FireBeetle_Covers-LoRa_Radio_915MHz_SKU

Introduction

DFRobot FireBeetle series are low power consumption controllers designed for Internet of Things (IoT) development. The FireBeetle series are aiming straight at the point fast and convenient low-power IoT building. There are three categories of FireBeetle series, containing Boards (main control), Covers (expansion boards) and related Accessories.

FireBeetle LoRa 915MHz wireless transmission module adopts a high-performance chip SX127x LoRa 915MHz and with built-in PA (power amplifier) gain, compatible with Aruino. It supports long-range monitor, FSK modulation and the maximum transmission rate is 300K[null bps]. It also supports LoRaTM, the maximum transmission rate is 37.5Kbps. The circuit current is even lower than 0.2uA in the low power mode. It can be widely used in remote home automation detection, health monitoring and wearable device and so on.

NOTE: All parameters related to wireless signals in the same network should maintain consistency to avoid communication problems.

Specifications

Operating Current: 3.3V
Operating Frequency: 915MHz
Modulation Type: LoRaTM
Output Power: ≤20dBm
Receiving Sensitivity: -139dBm
Emersion Current: ≤120mA
Receiving Current: ≤15mA
Sleep Current: ≤1uA
Transmission Power Range: -1dBm~20dBm(Maximum)
Transmission Mode: FIFO/ DMA
Operating Frequency: 900MHz~1000MHz(typical value: 433MHz)
Transmission Range: 1 Km
Modulation Type: LoRaTM /FSK /GFSK /OOK
Built-in aerials offer good anti-jamming capacity
The Maximum RSSI is 127dB
FIFO Volume: 256bytes
Support CRC Frequency-hopping
SPI Interface
GPIO Interface: 5 (can be used as interruption)
Operating Temperature: -20℃~+70℃
Dimension: 58 x 29 mm/ 2.28 x 1.14 inches

Board Overview

FireBeetle Covers-LoRa Radio 915MHz is main controlled by MISO, MOSI, SCK, CS, RESET. Connect these control interfaces to MISO, MOSI, SCK of FireBeetle board, connect CS (chip-select) and RESET to D2, D3, D4, D5 with Dupont wires.

Fig1: FireBeetle Covers-LoRa Radio 915MHz data control pins

NOTE: When disconnect NC, VCC is the output voltage of the power supply(USB power supply: 5V, lithium battery power supply: 3.7V)

Tutorial

Requirements

Hardware
- 2 x ESP32 Board
- 2 x FireBeetle Covers-LoRa Radio 915MHz
- Some wire

The default connection setting is to connect CS to D4, RESET to D2, you can also modify programs to connect pins to other IO interfaces (with init pass parameters: init(uint8_t NSSPin = NSS_PIN, uint8_t NRESETPin = RESET_PIN)).

$Fig2: Firebeetle_Covers-915MHz-Connect_CS\&RESET$

Software
- Arduino IDE Click to Download Arduino IDE from Arduino®

Connection

Joint ESP32 board and LoRa module together
Connect ESP32 board to PC via USB line

Sample Code

Click to download FireBeetle Covers-LoRa Radio 915MHz library first.

Download the master program and the slave program to two ESP32 board respectively.
The Slave program code

/*!
 * @file receiverTest.ino
 * @brief DFRobot's received data
 * @n [Get the module here]
 * @n This example is receive.
 * @n [Connection and Diagram]
 *
 * @copyright   [DFRobot](https://www.dfrobot.com), 2016
 * @copyright   GNU Lesser General Public License
 *
 * @author [yangyang]
 * @version  V1.0
 * @date  2017-04-10
 */

#include <DFRobot_LoRa.h>

DFRobot_LoRa lora;

uint8_t len;
uint8_t rxBuf[32];

void setup()
{
    Serial.begin(115200);

    pinMode(LED_BUILTIN, OUTPUT);
    Serial.println("Receiver Test");

    while(!lora.init()) {
        Serial.println("Starting LoRa failed!");
        delay(100);
    }

    lora.rxInit();
}
void loop()
{
    if(lora.waitIrq()) {   // wait for RXDONE interrupt
        lora.clearIRQFlags();
        len = lora.receivePackage(rxBuf);  // receive data
        Serial.write(rxBuf, len);
        Serial.println();
        lora.rxInit();    // wait for packet from master

        // print RSSI of packet
        Serial.print("with RSSI ");
        Serial.println(lora.readRSSI());

        static uint8_t i;
        i = ~i;
        digitalWrite(LED_BUILTIN, i);
    }
}

The Master program code

/*!
 * @file sendTest.ino
 * @brief DFRobot's send data
 * @n [Get the module here]
 * @n This example is send.
 * @n [Connection and Diagram]
 *
 * @copyright   [DFRobot](https://www.dfrobot.com), 2016
 * @copyright   GNU Lesser General Public License
 *
 * @author [yangyang]
 * @version  V1.0
 * @date  2017-04-10
 */

#include <DFRobot_LoRa.h>

DFRobot_LoRa lora;

uint8_t counter = 0;
uint8_t sendBuf[] = "HelloWorld!";

/* The default pin:
 *      SS:D4
 *      RST:D2 (If you are using the FireBeetle Board-ESP8266 motherboard controller, the RST defaults to D3)
 */

void setup()
{
    Serial.begin(115200);

    while(!lora.init()) {
        Serial.println("Starting LoRa failed!");
        delay(100);
    }
}
void loop()
{
    Serial.print("Sending packet: ");
    Serial.println(counter);

    // send packet
    lora.sendPackage(sendBuf, 11); // sending data
    lora.idle();    // turn to standby mode

    counter++;
#if 0
    if(counter%10 == 0) {
        lora.sleep();
        delay (5000);// sleep 5 seconds
    }
#endif

    delay(500);
}

Result

Fig3: The master sends data

Fig3: The slave receives data

FAQ

For any questions, advice or cool ideas to share, please visit the DFRobot Forum.

FireBeetle_Covers-LoRa_Radio_915MHz_SKU_TEL0122-DFRobot