SX1278 LoRa Ra-02 433MHz Wireless Module AI-Thinker
₵155.00
The AI-Thinker Ra-02 is a compact, long-range wireless communication module powered by the Semtech SX1278 RF transceiver chip. Operating on the 433 MHz frequency band, it utilizes Chirp Spread Spectrum (CSS) LoRa modulation to achieve ultra-long-range transmission with high immunity to interference and low power consumption.
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Key Specifications
| Parameter | Value / Description |
| RF Transceiver | Semtech SX1278 |
| Operating Frequency | $433\text{ MHz}$ (Bandrange: $410\text{ MHz} – 525\text{ MHz}$) |
| Modulation Schemes | LoRa™, FSK, GFSK, MSK, GMSK, OOK |
| Operating Voltage | $1.8\text{V} – 3.7\text{V DC}$ (3.3V Typical — Not 5V tolerant!) |
| Transmit Power | Up to $+20\text{ dBm}$ ($100\text{ mW}$) |
| Receive Sensitivity | As low as $-148\text{ dBm}$ |
| Communication Range | Up to $3 – 5\text{ km}$ (Line-of-sight/Urban), up to $10\text{ km}$ (Rural/Optimal) |
| Interface | SPI (Serial Peripheral Interface) |
| Antenna Connector | IPEX (U.FL) connector or spring antenna solder pad |
| Package / Dimensions | SMD-16 ($17\text{ mm} \times 16\text{ mm} \times 3.2\text{ mm}$) |
Common Pinout (SPI Interface)
VCC: Power Supply ($3.3\text{V}$)GND: System GroundSCK: SPI Serial ClockMISO: Master In Slave OutMOSI: Master Out Slave InNSS/CS: SPI Chip Select / Slave SelectRST: Hardware ResetDIO0: Digital I/O 0 (typically configured as TX/RX Interrupt)
⚠️ Important: If interfacing with a 5V microcontroller (such as an Arduino Uno), use a logic level converter on the SPI lines (MOSI, SCK, NSS) to prevent damaging the module. Never power or transmit without an antenna connected, as this can burn out the power amplifier.
Key Features & Applications
Long-Range & Interference-Resistant: CSS modulation enables communication through high-noise environments and heavy obstacles.
Low Power Consumption: Features ultra-low sleep current ($\approx 1\,\mu\text{A}$), making it ideal for battery-operated remote nodes.
Applications:
IoT remote sensor networks (agriculture, environment monitoring)
Smart meter readings and telemetry
Home automation and long-range remote control
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