pill_tracker/embedded/main/main.ino

#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEServer.h>

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

#define SERVICE_UUID        "4fafc201-1fb5-459e-8fcc-c5c9c331914b"
#define CHARACTERISTIC_UUID "beb5483e-36e1-4688-b7f5-ea07361b26a8"

#define LED_PIN 2
#define BTN_PIN 5

#define PILL_1_PIN 25
#define PILL_2_PIN 13
#define PILL_3_PIN 12
#define PILL_4_PIN 26
#define PILL_5_PIN 27
#define PILL_6_PIN 14
#define DETECT_PIN 18


int deviceConnected = false;

int waitingForUpdate = 0;


class MyCallbacks: public BLECharacteristicCallbacks {
   void onConnect(BLEServer* pServer) {
      deviceConnected = true;
      Serial.println("device connected");
    };

    void onDisconnect(BLEServer* pServer) {
      deviceConnected = false;
      Serial.println("device disconnected");
    }
    void onWrite(BLECharacteristic *pCharacteristic) {
      std::string value = pCharacteristic->getValue();

      if (value.length() > 0) {
        Serial.print("*********");
        Serial.print(value.c_str());
        Serial.print("-");
        Serial.print(atoi(value.c_str()));
        Serial.print("-");
        if(atoi(value.c_str())==1)
        {
          digitalWrite(LED_PIN,HIGH);
          Serial.print("LEDON");
        }
        else if (atoi(value.c_str())==2)
        {
          digitalWrite(LED_PIN,LOW);
          Serial.print("LEDOFF");
        }
        else if (atoi(value.c_str())==3)
        {
          Serial.print("UPDATE_PILL_TRACK");
          waitingForUpdate = 1;
        }
        else {
          Serial.println();
          Serial.println(atoi(value.c_str()));
          Serial.println();
        }

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

BLECharacteristic *pCharacteristic;
void setup() {
  Serial.begin(115200);
  pinMode(LED_PIN,OUTPUT);

  pinMode(PILL_1_PIN,INPUT_PULLUP);
  pinMode(PILL_2_PIN,INPUT_PULLUP);
  pinMode(PILL_3_PIN,INPUT_PULLUP);
  pinMode(PILL_4_PIN,INPUT_PULLUP);
  pinMode(PILL_5_PIN,INPUT_PULLUP);
  pinMode(PILL_6_PIN,INPUT_PULLUP);

  pinMode(BTN_PIN,INPUT_PULLUP);
  pinMode(DETECT_PIN,INPUT_PULLUP);


  digitalWrite(LED_PIN,LOW);
  Serial.println("1- Download and install an BLE scanner app in your phone");
  Serial.println("2- Scan for BLE devices in the app");
  Serial.println("3- Connect to MyESP32");
  Serial.println("4- Go to CUSTOM CHARACTERISTIC in CUSTOM SERVICE and write something");
  Serial.println("5- See the magic =)");

  BLEDevice::init("PILL_TRACKER");
  BLEServer *pServer = BLEDevice::createServer();

  BLEService *pService = pServer->createService(SERVICE_UUID);

  pCharacteristic= pService->createCharacteristic(
                                         CHARACTERISTIC_UUID,
                                         BLECharacteristic::PROPERTY_READ |
                                         BLECharacteristic::PROPERTY_WRITE |
                                         BLECharacteristic::PROPERTY_NOTIFY
                                       );

  pCharacteristic->setCallbacks(new MyCallbacks());

  pCharacteristic->setValue("Hello World");
  pService->start();

  BLEAdvertising *pAdvertising = pServer->getAdvertising();
  pAdvertising->start();
}
int prevVal = LOW;
int prevVal2 = LOW;

int getPillCount() {
  String bay0Intact = "0";
  String bay1Intact = "0";
  String bay2Intact = "0";
  String bay3Intact = "0";
  String bay4Intact = "0";
  String bay5Intact = "0";
  String result = "7";

  if(digitalRead(DETECT_PIN) == LOW) {
    Serial.println("PROBE_ATTACHED");
    if(digitalRead(PILL_1_PIN) == LOW){bay0Intact = "1";Serial.println("25:FULL");}
    if(digitalRead(PILL_2_PIN) == LOW){bay1Intact = "1";Serial.println("13:FULL");}
    if(digitalRead(PILL_3_PIN) == LOW){bay2Intact = "1";Serial.println("12:FULL");}
    if(digitalRead(PILL_4_PIN) == LOW){bay3Intact = "1";Serial.println("26:FULL");}
    if(digitalRead(PILL_5_PIN) == LOW){bay4Intact = "1";Serial.println("27:FULL");}
    if(digitalRead(PILL_6_PIN) == LOW){bay5Intact = "1";Serial.println("14:FULL");}
    result = result + bay0Intact + bay1Intact + bay2Intact + bay3Intact + bay4Intact + bay5Intact;
    Serial.println("**********RESULT**********");
    Serial.println(result);
    Serial.println("**********RESULT**********");
  }
  else {
    Serial.println("PROBE_DETACHED");
    result = "55";
  }
  Serial.print("#########################################Sending: ");
  Serial.println(result.toInt());
  return result.toInt();
}

void loop() {
  // put your main code here, to run repeatedly:

  int currentVal = digitalRead(BTN_PIN);
  if(currentVal!=prevVal)
  {
    prevVal=currentVal;
    if(currentVal==HIGH)
    {
      int value = 99;
      pCharacteristic->setValue((uint8_t*)&value, 4);
        pCharacteristic->notify();
    }
    else
    {
       int value = 98;
      pCharacteristic->setValue((uint8_t*)&value, 4);
        pCharacteristic->notify();
    }
  }

  if(waitingForUpdate == 1){
    Serial.println("**********************************");
    Serial.println("**************UPDATE AND SEND PILL COUNT********************");
    Serial.println("**********************************");
    waitingForUpdate = 0;
    int value = getPillCount();
    pCharacteristic->setValue((uint8_t*)&value, 4);
    pCharacteristic->notify();
  }
}