WIFI & BLE & UART & GPIO Test

ESP32

• 구현 사용핀 사진들

 

485 통신용 UART2

• 동작확인
• 아두이노 시리얼과 연결하여 통신테스트 OK

ESP32 Hardwre Serial2 Example

https://circuits4you.com/2018/12/31/esp32-hardware-serial2-example/

ESP32 sourcecode

• 시리얼통신 테스트

/*
 * There are three serial ports on the ESP known as U0UXD, U1UXD and U2UXD.
 * 
 * U0UXD is used to communicate with the ESP32 for programming and during reset/boot.
 * U1UXD is unused and can be used for your projects. Some boards use this port for SPI Flash access though
 * U2UXD is unused and can be used for your projects.
 * 
*/

#define RXD 9
#define TXD 10

#define RXD2 16
#define TXD2 17

void setup() {
  // Note the format for setting a serial port is as follows: Serial2.begin(baud-rate, protocol, RX pin, TX pin);
  Serial.begin(115200);
  // Serial1.begin(9600, SERIAL_8N1, RXD, TXD);
  Serial2.begin(9600, SERIAL_8N1, RXD2, TXD2);
  
  Serial.println("Serial Txd is on pin: "+String(TX));
  Serial.println("Serial Rxd is on pin: "+String(RX));
}

void loop() { //Choose Serial1 or Serial2 as required
  while (Serial2.available()) {
    Serial.print(char(Serial2.read()));
  }
  while (Serial.available()) {
    Serial2.print(char(Serial.read()));
  }
}

UNO sourcecode 

• 시리얼통신 테스트

#include <SoftwareSerial.h>
SoftwareSerial mySerial(2, 3);
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);

  mySerial.begin(9600);
  
}

int count = 0;
void loop() {
  // put your main code here, to run repeatedly:
  // Serial.println("TEST");

  while (mySerial.available()) {
    Serial.print(char(mySerial.read()));
  }
  while (Serial.available()) {
    mySerial.print(char(Serial.read()));
  }

}

GPIO Pins

GPIO	19, 18, 5
ADC	34, 35, 13, 12, 14, 27, 26, 25

WIFI

• 동작확인

BLUETOOTH

• 동작확인
• NimBLE-Arduino 적용
• ble test sourcecode

/*
    Video: https://www.youtube.com/watch?v=oCMOYS71NIU
    Based on Neil Kolban example for IDF: https://github.com/nkolban/esp32-snippets/blob/master/cpp_utils/tests/BLE%20Tests/SampleNotify.cpp
    Ported to Arduino ESP32 by Evandro Copercini

   Create a BLE server that, once we receive a connection, will send periodic notifications.
   The service advertises itself as: 6E400001-B5A3-F393-E0A9-E50E24DCCA9E
   Has a characteristic of: 6E400002-B5A3-F393-E0A9-E50E24DCCA9E - used for receiving data with "WRITE" 
   Has a characteristic of: 6E400003-B5A3-F393-E0A9-E50E24DCCA9E - used to send data with  "NOTIFY"

   The design of creating the BLE server is:
   1. Create a BLE Server
   2. Create a BLE Service
   3. Create a BLE Characteristic on the Service
   4. Create a BLE Descriptor on the characteristic
   5. Start the service.
   6. Start advertising.

   In this example rxValue is the data received (only accessible inside that function).
   And txValue is the data to be sent, in this example just a byte incremented every second. 
*/

/** NimBLE differences highlighted in comment blocks **/

/*******original********
#include <BLEDevice.h>
#include <BLEServer.h>
#include <BLEUtils.h>
#include <BLE2902.h>
***********************/
#include <NimBLEDevice.h>

BLEServer *pServer = NULL;
BLECharacteristic * pTxCharacteristic;
bool deviceConnected = false;
bool oldDeviceConnected = false;
uint8_t txValue = 0;

// See the following for generating UUIDs:
// https://www.uuidgenerator.net/

#define SERVICE_UUID           "6E400001-B5A3-F393-E0A9-E50E24DCCA9E" // UART service UUID
#define CHARACTERISTIC_UUID_RX "6E400002-B5A3-F393-E0A9-E50E24DCCA9E"
#define CHARACTERISTIC_UUID_TX "6E400003-B5A3-F393-E0A9-E50E24DCCA9E"


/**  None of these are required as they will be handled by the library with defaults. **
 **                       Remove as you see fit for your needs                        */  
class MyServerCallbacks: public BLEServerCallbacks {
    void onConnect(BLEServer* pServer) {
      deviceConnected = true;
    };

    void onDisconnect(BLEServer* pServer) {
      deviceConnected = false;
    }
  /***************** New - Security handled here ********************
  ****** Note: these are the same return values as defaults ********/
    uint32_t onPassKeyRequest(){
      Serial.println("Server PassKeyRequest");
      return 123456; 
    }

    bool onConfirmPIN(uint32_t pass_key){
      Serial.print("The passkey YES/NO number: ");Serial.println(pass_key);
      return true; 
    }

    void onAuthenticationComplete(ble_gap_conn_desc desc){
      Serial.println("Starting BLE work!");
    }
  /*******************************************************************/
};

class MyCallbacks: public BLECharacteristicCallbacks {
    void onWrite(BLECharacteristic *pCharacteristic) {
      std::string rxValue = pCharacteristic->getValue();

      if (rxValue.length() > 0) {
        Serial.println("*********");
        Serial.print("Received Value: ");
        for (int i = 0; i < rxValue.length(); i++)
          Serial.print(rxValue[i]);

        Serial.println();
        Serial.println("*********");
      }
    }
};


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

  // Create the BLE Device
  BLEDevice::init("UART Service");

  // Create the BLE Server
  pServer = BLEDevice::createServer();
  pServer->setCallbacks(new MyServerCallbacks());

  // Create the BLE Service
  BLEService *pService = pServer->createService(SERVICE_UUID);

  // Create a BLE Characteristic
  pTxCharacteristic = pService->createCharacteristic(
                                        CHARACTERISTIC_UUID_TX,
                                    /******* Enum Type NIMBLE_PROPERTY now *******      
                                        BLECharacteristic::PROPERTY_NOTIFY
                                        );
                                    **********************************************/  
                                        NIMBLE_PROPERTY::NOTIFY
                                       );
                                    
  /***************************************************   
   NOTE: DO NOT create a 2902 descriptor 
   it will be created automatically if notifications 
   or indications are enabled on a characteristic.
   
   pCharacteristic->addDescriptor(new BLE2902());
  ****************************************************/                  

  BLECharacteristic * pRxCharacteristic = pService->createCharacteristic(
                                            CHARACTERISTIC_UUID_RX,
                                    /******* Enum Type NIMBLE_PROPERTY now *******       
                                            BLECharacteristic::PROPERTY_WRITE
                                            );
                                    *********************************************/  
                                            NIMBLE_PROPERTY::WRITE
                                            );

  pRxCharacteristic->setCallbacks(new MyCallbacks());

  // Start the service
  pService->start();

  // Start advertising
  pServer->getAdvertising()->start();
  Serial.println("Waiting a client connection to notify...");
}

void loop() {

    if (deviceConnected) {
        pTxCharacteristic->setValue(&txValue, 1);
        pTxCharacteristic->notify();
        txValue++;
        delay(10); // bluetooth stack will go into congestion, if too many packets are sent
    }

    // disconnecting
    if (!deviceConnected && oldDeviceConnected) {
        delay(500); // give the bluetooth stack the chance to get things ready
        pServer->startAdvertising(); // restart advertising
        Serial.println("start advertising");
        oldDeviceConnected = deviceConnected;
    }
    // connecting
    if (deviceConnected && !oldDeviceConnected) {
        // do stuff here on connecting
        oldDeviceConnected = deviceConnected;
    }
}

LCD Display 

• i2c 통신 
• 동작확인

 

Sourcecode

• [ Arduino Library ] ESP32_Check_availablePins_20210614.ino

 

참조사이트

ESP32 특징 및 환경설정	https://postpop.tistory.com/15
ES32 온습도 센싱	https://www.burndogfather.com/214

 

I2C 스캔테스트

https://juahnpop.tistory.com/96