🎉 First WIP-prototype of ESP32 based nightlight

2025-06-09 21:42:35 +02:00 · 2025-06-09 21:42:35 +02:00 · 9972cb5bea
commit 9972cb5bea
parent 43bbdcc34f
6 changed files with 188 additions and 0 deletions
--- a/main/nightlight.c
+++ b/main/nightlight.c
@ -0,0 +1,136 @@
+#include <stdio.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/timers.h"
+#include "driver/gpio.h"
+#include "esp_log.h"
+#include "led_strip.h"
+
+#define LED_STRIP_PIN    2  // WS281x
+#define PIR_PIN          3  // AM312 or other 3,7V compatible PIR sensors
+#define LIGHT_SENSOR_PIN 4  // Digitale light sensor
+#define NUM_LEDS        15  // Number of LEDs on LED strip
+#define TIMEOUT_MS   10000  // Inactivity timeout (10 seconds)
+
+
+static const char *TAG = "NIGHTLIGHT";
+led_strip_handle_t strip;
+TimerHandle_t off_timer;
+TaskHandle_t led_task_handle = NULL;
+
+// Turn off all LEDs
+void turn_off_leds()
+{
+    for (int i = 0; i < NUM_LEDS; i++) {
+        led_strip_set_pixel(strip, i, 0, 0, 0);
+        led_strip_refresh(strip);
+        vTaskDelay(pdMS_TO_TICKS(100));
+    }
+    ESP_LOGI(TAG, "LEDs turned OFF");
+}
+
+// Turn on LEDs
+void turn_on_leds()
+{
+    for (int i = 0; i < NUM_LEDS; i++) {
+        led_strip_set_pixel(strip, i, 255, 7, 0); // red
+        led_strip_refresh(strip);
+        vTaskDelay(pdMS_TO_TICKS(100));
+    }
+    ESP_LOGI(TAG, "LEDs turned ON");
+}
+
+// Timer callback: turns off LED if no motion is detected
+void off_timer_callback(TimerHandle_t xTimer)
+{
+    if (gpio_get_level(PIR_PIN) == 1) {
+        ESP_LOGI(TAG, "Motion still detected. Resetting off timer.");
+        xTimerReset(off_timer, 0);
+    } else {
+        // No motion detected, it's safe to turn off LEDs
+        turn_off_leds();
+    }
+}
+
+// PIR interrupt handler notifies LED task handler
+void IRAM_ATTR pir_isr_handler(void *arg)
+{
+    BaseType_t xHigherPriorityTaskWoken = pdFALSE;
+    vTaskNotifyGiveFromISR(led_task_handle, &xHigherPriorityTaskWoken);
+    portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
+}
+
+// LED task
+void led_task(void *arg)
+{
+    while (1) {
+        // wait for motion
+        ulTaskNotifyTake(pdTRUE, portMAX_DELAY);
+
+        ESP_LOGI(TAG, "Motion detected!");
+
+        // Reset off timer and turn on LEDs
+        xTimerReset(off_timer, 0);
+
+        // TODO: check light sensor GPIO value
+        turn_on_leds();
+    }
+}
+
+
+void app_main(void)
+{
+    ESP_LOGI(TAG, "Nightlight initializing...");
+
+    // Initialize LED strip
+    led_strip_config_t strip_config = {
+        .strip_gpio_num = LED_STRIP_PIN,
+        .max_leds = NUM_LEDS,
+        .flags.invert_out = false,
+    };
+
+    led_strip_rmt_config_t rmt_config = {
+        .clk_src = RMT_CLK_SRC_DEFAULT,
+        .resolution_hz = 10 * 1000 * 1000, // 10MHz
+        .mem_block_symbols = 64,
+        .flags.with_dma = false,
+    };
+
+    ESP_ERROR_CHECK(led_strip_new_rmt_device(&strip_config, &rmt_config, &strip));
+    ESP_ERROR_CHECK(led_strip_clear(strip));
+    ESP_LOGI(TAG, "LED strip initialized");
+
+    // Configure PIR sensor GPIO
+    gpio_config_t pir_conf = {
+        .intr_type = GPIO_INTR_POSEDGE,
+        .mode = GPIO_MODE_INPUT,
+        .pull_down_en = GPIO_PULLDOWN_ENABLE,
+        .pull_up_en = GPIO_PULLUP_DISABLE,
+        .pin_bit_mask = (1ULL << PIR_PIN)
+    };
+    ESP_ERROR_CHECK(gpio_config(&pir_conf));
+    ESP_LOGI(TAG, "GPIO config for PIR sensor initialized");
+
+    // Configure light sensor GPIO
+    gpio_config_t light_conf = {
+        .mode = GPIO_MODE_INPUT,
+        .pull_up_en = GPIO_PULLUP_DISABLE,
+        .pull_down_en = GPIO_PULLDOWN_DISABLE,
+        .pin_bit_mask = (1ULL << LIGHT_SENSOR_PIN)
+    };
+
+    ESP_ERROR_CHECK(gpio_config(&light_conf));
+    ESP_LOGI(TAG, "GPIO config for light sensor initialized");
+
+    ESP_ERROR_CHECK(gpio_install_isr_service(0));
+    ESP_ERROR_CHECK(gpio_isr_handler_add(PIR_PIN, pir_isr_handler, NULL));
+
+    // Timer setup
+    off_timer = xTimerCreate("off_timer", pdMS_TO_TICKS(TIMEOUT_MS), pdFALSE, NULL, off_timer_callback);
+
+    // LED task setup
+    xTaskCreate(led_task, "led_task", 2048, NULL, 10, &led_task_handle);
+
+    ESP_LOGI(TAG, "System initialized.");
+    vTaskSuspend(NULL);  // Suspend main task
+}