Initial commit for dht11-lcd example.

esp/cpp/08_dht11-lcd/CMakeLists.txt

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+# For more information about build system see
+# https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/build-system.html
+# The following five lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.26)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+
+project(
+    #[[NAME]]   aht20
+    VERSION     0.1
+    DESCRIPTION "Using the AHT20 sensor with ESP-IDF over I2C"
+    LANGUAGES   CXX
+)
+message(STATUS "[Klips] Configuring example: ${PROJECT_NAME}")
+# For writing pure cmake components, see the documentation
+# https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-guides/build-system.html#writing-pure-cmake-components
+idf_build_set_property(COMPILE_OPTIONS "-Wno-error" APPEND)

esp/cpp/08_dht11-lcd/README.md

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+# 08_dht11-lcd
+
+Using the ESP IDF for reading data from a DHT11 sensor and displaying it on an LCD.
+
+[ESP IDF - I2C](https://docs.espressif.com/projects/esp-idf/en/v5.3.2/esp32/api-reference/peripherals/i2c.html)
+
+[ESP IDF - LCD](https://docs.espressif.com/projects/esp-idf/en/v5.3.2/esp32/api-reference/peripherals/lcd/index.html)
+
+[ESP IDF - FreeRTOS](https://docs.espressif.com/projects/esp-idf/en/v5.3.2/esp32/api-reference/system/freertos.html)
+
+![schematic](./schematic.png)
+
+![example](./example.gif)
+
+For instructions on setting up the ESP-IDF see [04_-esp-idf-arduino](./../04_esp-idf-arduino)
+
+To build this example run the following commands.
+
+```bash
+source ~/path/to/esp-idf/export.sh
+
+mkdir build
+cd build
+cmake ..
+make -j $(nproc)
+make flash
+```

esp/cpp/08_dht11-lcd/main/CMakeLists.txt

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+idf_component_register(
+    SRCS
+    main.cpp
+    main.h i2c.h
+    INCLUDE_DIRS .
+    REQUIRES driver
+)

esp/cpp/08_dht11-lcd/main/idf_component.yml

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+## IDF Component Manager Manifest File
+dependencies:
+  idf: '>=5.3.0'

esp/cpp/08_dht11-lcd/main/main.cpp

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+/*#############################################################################
+## Author: Shaun Reed                                                        ##
+## Legal: All Content (c) 2025 Shaun Reed, all rights reserved               ##
+##                                                                           ##
+## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com                     ##
+##############################################################################
+*/
+
+#include "i2c.h"
+
+// Pin may vary based on your schematic.
+#define PIN_SDA                GPIO_NUM_21
+#define PIN_SCL                GPIO_NUM_22
+#define PIN_RST                (-1)
+
+I2C i2c(PIN_SDA, PIN_SCL, PIN_RST);
+
+extern "C" void app_main(void)
+{
+
+
+}

esp/cpp/08_dht11-lcd/main/main.h

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+/*#############################################################################
+## Author: Shaun Reed                                                        ##
+## Legal: All Content (c) 2025 Shaun Reed, all rights reserved               ##
+##                                                                           ##
+## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com                     ##
+##############################################################################
+*/
+#include "display.h"
+#include "ssd1306.h"
+
+// Pin may vary based on your schematic.
+#define PIN_SDA                GPIO_NUM_21
+#define PIN_SCL                GPIO_NUM_22
+#define PIN_RST                (-1)
+
+I2C i2c(PIN_SDA, PIN_SCL, PIN_RST);
+
+extern "C" void app_main(void)
+{
+  SSD1306 ssd1306(i2c);
+  Display d(ssd1306);
+
+  d.set_text("Test test 12345678910",
+             "test-text1",
+             LV_LABEL_LONG_SCROLL,
+             LV_ALIGN_CENTER);
+
+  d.set_text("Test test changing text",
+             "test-text1",
+             LV_LABEL_LONG_SCROLL,
+             LV_ALIGN_CENTER);
+
+  d.set_text("Hello hello hello hello hello hello hello hello!", "test-text2");
+
+  d.set_text("A random sentence with no meaning at all.",
+             "test-text3",
+             LV_LABEL_LONG_CLIP,
+             LV_ALIGN_BOTTOM_MID);
+}

esp/cpp/components/i2c.h

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+/*#############################################################################
+## Author: Shaun Reed                                                        ##
+## Legal: All Content (c) 2025 Shaun Reed, all rights reserved               ##
+##                                                                           ##
+## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com                     ##
+##############################################################################
+*/
+#ifndef I2C_H
+#define I2C_H
+
+#define I2C_BUS_PORT  0
+
+#include <esp_log.h>
+#include <driver/i2c_master.h>
+
+/**
+ * Encapsulates ESP I2C creation and usage.
+ */
+struct I2C {
+  /**
+   * Construct and initialize an ESP I2C master bus.
+   * An I2C constructor may only be called one time in any application.
+   *
+   * @param sda GPIO pin number for SDA
+   * @param scl GPIO pin number for SCL
+   * @param rst GPIO pin number for RST
+   */
+  I2C(gpio_num_t sda, gpio_num_t scl, int rst = -1) :
+      I2C((i2c_master_bus_config_t) {
+              .i2c_port = I2C_BUS_PORT,
+              .sda_io_num = sda,
+              .scl_io_num = scl,
+              .clk_source = I2C_CLK_SRC_DEFAULT,
+              .glitch_ignore_cnt = 7,
+              .flags {
+                  .enable_internal_pullup = true,
+              },
+          },
+          rst
+      ) { }
+
+  /**
+   * Construct an ESP I2C master bus given a specific ESP I2C configuration.
+   * An I2C constructor may only be called one time in any application.
+   *
+   * @param config ESP I2C master bus configuration.
+   * @param rst GPIO pin number for RST
+   */
+  explicit I2C(i2c_master_bus_config_t config, int rst = -1) :
+      esp_bus_config_(config),
+      rst_num_(rst)
+  {
+    i2c_master_bus_handle_t i2c;
+    ESP_LOGI(TAG, "Initializing new master I2C bus");
+    ESP_ERROR_CHECK(i2c_new_master_bus(&esp_bus_config_, &i2c));
+  }
+
+  ~I2C() = default;
+
+  //
+  // GETTERS
+
+  /**
+   * ESP I2C master bus handle getter.
+   * This will fail if an I2C instance was never constructed.
+   */
+  static i2c_master_bus_handle_t get()
+  {
+    i2c_master_bus_handle_t i2c = nullptr;
+    ESP_ERROR_CHECK(i2c_master_get_bus_handle(0, &i2c));
+    return i2c;
+  }
+
+  //
+  // PUBLIC MEMBERS
+
+  /// ESP I2C master bus configuration used during initialization.
+  i2c_master_bus_config_t esp_bus_config_;
+
+  /// RST GPIO pin number.
+  int rst_num_;
+
+private:
+
+  //
+  // PRIVATE MEMBERS
+
+  /// Tag used for ESP logging.
+  constexpr static const char *TAG = "I2C";
+};
+
+#endif //I2C_H