Sketch of simple meteorological observatory for Ambient using M5AtomLite and BME280, SHT30 https://qiita.com/hotstaff/items/9daa331c923339072f3e

env2-m5atom.ino

/******************************************************************************/
//  Function:    Sends temperature, humidity, and atmospheric pressure
//               to the IoT visualization service (Ambient)
//  Usage:       Write via Arduino IDE
//  Hardware:    M5AtomLite and ENV.2 Unit
//  Arduino IDE: Arduino-1.8.13
//  Author:  Hideto Manjo
//  Date:    Oct 10, 2020
//  Version: v0.1
//
//  This program is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation; either
//  version 2.1 of the License, or (at your option) any later version.
//  This library is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
//  Lesser General Public License for more details.
//  You should have received a copy of the GNU Lesser General Public
//  License along with this library; if not, write to the Free Software
//  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
//
/******************************************************************************/
#include <M5Atom.h>
#include <Wire.h>
#include <Adafruit_BMP280.h>
#include <Adafruit_SHT31.h>
#include <Ambient.h>

// sensor
#define TIME_TO_SLEEP 300
#define PRESSURE_LOWB 750 //hPa

// WiFi
#define SSID "ssid"
#define PASSWORD "password"
#define RETRY 20

// Ambient
#define CHANNELID 00000
#define WRITEKEY "whitekey"

Adafruit_SHT31 sht3x;
Adafruit_BMP280 bme;

WiFiClient client;
Ambient ambient;

bool connect_wifi() {
    int i = RETRY;
    WiFi.begin(SSID, PASSWORD);
    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print(".");
        if (!i--) {
            Serial.println("Could not connect to WiFi");
            return false;
        }
    }
    Serial.print("WiFi connected\r\nIP address: ");
    Serial.println(WiFi.localIP());
    return true;
}

void setup() {
    M5.begin();
    Wire.begin(26, 32);
    while (!bme.begin(0x76)) {
        Serial.println("BMP280 init fail");
    }
    while (!sht3x.begin(0x44)) {
        Serial.println("SHT3x init fail");
    }

    float tmp = sht3x.readTemperature();
    float hum = sht3x.readHumidity();

    // Since bme280 often returns an incorrect pressure value,
    // we set a lower limit.
    float pressure = 0.0;
    do {
        pressure = bme.readPressure();
    }while(pressure < PRESSURE_LOWB * 100);

    Serial.printf("temp: %4.1f'C\r\n", tmp);
    Serial.printf("humid:%4.1f%%\r\n", hum);
    Serial.printf("press:%4.0fhPa\r\n", pressure / 100);

    if (connect_wifi()) {
        ambient.begin(CHANNELID, WRITEKEY, &client);

        ambient.set(1, tmp);
        ambient.set(2, hum);
        ambient.set(3, pressure / 100);

        if (ambient.send()) {
            Serial.println("The data was successfully sent to the ambient");
        }else{
            Serial.println("Failed to send data to ambient");
        }
    }

    esp_deep_sleep(TIME_TO_SLEEP * 1000000);
}

void loop() {
}