First commit and Init

.gitignore

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+# Build
+build/
+
+# VS Code
+.vscode/
+
+# CMake
+CMakeCache.txt
+CMakeFiles/
+cmake_install.cmake
+Makefile
+
+# Compiled output
+*.uf2
+*.elf
+*.bin
+*.hex
+*.map
+*.dis
+
+# Python cache (pico sdk tools)
+__pycache__/
+*.pyc

.gitmodules

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+[submodule "lib/bme280"]
+	path = lib/bme280
+	url = git@github.com:lafftale1999/bme280_driver.git

mein_projekt/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.13)
+
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+# Pico SDK einbinden – MUSS vor project() stehen
+include($ENV{PICO_SDK_PATH}/external/pico_sdk_import.cmake)
+
+project(mein_projekt C CXX ASM)
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 17)
+
+pico_sdk_init()
+
+add_executable(mein_projekt
+    main.cpp
+)
+
+# Standard Ein-/Ausgabe über USB (du siehst printf im Terminal)
+pico_enable_stdio_usb(mein_projekt 1)
+pico_enable_stdio_uart(mein_projekt 0)
+
+# Benötigte Bibliotheken
+target_link_libraries(mein_projekt
+    pico_stdlib
+    pico_cyw43_arch_none
+    hardware_i2c
+)
+
+# Erzeugt .uf2 Datei zum Flashen
+pico_add_extra_outputs(mein_projekt)

mein_projekt/main.cpp

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+#include "hardware/i2c.h"
+#include "pico/stdlib.h"
+#include <cstdio>
+
+void check_i2c() {
+  uint8_t buffer;
+  for (int addr{0x08}; addr < 0x78; addr++) {
+    if (i2c_read_blocking(i2c0, addr, &buffer, 1, false) > 0) {
+      printf("Adresse: %02X\n", addr);
+    }
+  }
+}
+
+int main() {
+  sleep_ms(3000);
+  stdio_init_all();
+  i2c_init(i2c0, 400 * 1000);
+  gpio_set_function(0, GPIO_FUNC_I2C); // SDA
+  gpio_set_function(1, GPIO_FUNC_I2C); // SCL
+  gpio_pull_up(0);
+  gpio_pull_up(1);
+  while (true) {
+    check_i2c();
+  }
+}