Unit Mini BPS Arduino User Guide

#include <M5Unified.h>
#include "M5UnitENV.h"

M5Canvas canvas(&M5.Display);

// #define USING_BPS
#define USING_BPS_V11

#if defined(USING_BPS)

BMP280 bmp;

#elif defined(USING_BPS_V11)

QMP6988 qmp;

#endif

float calculate_altitude(const float pressure, const float seaLvhPa = 1013.25f)
{
    return 44330.f * (1.0f - pow((pressure / 100.f) / seaLvhPa, 0.1903f));
}

void setup()
{
    M5.begin();
    Serial.begin(115200);
    M5.Display.setFont(&fonts::lgfxJapanMinchoP_20);
    M5.Display.setTextSize(1);
    auto pin_num_sda = M5.getPin(m5::pin_name_t::port_a_sda);
    auto pin_num_scl = M5.getPin(m5::pin_name_t::port_a_scl);
    M5_LOGI("getPin: SDA:%u SCL:%u", pin_num_sda, pin_num_scl);

    Wire.begin(pin_num_sda, pin_num_scl, 400000U);

#if defined(USING_BPS)
    if (!bmp.begin(&Wire, BMP280_I2C_ADDR, pin_num_sda, pin_num_scl, 400000U)) {
        Serial.println("Couldn't find BMP280");
        M5.Display.clear(TFT_RED);
        while (1) delay(1);
    }
    /* Default settings from datasheet. */
    bmp.setSampling(BMP280::MODE_NORMAL,     /* Operating Mode. */
                    BMP280::SAMPLING_X2,     /* Temp. oversampling */
                    BMP280::SAMPLING_X16,    /* Pressure oversampling */
                    BMP280::FILTER_X16,      /* Filtering. */
                    BMP280::STANDBY_MS_500); /* Standby time. */

#elif defined(USING_BPS_V11)
    if (!qmp.begin(&Wire, QMP6988_SLAVE_ADDRESS_L, pin_num_sda, pin_num_scl, 400000U)) {
        Serial.println("Couldn't find QMP6988");
        M5.Display.clear(TFT_RED);
        while (1) delay(1);
    }

#endif
}

void loop()
{
    M5.update();

#if defined(USING_BPS)

    if (bmp.update()) {
        M5.Display.setCursor(0, 0);
        M5.Display.clear(TFT_BLACK);
        M5.Display.println("-----BMP280-----");
        M5.Display.print(F("Temperature: "));
        M5.Display.print(bmp.cTemp);
        M5.Display.println(" degrees C");
        M5.Display.print(F("Pressure: "));
        M5.Display.print(bmp.pressure);
        M5.Display.println(" Pa");
        M5.Display.print(F("Approx altitude: "));
        M5.Display.print(bmp.altitude);
        M5.Display.println(" m");
        M5.Display.println("-------------\r\n");
    }

#elif defined(USING_BPS_V11)

    if (qmp.update()) {
        M5.Display.setCursor(0, 0);
        M5.Display.clear(TFT_BLACK);
        M5.Display.println("-----QMP6988-----");
        M5.Display.print(F("Temperature: "));
        M5.Display.print(qmp.cTemp);
        M5.Display.println(" *C");
        M5.Display.print(F("Pressure: "));
        M5.Display.print(qmp.pressure);
        M5.Display.println(" Pa");
        M5.Display.print(F("Approx altitude: "));
        M5.Display.print(qmp.altitude);
        M5.Display.println(" m");
        M5.Display.println("-------------\r\n");
    }

#endif
    delay(1000);
}