m5stick-paxcounter.ino

#include <M5StickC.h>
#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEScan.h>

int deviceCount = 0;

class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks {
  void onResult(BLEAdvertisedDevice advertisedDevice) {
    deviceCount++;
  }
};

void setup() {
  M5.begin();
  BLEDevice::init("");
  BLEScan* pBLEScan = BLEDevice::getScan();
  pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
  pBLEScan->setActiveScan(true);
  pBLEScan->start(5);
}

void loop() {
  M5.update();
  M5.Lcd.setCursor(0, 0);
  M5.Lcd.fillScreen(TFT_BLACK);
  M5.Lcd.setTextFont(2);
  M5.Lcd.setTextSize(1);
  M5.Lcd.setTextColor(TFT_GREEN, TFT_BLACK);

  // Get the battery voltage and calculate the remaining percentage
  float voltage = M5.Axp.GetBatVoltage();
  int percentage = map(voltage, 3.0, 4.2, 0, 100);

  M5.Lcd.printf("Bluetooth: \r\n %d \r\n \r\n Battery: \r\n %d%%", deviceCount, percentage);
  delay(1000);
}