ESP32 Control LED with Push button (ESP-IDF)

ESP32 Control LED with Push button (ESP-IDF)

源自於 https://esp32tutorials.com/esp32-push-button-esp-idf-digital-input/#more-168

#define LED_PIN         27

#define PUSH_BUTTON_PIN 33

 main.c

#include "driver/gpio.h"

#include "freertos/FreeRTOS.h"

#include "freertos/task.h"

#include "esp_log.h"

#define LED_PIN         27

#define PUSH_BUTTON_PIN 33

// 使用一個靜態變數來追蹤按鈕的前一個狀態

static int last_pb_state = -1; // 初始化為 -1 確保程式碼一開始就會印出狀態

void app_main(void)

{

    // 配置 GPIO

    gpio_set_direction(LED_PIN, GPIO_MODE_OUTPUT);

    gpio_set_direction(PUSH_BUTTON_PIN, GPIO_MODE_INPUT);

    // 啟動時偵測並顯示初始狀態

    int current_pb_state = gpio_get_level(PUSH_BUTTON_PIN);

    last_pb_state = current_pb_state; // 儲存初始狀態

    // 啟動時，LED 狀態應與按鈕初始狀態一致

    gpio_set_level(LED_PIN, current_pb_state);

   

    // 透過序列埠顯示初始狀態

    if (current_pb_state == 1) {

        printf("啟動時按鈕狀態: High (已按下或上拉) \n");

    } else {

        printf("啟動時按鈕狀態: Low (未按下或下拉) \n");

    }

    // 主迴圈

    while(1) {

        current_pb_state = gpio_get_level(PUSH_BUTTON_PIN);

        // 偵測按鈕狀態是否改變

        if (current_pb_state != last_pb_state) {

            // 狀態已改變，透過序列埠印出新狀態

            if (current_pb_state == 1) {

                printf("按鈕狀態改變: High\n");

            } else {

                printf("按鈕狀態改變: Low\n");

            }

            // 更新 LED 狀態

            gpio_set_level(LED_PIN, current_pb_state);

            // 更新 last_pb_state 以追蹤新的狀態

            last_pb_state = current_pb_state;

        }

        // 如果狀態未改變，則不做任何事 (LED 狀態保持不變)

        vTaskDelay(pdMS_TO_TICKS(10)); // 延遲 10ms 進行消抖和降低 CPU 負載

    }

}

diagram.json

{

  "version": 1,

  "author": "alex wu",

  "editor": "wokwi",

  "parts": [

    { "type": "wokwi-breadboard-mini", "id": "bb1", "top": -59, "left": -184.8, "attrs": {} },

    {

      "type": "board-esp32-devkit-c-v4",

      "id": "esp",

      "top": -153.6,

      "left": 33.64,

      "attrs": { "builder": "esp-idf" }

    },

    {

      "type": "wokwi-pushbutton",

      "id": "btn1",

      "top": 44.6,

      "left": -240,

      "attrs": { "color": "green", "xray": "1" }

    },

    {

      "type": "wokwi-resistor",

      "id": "r1",

      "top": 13.55,

      "left": -105.6,

      "attrs": { "value": "1000" }

    },

    {

      "type": "wokwi-resistor",

      "id": "r2",

      "top": -24.85,

      "left": -105.6,

      "attrs": { "value": "1000" }

    },

    {

      "type": "wokwi-led",

      "id": "led1",

      "top": -70.8,

      "left": -130.6,

      "attrs": { "color": "red" }

    }

  ],

  "connections": [

    [ "esp:TX", "$serialMonitor:RX", "", [] ],

    [ "esp:RX", "$serialMonitor:TX", "", [] ],

    [ "esp:27", "bb1:14t.a", "green", [ "h-47.85", "v-19.2" ] ],

    [ "esp:GND.1", "bb1:7t.e", "black", [ "h-95.85", "v0", "h-57.6" ] ],

    [ "esp:GND.1", "bb1:14b.g", "black", [ "h-19.05", "v105.6" ] ],

    [ "r1:1", "bb1:8b.f", "", [ "$bb" ] ],

    [ "r1:2", "bb1:14b.f", "", [ "$bb" ] ],

    [ "r2:1", "bb1:8t.d", "", [ "$bb" ] ],

    [ "r2:2", "bb1:14t.d", "", [ "$bb" ] ],

    [ "led1:A", "bb1:8t.c", "", [ "$bb" ] ],

    [ "led1:C", "bb1:7t.c", "", [ "$bb" ] ],

    [ "esp:33", "bb1:8b.i", "violet", [ "h-38.25", "v105.6" ] ],

    [ "esp:3V3", "bb1:1b.f", "red", [ "h-239.85", "v28.8" ] ],

    [ "btn1:1.r", "bb1:1b.j", "", [ "$bb" ] ],

    [ "bb1:8b.j", "btn1:2.r", "green", [ "v28.8" ] ]

  ],

  "dependencies": {}

}

原來程式

#include "driver/gpio.h" #include "freertos/FreeRTOS.h" #include "freertos/task.h" #define LED_PIN 27 #define PUSH_BUTTON_PIN 33 void app_main(void) { gpio_set_direction(LED_PIN, GPIO_MODE_OUTPUT); gpio_set_direction(PUSH_BUTTON_PIN, GPIO_MODE_INPUT); while(1) { if (gpio_get_level(PUSH_BUTTON_PIN) == 1) { gpio_set_level(LED_PIN, 1); } else { gpio_set_level(LED_PIN, 0); } vTaskDelay(1); } }

ESP-IDF GPIO APIs for Digital Input & Digital Output

#include "driver/gpio.h"

Set Direction of GPIO Pins

gpio_set_direction(GPIO_NUM_27, GPIO_MODE_OUTPUT);

gpio_set_direction(GPIO_NUM_33, GPIO_MODE_INPUT);

Set Output Level of Digital Pin

gpio_set_level(GPIO_NUM_27, 1);

Read Digital Input (Get Output Level of Input Pin)

int gpio_get_level(GPIO_NUM_33);