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Libreria universale per dimmer con ESP32. Guida al framework ESP-IDF in C ed esempi.

Prima di iniziare, leggere la panoramica della libreria: Libreria universale per ESP32

Info

Scarica la libreria da GitHub: rbdimmerESP32

Installazione

Con CMake ed ESP-IDF

Scaricare la libreria rbdimmerESP32 dal repository GitHub:

bash

git clone https://github.com/your-username/rbdimmerESP32 components/rbdimmer

Configure your project's CMakeLists.txt to include the library:

cmake

# Main project CMakeLists.txt
cmake_minimum_required(VERSION 3.5)

include($ENV{IDF_PATH}/tools/cmake/project.cmake)
project(your_project_name)

Add component dependency in your application's CMakeLists.txt:

cmake

# App CMakeLists.txt
idf_component_register(
    SRCS "main.c"
    INCLUDE_DIRS "."
    REQUIRES rbdimmer
)

Creare un file CMakeLists.txt nella directory del componente rbdimmer:

cmake

# components/rbdimmer/CMakeLists.txt
idf_component_register(
    SRCS "rbdimmerESP32.c"
    INCLUDE_DIRS "include"
    REQUIRES driver esp_timer freertos
)

Collegamento hardware

Istruzioni per collegare il dimmer al microcontrollore e al carico AC:

Collegare il pin Zero-Cross a qualsiasi GPIO con funzionalità ISR. Consultare la documentazione del proprio chip ESP32
Collegare il pin Dimmer a qualsiasi GPIO
VCC a 3,3 V (per ESP32, VCC = 3,3 V)
GND a GND

Info

Per guide dettagliate al collegamento hardware, fare riferimento a: Collegamento hardware

Esempio di base (ESP-IDF / C)

#include 
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_log.h"
#include "rbdimmerESP32.h"

static const char *TAG = "DIMMER_EXAMPLE";

// Pins
#define ZERO_CROSS_PIN  18   // Zero-Cross pin
#define DIMMER_PIN      19   // Dimming control pin
#define PHASE_NUM       0    // Phase N (0 for single phase)

// Global variables. Dimmer object
rbdimmer_channel_t* dimmer_channel = NULL;

void app_main(void)
{
    ESP_LOGI(TAG, "AC Dimmer Test");

    // Dimmer lib init
    if (rbdimmer_init() != RBDIMMER_OK) {
        ESP_LOGE(TAG, "Failed to initialize AC Dimmer library");
        return;
    }

    // Zero-cross detector and phase registry
    if (rbdimmer_register_zero_cross(ZERO_CROSS_PIN, PHASE_NUM, 0) != RBDIMMER_OK) {
        ESP_LOGE(TAG, "Failed to register zero-cross detector");
        return;
    }

    // Dimmer channel. Configuration data structure.
    rbdimmer_config_t config_channel = {
        .gpio_pin = DIMMER_PIN,
        .phase = PHASE_NUM,
        .initial_level = 50,  // Initial dimming level 50%
        .curve_type = RBDIMMER_CURVE_RMS  // Level Curve Selection. RMS-curve
    };

    if (rbdimmer_create_channel(&config_channel, &dimmer_channel) != RBDIMMER_OK) {
        ESP_LOGE(TAG, "Failed to create dimmer channel");
        return;
    }

    ESP_LOGI(TAG, "AC Dimmer initialized successfully");

    // Main loop
    while (1) {
        // dimming from 10% to 90% with step 10
        for (int brightness = 10; brightness <= 90; brightness += 10) {
            ESP_LOGI(TAG, "Setting brightness to %d%%", brightness);
            rbdimmer_set_level(dimmer_channel, brightness);
            vTaskDelay(2000 / portTICK_PERIOD_MS);
        }

        // Smooth transition from current level to 0 level in 5 sec
        ESP_LOGI(TAG, "Smooth transition to 0%%");
        rbdimmer_set_level_transition(dimmer_channel, 0, 5000);
        vTaskDelay(6000 / portTICK_PERIOD_MS); // delay 6 sec

        // Smooth transition from current level (0) to 100 level in 5 sec
        ESP_LOGI(TAG, "Smooth transition to 100%%");
        rbdimmer_set_level_transition(dimmer_channel, 100, 5000);
        vTaskDelay(6000 / portTICK_PERIOD_MS); // delay 6 sec
    }
}

Riferimento API

Funzionamento della libreria

Preparazione:

Inizializzare la libreria con rbdimmer_init()
Registrare il rilevatore di passaggio per lo zero con rbdimmer_register_zero_cross()
Creare un canale dimmer con rbdimmer_create_channel()

Controllo della dimmerizzazione:

Impostazione del livello di dimmerizzazione con rbdimmer_set_level(). Il livello è impostato nell'intervallo 0 (spento) ~ 100 (acceso)
Transizione fluida del livello con rbdimmer_set_level_transition(). Transizione graduale dal livello attuale al livello impostato in un periodo di tempo (in millisecondi, 1 s = 1000 ms)

Info

Per una spiegazione dettagliata del funzionamento dei dimmer, visitare: Principi di funzionamento del dimmer AC

Strutture dati

rbdimmer_config_t

typedef struct {
    uint8_t gpio_pin;                 // Dimmer GPIO
    uint8_t phase;                    // Phase number
    uint8_t initial_level;            // Initial dimming level
    rbdimmer_curve_t curve_type;      // Level Curve type
} rbdimmer_config_t;

Enumerazioni

rbdimmer_curve_t

Tipi di curve di livello:

typedef enum {
    RBDIMMER_CURVE_LINEAR,      // Linear curve
    RBDIMMER_CURVE_RMS,         // RMS-compensated curve (for incandescent bulbs)
    RBDIMMER_CURVE_LOGARITHMIC  // Logarithmic curve (for dimmable LED)
} rbdimmer_curve_t;

rbdimmer_err_t

Risposte delle funzioni della libreria:

typedef enum {
    RBDIMMER_OK = 0,            // Successful execution
    RBDIMMER_ERR_INVALID_ARG,   // Invalid argument
    RBDIMMER_ERR_NO_MEMORY,     // Not enough memory
    RBDIMMER_ERR_NOT_FOUND,     // Object not found
    RBDIMMER_ERR_ALREADY_EXIST, // Object already exists
    RBDIMMER_ERR_TIMER_FAILED,  // Timer initialization error
    RBDIMMER_ERR_GPIO_FAILED    // GPIO initialization error
} rbdimmer_err_t;

Costanti e macro

Costanti nel file rbdimmerESP32.h. È possibile modificare questi parametri:

#define RBDIMMER_MAX_PHASES 4                 // Maximum number of phases
#define RBDIMMER_MAX_CHANNELS 8               // Maximum number of channels
#define RBDIMMER_DEFAULT_PULSE_WIDTH_US 50    // Pulse width (us)
#define RBDIMMER_MIN_DELAY_US 50              // Minimum delay (us)

Warning

Non è consigliabile modificare RBDIMMER_DEFAULT_PULSE_WIDTH_US, poiché è correlato alle caratteristiche hardware del dimmer.

Funzioni

Inizializzazione e configurazione

// Initialize the library
rbdimmer_err_t rbdimmer_init(void);

// Register a zero-cross detector
rbdimmer_err_t rbdimmer_register_zero_cross(uint8_t pin, uint8_t phase, uint16_t frequency);

// Create a dimmer channel
rbdimmer_err_t rbdimmer_create_channel(rbdimmer_config_t* config, rbdimmer_channel_t** channel);

// Set callback function for zero-cross events
rbdimmer_err_t rbdimmer_set_callback(uint8_t phase, void (*callback)(void*), void* user_data);

Controllo della dimmerizzazione

// Set dimming level
rbdimmer_err_t rbdimmer_set_level(rbdimmer_channel_t* channel, uint8_t level_percent);

// Set brightness with smooth transition
rbdimmer_err_t rbdimmer_set_level_transition(rbdimmer_channel_t* channel, uint8_t level_percent, uint32_t transition_ms);

// Set brightness curve type
rbdimmer_err_t rbdimmer_set_curve(rbdimmer_channel_t* channel, rbdimmer_curve_t curve_type);

// Activate/deactivate channel
rbdimmer_err_t rbdimmer_set_active(rbdimmer_channel_t* channel, bool active);

Interrogazioni informative

// Get current channel brightness
uint8_t rbdimmer_get_level(rbdimmer_channel_t* channel);

// Get measured mains frequency for the specified phase
uint16_t rbdimmer_get_frequency(uint8_t phase);

// Check if channel is active
bool rbdimmer_is_active(rbdimmer_channel_t* channel);

// Get channel curve type
rbdimmer_curve_t rbdimmer_get_curve(rbdimmer_channel_t* channel);

// Get current channel delay
uint32_t rbdimmer_get_delay(rbdimmer_channel_t* channel);

Guida passo-passo

Struttura del progetto

text

your_project/
├── CMakeLists.txt
├── main/
│   ├── CMakeLists.txt
│   └── main.c
└── components/
    └── rbdimmer/
        ├── CMakeLists.txt
        ├── include/
        │   └── rbdimmer.h
        └── rbdimmerESP32.c

Passi di implementazione

Definire la libreria e i pin nel file main.c:

#include "rbdimmer.h"

// Pins
#define ZERO_CROSS_PIN  18   // Zero-Cross pin
#define DIMMER_PIN      19   // Dimming control pin
#define PHASE_NUM       0    // Phase N (0 for single phase)

Creare l'oggetto dimmer (uno per ogni dimmer):

rbdimmer_channel_t* dimmer_channel = NULL;

Inizializzare la libreria dimmer:

rbdimmer_init();

Registrare il rilevatore di passaggio per lo zero e la fase:

rbdimmer_register_zero_cross(ZERO_CROSS_PIN, PHASE_NUM, 0);

Configurare e creare il canale dimmer:

rbdimmer_config_t config_channel = {
    .gpio_pin = DIMMER_PIN,
    .phase = PHASE_NUM,
    .initial_level = 50,  // Initial dimming level 50%
    .curve_type = RBDIMMER_CURVE_RMS  // Level Curve Selection. RMS-curve
};

rbdimmer_create_channel(&config_channel, &dimmer_channel);

Controllare la dimmerizzazione:

// Set specific level
rbdimmer_set_level(dimmer_channel, level);

// Smooth transition
rbdimmer_set_level_transition(dimmer_channel, 0, 5000);

Tip

La funzione di transizione fluida crea una transizione suddividendola in più piccoli passi tramite un task FreeRTOS. Durante la transizione, il codice principale continua a essere eseguito.

Esempi avanzati

Sistemi dimmer multicanale

#include 
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_log.h"
#include "rbdimmer.h"

#define ZERO_CROSS_PIN  18
#define DIMMER_PIN_1    19
#define DIMMER_PIN_2    21
#define PHASE_NUM       0

static const char *TAG = "DIMMER_EXAMPLE";
rbdimmer_channel_t* channel1 = NULL;
rbdimmer_channel_t* channel2 = NULL;

void app_main(void)
{
    // Initialize library
    rbdimmer_init();

    // Register zero-cross detector (one per phase)
    rbdimmer_register_zero_cross(ZERO_CROSS_PIN, PHASE_NUM, 0);

    // Create first channel (incandescent bulbs)
    rbdimmer_config_t config1 = {
        .gpio_pin = DIMMER_PIN_1,
        .phase = PHASE_NUM,
        .initial_level = 50,
        .curve_type = RBDIMMER_CURVE_RMS
    };
    rbdimmer_create_channel(&config1, &channel1);

    // Create second channel (dimmable LED lighting)
    rbdimmer_config_t config2 = {
        .gpio_pin = DIMMER_PIN_2,
        .phase = PHASE_NUM,
        .initial_level = 50,
        .curve_type = RBDIMMER_CURVE_LOGARITHMIC
    };
    rbdimmer_create_channel(&config2, &channel2);

    // Main control loop
    while (1) {
        // Control channels independently
        rbdimmer_set_level(channel1, 75);
        rbdimmer_set_level(channel2, 25);
        vTaskDelay(2000 / portTICK_PERIOD_MS);

        rbdimmer_set_level(channel1, 25);
        rbdimmer_set_level(channel2, 75);
        vTaskDelay(2000 / portTICK_PERIOD_MS);
    }
}

Utilizzo delle funzioni callback di interrupt del passaggio per lo zero

#include 
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/queue.h"
#include "driver/gpio.h"
#include "esp_log.h"
#include "rbdimmer.h"

#define ZERO_CROSS_PIN  18
#define DIMMER_PIN      19
#define LED_PIN         2  // Built-in LED for zero-cross visualization
#define PHASE_NUM       0

static const char *TAG = "DIMMER_CALLBACK";
rbdimmer_channel_t* dimmer = NULL;
QueueHandle_t zero_cross_queue;

// Simple message for our queue
typedef struct {
    uint32_t timestamp;
} ZeroCrossEvent_t;

// Callback function for zero-cross events
void zero_cross_callback(void* arg)
{
    ZeroCrossEvent_t event;
    event.timestamp = esp_timer_get_time() / 1000; // Current time in ms

    // Send to queue from ISR
    BaseType_t higher_priority_task_woken = pdFALSE;
    xQueueSendFromISR(zero_cross_queue, &event, &higher_priority_task_woken);

    if (higher_priority_task_woken) {
        portYIELD_FROM_ISR();
    }
}

// Task to process zero-cross events
void zero_cross_processing_task(void *pvParameters)
{
    ZeroCrossEvent_t event;

    while (1) {
        if (xQueueReceive(zero_cross_queue, &event, portMAX_DELAY)) {
            // Toggle LED to visualize zero-crossing
            gpio_set_level(LED_PIN, !gpio_get_level(LED_PIN));

            // Additional processing can be done here safely
            ESP_LOGI(TAG, "Zero-cross event at time: %lu ms", event.timestamp);
        }
    }
}

void app_main(void)
{
    // Setup LED
    gpio_reset_pin(LED_PIN);
    gpio_set_direction(LED_PIN, GPIO_MODE_OUTPUT);

    // Create the queue
    zero_cross_queue = xQueueCreate(10, sizeof(ZeroCrossEvent_t));
    if (zero_cross_queue == NULL) {
        ESP_LOGE(TAG, "Failed to create queue");
        return;
    }

    // Create the task to process zero-cross events
    BaseType_t task_created = xTaskCreate(
        zero_cross_processing_task,
        "ZeroCrossTask",
        2048,
        NULL,
        5,
        NULL
    );

    if (task_created != pdPASS) {
        ESP_LOGE(TAG, "Failed to create task");
        return;
    }

    // Initialize dimmer
    rbdimmer_init();
    rbdimmer_register_zero_cross(ZERO_CROSS_PIN, PHASE_NUM, 0);

    // Register callback
    rbdimmer_set_callback(PHASE_NUM, zero_cross_callback, NULL);

    // Create dimmer channel
    rbdimmer_config_t config = {
        .gpio_pin = DIMMER_PIN,
        .phase = PHASE_NUM,
        .initial_level = 60,
        .curve_type = RBDIMMER_CURVE_RMS
    };

    rbdimmer_create_channel(&config, &dimmer);
    ESP_LOGI(TAG, "Dimmer with callback initialized");

    // Main loop - print frequency information
    while (1) {
        uint16_t frequency = rbdimmer_get_frequency(PHASE_NUM);
        ESP_LOGI(TAG, "Detected frequency: %u Hz", frequency);
        vTaskDelay(1000 / portTICK_PERIOD_MS);
    }
}

Sistemi multifase

#include 
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_log.h"
#include "rbdimmer.h"

#define ZERO_CROSS_PIN_PHASE_A  18
#define ZERO_CROSS_PIN_PHASE_B  19
#define ZERO_CROSS_PIN_PHASE_C  21

#define DIMMER_PIN_PHASE_A      22
#define DIMMER_PIN_PHASE_B      23
#define DIMMER_PIN_PHASE_C      25

#define PHASE_A  0
#define PHASE_B  1
#define PHASE_C  2

static const char *TAG = "DIMMER_MULTIPHASE";
rbdimmer_channel_t* channel_a = NULL;
rbdimmer_channel_t* channel_b = NULL;
rbdimmer_channel_t* channel_c = NULL;

void app_main(void)
{
    // Initialize library
    rbdimmer_init();

    // Register zero-cross detectors for each phase
    rbdimmer_register_zero_cross(ZERO_CROSS_PIN_PHASE_A, PHASE_A, 0);
    rbdimmer_register_zero_cross(ZERO_CROSS_PIN_PHASE_B, PHASE_B, 0);
    rbdimmer_register_zero_cross(ZERO_CROSS_PIN_PHASE_C, PHASE_C, 0);

    // Create channels for each phase
    rbdimmer_config_t config_a = {
        .gpio_pin = DIMMER_PIN_PHASE_A,
        .phase = PHASE_A,
        .initial_level = 50,
        .curve_type = RBDIMMER_CURVE_RMS
    };
    rbdimmer_create_channel(&config_a, &channel_a);

    rbdimmer_config_t config_b = {
        .gpio_pin = DIMMER_PIN_PHASE_B,
        .phase = PHASE_B,
        .initial_level = 50,
        .curve_type = RBDIMMER_CURVE_RMS
    };
    rbdimmer_create_channel(&config_b, &channel_b);

    rbdimmer_config_t config_c = {
        .gpio_pin = DIMMER_PIN_PHASE_C,
        .phase = PHASE_C,
        .initial_level = 50,
        .curve_type = RBDIMMER_CURVE_RMS
    };
    rbdimmer_create_channel(&config_c, &channel_c);

    ESP_LOGI(TAG, "Multi-phase dimmer system initialized");

    // Main control loop
    while (1) {
        // Control phases with different levels
        ESP_LOGI(TAG, "Setting phase A: 75%%, phase B: 50%%, phase C: 25%%");
        rbdimmer_set_level(channel_a, 75);
        rbdimmer_set_level(channel_b, 50);
        rbdimmer_set_level(channel_c, 25);
        vTaskDelay(3000 / portTICK_PERIOD_MS);

        ESP_LOGI(TAG, "Setting phase A: 25%%, phase B: 50%%, phase C: 75%%");
        rbdimmer_set_level(channel_a, 25);
        rbdimmer_set_level(channel_b, 50);
        rbdimmer_set_level(channel_c, 75);
        vTaskDelay(3000 / portTICK_PERIOD_MS);
    }
}

Monitoraggio del funzionamento e debug

void print_dimmer_status(rbdimmer_channel_t* channel, uint8_t phase)
{
    ESP_LOGI(TAG, "=== Dimmer Status ===");
    ESP_LOGI(TAG, "Mains frequency: %d Hz", rbdimmer_get_frequency(phase));
    ESP_LOGI(TAG, "Brightness: %d%%", rbdimmer_get_level(channel));
    ESP_LOGI(TAG, "Active: %s", rbdimmer_is_active(channel) ? "Yes" : "No");
    ESP_LOGI(TAG, "Curve type: %d", rbdimmer_get_curve(channel));
    ESP_LOGI(TAG, "Delay: %d us", rbdimmer_get_delay(channel));
    ESP_LOGI(TAG, "====================");
}

Risoluzione dei problemi

If the dimmer doesn't work correctly, check your hardware connections, especially the zero-cross detector
Assicurarsi che il pin di passaggio per lo zero sia collegato a un GPIO che supporti gli interrupt
Utilizzare le funzioni ESP_LOG per monitorare il funzionamento in tempo reale
Per i sistemi multicanale, assicurarsi che ogni canale dimmer abbia un pin GPIO separato
La libreria supporta il rilevamento automatico della frequenza. Se si conosce la frequenza di rete della propria regione (tipicamente 50 Hz o 60 Hz), è possibile impostarla esplicitamente per migliori prestazioni iniziali

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Integrations

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DimmerLink

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GitHub

Guida ESP-IDF ed esempi

Installazione

Con CMake ed ESP-IDF

Collegamento hardware

Esempio di base (ESP-IDF / C)

Riferimento API

Funzionamento della libreria

Strutture dati

rbdimmer_config_t

Enumerazioni

rbdimmer_curve_t

rbdimmer_err_t

Costanti e macro

Funzioni

Inizializzazione e configurazione

Controllo della dimmerizzazione

Interrogazioni informative

Guida passo-passo

Struttura del progetto

Passi di implementazione

Esempi avanzati

Sistemi dimmer multicanale

Utilizzo delle funzioni callback di interrupt del passaggio per lo zero

Sistemi multifase

Monitoraggio del funzionamento e debug

Risoluzione dei problemi