Add BME280 Test Project

.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

.vscode/extensions.json

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+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

lib/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in a an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:esp32doit-devkit-v1]
+platform = espressif32
+board = esp32doit-devkit-v1
+framework = arduino
+lib_deps = adafruit/Adafruit BME280 Library@^2.2.2

src/main.cpp

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+#include <Arduino.h>
+/***************************************************************************
+  This is a library for the BME280 humidity, temperature & pressure sensor
+
+  Designed specifically to work with the Adafruit BME280 Breakout
+  ----> http://www.adafruit.com/products/2650
+
+  These sensors use I2C or SPI to communicate, 2 or 4 pins are required
+  to interface. The device's I2C address is either 0x76 or 0x77.
+
+  Adafruit invests time and resources providing this open source code,
+  please support Adafruit andopen-source hardware by purchasing products
+  from Adafruit!
+
+  Written by Limor Fried & Kevin Townsend for Adafruit Industries.
+  BSD license, all text above must be included in any redistribution
+  See the LICENSE file for details.
+ ***************************************************************************/
+
+#include <Wire.h>
+#include <SPI.h>
+#include <Adafruit_Sensor.h>
+#include <Adafruit_BME280.h>
+
+#define BME_SCK 13
+#define BME_MISO 12
+#define BME_MOSI 11
+#define BME_CS 10
+
+#define SEALEVELPRESSURE_HPA (1013.25)
+
+Adafruit_BME280 bme; // I2C
+//Adafruit_BME280 bme(BME_CS); // hardware SPI
+//Adafruit_BME280 bme(BME_CS, BME_MOSI, BME_MISO, BME_SCK); // software SPI
+
+unsigned long delayTime;
+
+void printValues();
+
+void setup() {
+    Serial.begin(9600);
+    while(!Serial);    // time to get serial running
+    Serial.println(F("BME280 test"));
+
+    unsigned status;
+    
+    // default settings
+    status = bme.begin(0x76);  
+    // You can also pass in a Wire library object like &Wire2
+    // status = bme.begin(0x76, &Wire2)
+    if (!status) {
+        Serial.println("Could not find a valid BME280 sensor, check wiring, address, sensor ID!");
+        Serial.print("SensorID was: 0x"); Serial.println(bme.sensorID(),16);
+        Serial.print("        ID of 0xFF probably means a bad address, a BMP 180 or BMP 085\n");
+        Serial.print("   ID of 0x56-0x58 represents a BMP 280,\n");
+        Serial.print("        ID of 0x60 represents a BME 280.\n");
+        Serial.print("        ID of 0x61 represents a BME 680.\n");
+        while (1) delay(10);
+    }
+    
+    Serial.println("-- Default Test --");
+    delayTime = 1000;
+
+    Serial.println();
+}
+
+
+void loop() { 
+    printValues();
+    delay(delayTime);
+}
+
+
+void printValues() {
+    Serial.print("Temperature = ");
+    Serial.print(bme.readTemperature());
+    Serial.println(" °C");
+
+    Serial.print("Pressure = ");
+
+    Serial.print(bme.readPressure() / 100.0F);
+    Serial.println(" hPa");
+
+    Serial.print("Approx. Altitude = ");
+    Serial.print(bme.readAltitude(SEALEVELPRESSURE_HPA));
+    Serial.println(" m");
+
+    Serial.print("Humidity = ");
+    Serial.print(bme.readHumidity());
+    Serial.println(" %");
+
+    Serial.println();
+}

test/README

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+
+This directory is intended for PlatformIO Test Runner and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/en/latest/advanced/unit-testing/index.html