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RA-01 / RA-02 LoRa SX1278 433MHz Long-Range Wireless Module — SPI, Arduino, IoT
RA-01 / RA-02 LoRa SX1278 433MHz Long-Range Wireless Module SPI, Arduino, IoT
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RA-01 / RA-02 LoRa SX1278 433MHz Long-Range Wireless Module — SPI
The RA-01 (SMD pad) and RA-02 (castellated edge) are compact LoRa wireless modules based on the Semtech SX1278 chip, operating at 433MHz. With spread-spectrum modulation and up to 10km line-of-sight range, they are ideal for low-power, long-range IoT sensor networks, remote telemetry, and Arduino-based wireless projects.
Key Specifications
| Parameter | Value |
|---|---|
| Module Variants | RA-01 (SMD) / RA-02 (castellated) |
| RF IC | Semtech SX1278 |
| Frequency | 433MHz (ISM band) |
| Modulation | LoRa (CSS spread spectrum) |
| Max TX Power | +20dBm (100mW) |
| Receiver Sensitivity | −148dBm |
| Max Range (LoS) | ~10km (open field) |
| Interface | SPI (MOSI, MISO, SCK, NSS) |
| Supply Voltage | 3.3V DC |
| Current (TX) | ~120mA @ +20dBm |
| Current (Sleep) | ~0.2μA |
| Spreading Factor | SF6 – SF12 (configurable) |
| Antenna Connector | IPEX / U.FL (external antenna required) |
RA-01 vs RA-02
| Feature | RA-01 | RA-02 |
|---|---|---|
| Pad Type | SMD (bottom pads) | Castellated edges |
| PCB Integration | Reflow soldering | Hand-solderable to PCB edge |
| Prototyping | Requires adapter board | Easier with breakout board |
Why Choose RA-01/RA-02?
- 10km Range — LoRa spread spectrum achieves km-scale range at <1kbps data rate
- −148dBm Sensitivity — Exceptional receiver sensitivity for weak signal environments
- Ultra-Low Sleep Current — 0.2μA sleep mode for years of battery life in IoT nodes
- SPI Interface — Compatible with Arduino, ESP32, STM32, Raspberry Pi
- 433MHz ISM Band — License-free operation in most countries
Typical Applications
- Long-range IoT sensor networks (temperature, humidity, GPS tracking)
- Smart agriculture remote monitoring
- LoRaWAN gateway node (with LoRaWAN stack)
- Wireless meter reading (water, gas, electricity)
- Search and rescue / asset tracking
- Arduino-to-Arduino long-range communication
Arduino Library
Use RadioHead library (RH_RF95 driver) or LoRa library by Sandeep Mistry. Initialize with: LoRa.begin(433E6); for 433MHz operation.
FAQ
Q: Does RA-01/RA-02 support LoRaWAN?
A: The SX1278 hardware supports LoRaWAN, but you need a LoRaWAN stack (e.g., LMIC library) and a LoRaWAN network server (TTN, Chirpstack) for full LoRaWAN operation.
Q: What antenna should I use with RA-01/RA-02?
A: Use a 433MHz quarter-wave whip antenna (~17cm wire) or a 433MHz spring antenna via IPEX connector for best range.
Package Contents
- 1× RA-01 or RA-02 LoRa SX1278 433MHz Wireless Module
