TTGO LORA32 915Mhz SX1276 ESP32 Oled-display Bluetooth WIFI Lora development board

Description :

The 915MHz antenna needs to be in connection with the IPEX interface (if the antenna is not connected, the signal reception will be unstable)
Lithium battery charge and discharge circuit, when the battery is full, the blue LED will stop working. When using, please pay attention to the positive and negative of the battery, otherwise it will be damaged!

With IO port touch screen touch signal input, you need to add the 100nF pull-down capacitor to this pin!
 

Specifications:

This product is a SX1276 chip based on ESP32 WIFI including OLED, namely LoRa remote modem, 915MHz frequency, high sensitivity is over-148dBm, + 20dBm output power, high reliability, long transmission distance.

the onboard 4Mt bytes (32 Mt bit) wi-fi antenna, 0.96 inch oled display, lithium battery charging circuit, CP2102 interface and USB serial chip, the perfect support for Arduino development environment, can be used for program checking and product development is very easy and fast.
Operating voltage: 3.3V to 7V

Operating temperature range: -40 ° C to + 90 ° C

Support for Sniffer software protocol analysis, Station, SoftAP, and Wi-Fi Direct modes
Data rates: 150 Mbps @ 11n HT40., 72 Mbps @ 11n HT20, 54 Mbps @ 11g, 11 Mbps @ 11b
transmit power: 19.5 dBm @ 11b, 16.5 dBm @ 11g, 15.5 dBm @ 11n
receiver sensitivity up to -98 dBm
UDP sustained throughput of 135 Mbps

Test Code

https://github.com/LilyGO/TTGO-LORA32-V2.0/tree/LilyGO-915-V1.0

https://github.com/Xinyuan-LilyGO/TTGO-LoRa-Series

Note:This product does not include the battery.

For example One

(1) 868/915MhzOLED LoRaSender
#include <SPI.h>
#include <LoRa.h>
#include <Wire.h>
#include "SSD1306.h"
#include "images.h"

#define SCK 5 // GPIO5 - SX1278's SCK
#define MISO 19 // GPIO19 - SX1278's MISO
#define MOSI 27 // GPIO27 - SX1278's MOSI
#define SS 18 // GPIO18 - SX1278's CS
#define RST 14 // GPIO14 - SX1278's RESET
#define DI0 26 // GPIO26 - SX1278's IRQ (interrupt request)
#define BAND 868E6 // 915E6

unsigned int counter = 0;

SSD1306 display (0x3c, 4, 15);
String rssi = "RSSI -";
String packSize = "-";
String packet;


void setup () {
  pinMode (16, OUTPUT);
  pinMode (2, OUTPUT);
  
  digitalWrite (16, LOW); // set GPIO16 low to reset OLED
  delay (50);
  digitalWrite (16, HIGH); // while OLED is running, GPIO16 must go high
  
  Serial.begin (9600);
  while (! Serial);
  Serial.println ();
  Serial.println ("LoRa Sender Test");
  
  SPI.begin (SCK, MISO, MOSI, SS);
  LoRa.setPins (SS, RST, DI0);
  if (! LoRa.begin (868)) {
    Serial.println ("Starting LoRa failed!");
    while (1);
  }
  //LoRa.onReceive(cbk);
// LoRa.receive ();
  Serial.println ("init ok");
  display.init ();
  display.flipScreenVertically ();
  display.setFont (ArialMT_Plain_10);
  delay (1500);
}

void loop () {
  display.clear ();
  display.setTextAlignment (TEXT_ALIGN_LEFT);
  display.setFont (ArialMT_Plain_10);
  
  display.drawString (0, 0, "Sending packet:");
  display.drawString (90, 0, String (counter));
  display.display ();

  // send packet
  LoRa.beginPacket ();
  LoRa.print ("hello");
  LoRa.print (counter);
  LoRa.endPacket ();

  counter ++;
  digitalWrite (2, HIGH); // turn the LED on (HIGH is the voltage level)
  delay (1000); // wait for a second
  digitalWrite (2, LOW); // turn the LED off by making the voltage LOW
  delay (1000); // wait for a second
}



(2) 868mhz / 915Mhz OLED LoRaSender
#include <SPI.h>
#include <LoRa.h>
#include <Wire.h>
#include "SSD1306.h"
#include "images.h"

#define SCK 5 // GPIO5 - SX1278's SCK
#define MISO 19 // GPIO19 - SX1278's MISO
#define MOSI 27 // GPIO27 - SX1278's MOSI
#define SS 18 // GPIO18 - SX1278's CS
#define RST 14 // GPIO14 - SX1278's RESET
#define DI0 26 // GPIO26 - SX1278's IRQ (interrupt request)
#define BAND 868E6 // 915E6

SSD1306 display (0x3c, 4, 15);
String rssi = "RSSI -";
String packSize = "-";
String packet;



void loraData () {
  display.clear ();
  display.setTextAlignment (TEXT_ALIGN_LEFT);
  display.setFont (ArialMT_Plain_10);
  display.drawString (0, 15, "Received" + packSize + "bytes");
  display.drawStringMaxWidth (0, 26, 128, packet);
  display.drawString (0, 0, rssi);
  display.display ();
}

void cbk (int packetSize) {
  packet = "";
  packSize = String (packetSize, DEC);
  for (int i = 0; i <packetSize; i ++) {packet + = (char) LoRa.read (); }
  rssi = "RSSI" + string (LoRa.packetRssi (), DEC);
  loraData ();
}

void setup () {
  pinMode (16, OUTPUT);
  digitalWrite (16, LOW); // set GPIO16 low to reset OLED
  delay (50);
  digitalWrite (16, HIGH); // while OLED is running, GPIO16 must go high,
  
  Serial.begin (9600);
  while (! Serial);
  Serial.println ();
  Serial.println ("LoRa Receiver Callback");
  SPI.begin (SCK, MISO, MOSI, SS);
  LoRa.setPins (SS, RST, DI0);
  if (! LoRa.begin (868E6)) {
    Serial.println ("Starting LoRa failed!");
    while (1);
  }
  //LoRa.onReceive(cbk);
  LoRa.receive ();
  Serial.println ("init ok");
  display.init ();
  display.flipScreenVertically ();
  display.setFont (ArialMT_Plain_10);
  
  delay (1500);
}

void loop () {
  int packetSize = LoRa.parsePacket ();
  if (packetSize) {cbk (packetSize); }
  delay (10);
}