DRF1278F 433MHz LoRa SX1278 Long Range RF Wireless Module Arduino - Image 1
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DRF1278F 433MHz LoRa SX1278 Long Range RF Wireless Module Arduino

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HC-06 Bluetooth Module Wireless Serial UART for Arduino ESP32 Raspberry Pi
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Description

📡 DRF1278F 433MHz LoRa SX1278 Long-Range RF Wireless Module | AuscomTech

The DRF1278F 433MHz LoRa Wireless Module is a high-performance, low-power RF communication module based on the Semtech SX1278 transceiver.
It combines traditional FSK/GFSK modulation with advanced LoRa™ spread-spectrum technology, delivering exceptional long-range communication, high sensitivity, and strong anti-interference performance.

Designed for Arduino-compatible development, IoT systems, and industrial telemetry, the DRF1278F is ideal for applications requiring reliable wireless links over long distances with minimal power consumption.

⭐ Key Features

📡 LoRa™ Long-Range Wireless Technology
Uses Semtech SX1278 LoRa modulation to achieve long-distance communication (up to 5 km line-of-sight in open environments).

🎯 High Receiver Sensitivity

  • Up to -148 dBm sensitivity (LoRa mode)

  • Maintains stable links in low-signal and noisy RF environments

⚡ Low Power Consumption

  • Receive current: ~10–12 mA

  • Optimised for battery-powered and solar-powered devices

🚀 High Output Power

  • Adjustable RF output up to +20 dBm

  • Enables strong signal penetration and long-range coverage

🛡️ Excellent Anti-Interference Performance

  • Channel rejection: 56 dB

  • Strong resistance to RF noise and jamming

🔄 Multiple Modulation Modes

  • LoRa™

  • FSK / GFSK
    Supports FIFO mode and direct transmission for flexible firmware design.

🔧 Advanced RF Features

  • AFC (Automatic Frequency Control)

  • Carrier sensing

  • Forward Error Correction (FEC)

  • Low-power sleep modes

📐 Compact & Easy to Integrate

  • Small footprint module

  • SPI interface for direct connection to microcontrollers

📊 Technical Specifications

RF & Performance

  • Chipset: Semtech SX1278

  • Frequency Range: 410 – 525 MHz

  • Typical Operating Frequency: 433 MHz

  • Transmit Power: +19 to +20.5 dBm

  • Channel Rejection: 56 dB

Receiver Sensitivity

  • FSK @ 1.2 kbps (±5 kHz): -121 dBm

  • LoRa @ 146 bps, BW 62.5 kHz, SF12: -139 dBm

  • LoRa @ 293 bps, BW 125 kHz, SF12: -133 dBm

Electrical

  • Operating Voltage: 1.8 – 3.6 V

  • Receive Current: ~10–12 mA

  • Interface: SPI

Environmental

  • Operating Temperature: -20°C to +70°C

Physical

  • Dimensions: 17 × 16.5 mm

🧩 Compatible With

• Arduino (with 3.3V logic)
• ESP32 / ESP8266
• STM32 microcontrollers
• Raspberry Pi (via SPI & level shifting)
• Custom IoT and embedded systems

🔧 Typical Applications

• LoRa IoT sensor nodes
• Smart agriculture monitoring
• Wireless metering (water, gas, electricity)
• Industrial telemetry & automation
• Remote data acquisition
• Wireless alarm and security systems
• Smart home & building automation
• Long-range RF control systems

⚠️ Important Notes

• 3.3V logic only – not 5V tolerant
• External antenna required for optimal range
• RF performance depends on antenna design, environment, and firmware configuration

📦 Package Includes

• 1 × DRF1278F 433MHz LoRa SX1278 RF Wireless Module

📌 Code Examples & Usage – 433 MHz LoRa SX1278 (DRF1278F) Long-Range RF Module

📋 Overview

The SX1278 LoRa module is a long-range, low-power wireless transceiver operating in the 433 MHz ISM band. It uses SPI communication and supports true LoRa modulation, making it ideal for:

  • Long-distance sensor networks

  • Telemetry & monitoring

  • IoT projects

  • Point-to-point wireless links

  • Low-power data transmission

With the right settings, LoRa can achieve kilometres of range (line-of-sight).

⚠ Important Notes Before You Start

✔ 433 MHz antenna is required — never power the module without one
✔ Logic level is 3.3 V (most SX1278 boards are NOT 5 V tolerant)
✔ Use a 3.3 V regulator capable of supplying burst current
✔ Works with Arduino (via level shifting) and ESP32 (native 3.3 V)

🔌 Typical Pin Connections (SPI)

SX1278 → Arduino / ESP32

SX1278 Pin Function Arduino UNO ESP32 (Example)
VCC 3.3 V 3.3 V 3.3 V
GND Ground GND GND
SCK SPI Clock D13 GPIO18
MISO SPI MISO D12 GPIO19
MOSI SPI MOSI D11 GPIO23
NSS / CS Chip Select D10 GPIO5
RST Reset D9 GPIO14
DIO0 IRQ D2 GPIO26

⚠ If using Arduino UNO, use level shifters or SPI resistors for safety.

📦 Library Setup (Arduino IDE)

Install the LoRa library by Sandeep Mistry:

  1. Arduino IDE → Library Manager

  2. Search “LoRa”

  3. Install LoRa by Sandeep Mistry

🧪 Example 1 — Basic LoRa Transmitter (433 MHz)

#include <SPI.h>
#include <LoRa.h>#define SS 10
#define RST 9
#define DIO0 2void setup() {
Serial.begin(9600);
while (!Serial);

LoRa.setPins(SS, RST, DIO0);

if (!LoRa.begin(433E6)) {
Serial.println(“LoRa init failed!”);
while (true);
}

Serial.println(“LoRa Transmitter Ready”);
}

void loop() {
Serial.println(“Sending packet…”);
LoRa.beginPacket();
LoRa.print(“Hello from AuscomTech!”);
LoRa.endPacket();

delay(2000);
}

🧪 Example 2 — Basic LoRa Receiver

Upload this sketch to the receiving node.

#include <SPI.h>
#include <LoRa.h>#define SS 10
#define RST 9
#define DIO0 2void setup() {
Serial.begin(9600);
while (!Serial);

LoRa.setPins(SS, RST, DIO0);

if (!LoRa.begin(433E6)) {
Serial.println(“LoRa init failed!”);
while (true);
}

Serial.println(“LoRa Receiver Ready”);
}

void loop() {
int packetSize = LoRa.parsePacket();
if (packetSize) {
Serial.print(“Received: “);
while (LoRa.available()) {
Serial.print((char)LoRa.read());
}
Serial.print(” | RSSI: “);
Serial.println(LoRa.packetRssi());
}
}

📡 Example 3 — Send Sensor Data (Temperature)

float temperature = 23.5;

LoRa.beginPacket();
LoRa.print(“Temp=”);
LoRa.print(temperature);
LoRa.print(“C”);
LoRa.endPacket();

On the receiver side, parse the string to extract values.

⚙ Example 4 — Optimising Range vs Speed

LoRa.setSpreadingFactor(12); // 6–12 (higher = longer range)
LoRa.setSignalBandwidth(125E3); // 125 kHz typical
LoRa.setCodingRate4(5); // 4/5 coding rate
LoRa.enableCrc();

Typical Settings

Use Case Spreading Factor
Short range / fast SF7
Balanced SF9
Long range SF12

🔋 Low-Power Tip (Sleep Between Transmissions)

LoRa.sleep();
delay(5000);
LoRa.idle();

This is ideal for battery-powered sensor nodes.

🧠 Troubleshooting Tips

  • Nothing received?

    • Check frequency is 433E6 on both ends

    • Ensure antennas are connected

    • Confirm NSS / DIO0 wiring

  • Garbage data?

    • Both ends must use the same SF, bandwidth, coding rate

  • Short range?

    • Increase spreading factor

    • Improve antenna quality

    • Ensure clear line-of-sight

Additional information

Weight 50 g
Dimensions 260 × 160 × 20 mm

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