

Library

Libraries are available for this leaf. Please install the necessary libraries from Environment to use them.