Initial commit

.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch
+settings-my-ignore.h

.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"
+    ]
+}

README.md

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+# Ultraschall-Entfernungsmesser mit OLED-Anzeige
+
+Dieses Programm misst Entfernungen mit einem HC-SR04-Ultraschallsensor und zeigt die Werte auf einem SH1106 OLED-Display an. Es wurde für den ESP8266 (NodeMCU) entwickelt und nutzt die U8g2-Bibliothek zur Anzeige.
+
+Ein Projekt zur Visualisierung von Energiedaten von **Tasmota-Messgeräten** mit einem **ESP8266** und einem 1602 LCD.  
+Das Script fragt periodisch zwei Tasmota-Geräte nach ihrer gemessenen Leistung und zeigt diese auf dem Display an.  
+Ein einfacher Energie-Monitor.
+
+## Funktionen
+
+- Misst Entfernungen in Zentimetern (cm).
+
+- Zeigt den gemessenen Wert in großer Schrift auf dem OLED-Display an.
+
+## Hardwareanforderungen
+
+1. ESP8266 NodeMCU
+2. HC-SR04 Ultraschallsensor
+3. SH1106 OLED-Display (128x64 Pixel)
+
+## Anschlüsse
+
+### SH1106 OLED-Display
+
+| Sensor-Pin | ESP8266-Pin |
+|------------|-------------|
+| VCC        | 5V          |
+| GND        | GND         |
+| TRIG       | D6 (GPIO12) |
+| ECHO       | D5 (GPIO14) |
+
+### HC-SR04 Ultraschallsensor
+
+| Display-Pin | ESP8266-Pin |
+|-------------|-------------|
+| VCC         | 5V          |
+| GND         | GND         |
+| SDA         | D2 (GPIO4)  |
+| SCL         | D1 (GPIO5)  |
+
+
+<img src="https://git.gofel.net/Thorsten/esp8266_lcd_energymeter/raw/branch/master/images/image_1.jpg" alt="Projektbild" width="400">
+
+## Installation
+
+1. Bibliotheken installieren:
+Stelle sicher, dass die folgende Bibliothek in deinem platformio.ini-Projekt installiert ist:
+```cpp
+lib_deps =
+    olikraus/U8g2 @ ^2.34.1
+```
+2. Code hochladen:
+  - Kopiere den Code aus der Hauptdatei in dein PlatformIO-Projekt.
+  - Verbinde den ESP8266 mit deinem Computer.
+  - Lade den Code auf den ESP8266 hoch.,
+
+
+## Nutzung
+
+1. Schließe die Hardware gemäß der oben angegebenen Tabelle an.
+2. Starte das Programm.
+3. Beobachte die gemessene Entfernung auf dem OLED-Display.

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 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:nodemcuv2]
+platform = espressif8266
+board = nodemcuv2
+framework = arduino
+upload_speed = 115200
+monitor_speed = 115200
+lib_deps =
+    adafruit/Adafruit SSD1306 @ ^2.5.7
+    adafruit/Adafruit GFX Library @ ^1.11.7
+    adafruit/Adafruit BusIO @ ^1.14.1
+    olikraus/U8g2 @ ^2.34.20

src/main.cpp

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+#include <U8g2lib.h>
+
+#define TRIG_PIN 12
+#define ECHO_PIN 14
+
+#define SOUND_SPEED 0.034
+#define CM_TO_INCH 0.393701
+
+long duration;
+int distanceCm;
+
+// Initialisierung für das Display
+U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/U8X8_PIN_NONE);
+
+void setup() {
+  Serial.begin(115200);
+  pinMode(TRIG_PIN, OUTPUT); // TRIG_PIN als Ausgang
+  pinMode(ECHO_PIN, INPUT);  // ECHO_PIN als Eingang
+
+  u8g2.begin();
+  u8g2.setFont(u8g2_font_logisoso32_tf); // Große Schriftart
+}
+
+void loop() {
+  // Ultraschallsensor auslösen
+  digitalWrite(TRIG_PIN, LOW);
+  delayMicroseconds(2);
+  digitalWrite(TRIG_PIN, HIGH);
+  delayMicroseconds(10);
+  digitalWrite(TRIG_PIN, LOW);
+
+  // Echo-Zeit messen
+  duration = pulseIn(ECHO_PIN, HIGH);
+
+  // Distanz berechnen
+  distanceCm = duration * SOUND_SPEED / 2;
+
+  // Ausgabe im Serial Monitor
+  Serial.print("Distance (cm): ");
+  Serial.println(distanceCm);
+
+  // Anzeige auf dem Display
+  u8g2.clearBuffer();
+  u8g2.setCursor(0, 48); // Textposition für große Schrift
+  u8g2.print(distanceCm);
+  u8g2.print(" cm");
+  u8g2.sendBuffer(); // Buffer an das Display senden
+
+  delay(500);
+}

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