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+# Heltec WiFi LoRa 32 V2 
+
+This example demonstrates sending a simple data packet using a Heltec Wifi LoRa 32 V2 development board. Please follow every instruction step below from top to bottom.
+
+[Heltec LoRa 32 V2 Product Page](https://heltec.org/project/wifi-lora-32/)  
+[Heltec LoRa 32 V2 Docs](https://heltec-automation-docs.readthedocs.io/en/latest/esp32/index.html)
+
+## Installing the Heltec ESP32 Library
+
+From the Arduino IDE, open the Library Manager (Sketch->Include Library->Manage Libraries). In the search box, type Heltec ESP32 and look for `Heltec ESP32 Dev-Boards`. Select the latest version and install.
+
+## Install Serial Driver
+Find Directions [here](https://heltec-automation-docs.readthedocs.io/en/latest/general/establish_serial_connection.html).
+
+## Install Arduino-ESP32 Board Support
+Find Directions [here](https://heltec-automation-docs.readthedocs.io/en/latest/esp32+arduino/quick_start.html#via-arduino-board-manager)
+
+## Select Board
+Arduino IDE:  
+1. Select Tools -> Board: -> WiFi LoRa 32(V2)
+
+## Select Region
+Arduino IDE:  
+1. Select Tools -> LoRaWAN Region: -> REGION_US915
+
+## Obtain Heltec License Key
+
+### Upload `GetChipID` example
+Arduino IDE:  
+1. Select File -> Examples -> ESP32 -> ChipID -> GetChipID  
+2. Select Tools -> Port: "COM# or ttyACM#"  
+3. Select Sketch -> Upload 
+4. Wait for Done uploading message
+5. Select Tools -> Serial Monitor
+Serial Monitor Window
+1. Select 115200 baud from bottom right dropdown.
+2. You should see something that looks like this every second `ESP32 Chip ID = ############`  
+3. Save this Chip ID
+
+### Obtain License Key with Chip ID
+1.Go to [resource.heltec.cn/search](http://resource.heltec.cn/search)
+2. Enter ChipID
+3. Save license field, will look like `0x########,0x#########,0x########,0x########`	
+
+## Upload `OTAA_OLED` example
+Arduino IDE:  
+1. Select File -> Examples -> ESP32_LoRaWAN -> OTAA_LED
+2. Enter License Key at line 32 
+```
+uint32_t  license[4] = {`0x########,0x#########,0x########,0x########};
+```
+3. Enter DevEUI(msb), AppEUI(msb), and AppKey(msb) from Helium Console, at lines 34,35,36.
+```
+uint8_t DevEui[] = { FILL_ME_IN };
+uint8_t AppEui[] = { FILL_ME_IN };
+uint8_t AppKey[] = { FILL_ME_IN };
+```
+4. Select Sketch -> Upload.
+5. Wait for Done uploading message
+6. Select Tools -> Serial Monitor
+Serial Monitor Window
+1. Select 115200 baud from bottom right dropdown.
+2. Wait for device to successfully join, may take 1-3 min, and show several failures. Do not be alarmed by the failures, it is expected.
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diff --git a/Heltec-WiFi-LoRa-32-V2/longfi-us915/longfi-us915.ino b/Heltec-WiFi-LoRa-32-V2/longfi-us915/longfi-us915.ino
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+/*
+ * HelTec Automation(TM) LoRaWAN 1.0.2 OTAA example use OTAA, CLASS A
+ *
+ * Function summary:
+ *
+ * - use internal RTC(150KHz);
+ *
+ * - Include stop mode and deep sleep mode;
+ *
+ * - 15S data send cycle;
+ *
+ * - Informations output via serial(115200);
+ *
+ * - Only ESP32 + LoRa series boards can use this library, need a license
+ *   to make the code run(check you license here: http://www.heltec.cn/search );
+ *
+ * You can change some definition in "Commissioning.h" and "LoRaMac-definitions.h"
+ *
+ * HelTec AutoMation, Chengdu, China.
+ * 成都惠利特自动化科技有限公司
+ * https://heltec.org
+ * support@heltec.cn
+ *
+ *this project also release in GitHub:
+ *https://github.com/HelTecAutomation/ESP32_LoRaWAN
+*/
+
+#include <ESP32_LoRaWAN.h>
+#include "Arduino.h"
+
+/*license for Heltec ESP32 LoRaWan, quary your ChipID relevant license: http://resource.heltec.cn/search */
+uint32_t  license[4] = {0xC1670CF8, 0x19C71AD5, 0x6CE47540, 0x8CF267EC};
+/* OTAA para*/
+uint8_t DevEui[] = { FILL_ME_IN };
+uint8_t AppEui[] = { FILL_ME_IN };
+uint8_t AppKey[] = { FILL_ME_IN };
+
+/* ABP para*/
+uint8_t NwkSKey[] = { 0x15, 0xb1, 0xd0, 0xef, 0xa4, 0x63, 0xdf, 0xbe, 0x3d, 0x11, 0x18, 0x1e, 0x1e, 0xc7, 0xda,0x85 };
+uint8_t AppSKey[] = { 0xd7, 0x2c, 0x78, 0x75, 0x8c, 0xdc, 0xca, 0xbf, 0x55, 0xee, 0x4a, 0x77, 0x8d, 0x16, 0xef,0x67 };
+uint32_t DevAddr =  ( uint32_t )0x007e6ae1;
+
+/*LoraWan Class, Class A and Class C are supported*/
+DeviceClass_t  loraWanClass = CLASS_A;
+
+/*the application data transmission duty cycle.  value in [ms].*/
+uint32_t appTxDutyCycle = 15000;
+
+/*OTAA or ABP*/
+bool overTheAirActivation = true;
+
+/*ADR enable*/
+bool loraWanAdr = false;
+
+/* Indicates if the node is sending confirmed or unconfirmed messages */
+bool isTxConfirmed = false;
+
+/* Application port */
+uint8_t appPort = 2;
+
+/*!
+* Number of trials to transmit the frame, if the LoRaMAC layer did not
+* receive an acknowledgment. The MAC performs a datarate adaptation,
+* according to the LoRaWAN Specification V1.0.2, chapter 18.4, according
+* to the following table:
+*
+* Transmission nb | Data Rate
+* ----------------|-----------
+* 1 (first)       | DR
+* 2               | DR
+* 3               | max(DR-1,0)
+* 4               | max(DR-1,0)
+* 5               | max(DR-2,0)
+* 6               | max(DR-2,0)
+* 7               | max(DR-3,0)
+* 8               | max(DR-3,0)
+*
+* Note, that if NbTrials is set to 1 or 2, the MAC will not decrease
+* the datarate, in case the LoRaMAC layer did not receive an acknowledgment
+*/
+uint8_t confirmedNbTrials = 8;
+
+/*LoraWan debug level, select in arduino IDE tools.
+* None : print basic info.
+* Freq : print Tx and Rx freq, DR info.
+* Freq && DIO : print Tx and Rx freq, DR, DIO0 interrupt and DIO1 interrupt info.
+* Freq && DIO && PW: print Tx and Rx freq, DR, DIO0 interrupt, DIO1 interrupt, MCU sleep and MCU wake info.
+*/
+uint8_t debugLevel = LoRaWAN_DEBUG_LEVEL;
+
+/*LoraWan region, select in arduino IDE tools*/
+LoRaMacRegion_t loraWanRegion = ACTIVE_REGION;
+
+
+static void prepareTxFrame( uint8_t port )
+{
+    appDataSize = 4;//AppDataSize max value is 64
+    appData[0] = 0x00;
+    appData[1] = 0x01;
+    appData[2] = 0x02;
+    appData[3] = 0x03;
+}
+
+// Add your initialization code here
+void setup()
+{
+  if(mcuStarted==0)
+  {
+    LoRaWAN.displayMcuInit();
+  }
+  Serial.begin(115200);
+  while (!Serial);
+  SPI.begin(SCK,MISO,MOSI,SS);
+  Mcu.init(SS,RST_LoRa,DIO0,DIO1,license);
+  deviceState = DEVICE_STATE_INIT;
+}
+
+// The loop function is called in an endless loop
+void loop()
+{
+  switch( deviceState )
+  {
+    case DEVICE_STATE_INIT:
+    {
+      LoRaWAN.init(loraWanClass,loraWanRegion);
+      break;
+    }
+    case DEVICE_STATE_JOIN:
+    {
+      LoRaWAN.displayJoining();
+      LoRaWAN.join();
+      break;
+    }
+    case DEVICE_STATE_SEND:
+    {
+      LoRaWAN.displaySending();
+      prepareTxFrame( appPort );
+      LoRaWAN.send(loraWanClass);
+      deviceState = DEVICE_STATE_CYCLE;
+      break;
+    }
+    case DEVICE_STATE_CYCLE:
+    {
+      // Schedule next packet transmission
+      txDutyCycleTime = appTxDutyCycle + randr( -APP_TX_DUTYCYCLE_RND, APP_TX_DUTYCYCLE_RND );
+      LoRaWAN.cycle(txDutyCycleTime);
+      deviceState = DEVICE_STATE_SLEEP;
+      break;
+    }
+    case DEVICE_STATE_SLEEP:
+    {
+      LoRaWAN.displayAck();
+      LoRaWAN.sleep(loraWanClass,debugLevel);
+      break;
+    }
+    default:
+    {
+      deviceState = DEVICE_STATE_INIT;
+      break;
+    }
+  }
+}
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