new file: .vscode/arduino.json

new file:   ESP32_DAC.ino

.vscode/arduino.json

@@ -0,0 +1,6 @@
+{
+    "port": "COM4",
+    "configuration": "PSRAM=disabled,PartitionScheme=default,CPUFreq=240,FlashMode=qio,FlashFreq=80,FlashSize=4M,UploadSpeed=921600,LoopCore=1,EventsCore=1,DebugLevel=none",
+    "board": "esp32:esp32:esp32",
+    "sketch": "ESP32_DAC.ino"
+}

ESP32_DAC.ino

@@ -0,0 +1,35 @@
+#include <Arduino.h>
+#include <esp32-hal-dac.h>//DAC功能引用该库，可以不进行#include<>引用
+//查看源码后得到，DAC引脚只能是这两个引脚
+#define LED1 25
+#define LED2 26
+ 
+void setup(){
+  //长时候发现，DAC的IO口也可以不进行初始化
+  pinMode(LED1,OUTPUT);
+  pinMode(LED2,OUTPUT);
+  Serial.begin(115200);
+}
+ 
+void loop()
+{
+  // 逐渐变亮
+  for (int dutyCycle = 199; dutyCycle <= 255; dutyCycle = dutyCycle + 1)
+  {
+    dacWrite(LED1, dutyCycle);  // 输出DAC
+    dacWrite(LED2, 255 - dutyCycle);  // 输出DAC
+    Serial.printf("++++%d\n",dutyCycle);
+    delay(20);
+  }
+ 
+  // 逐渐变暗
+  for (int dutyCycle = 255; dutyCycle >= 199; dutyCycle = dutyCycle - 1)
+  {
+    dacWrite(LED1, dutyCycle);  // 输出DAC
+    dacWrite(LED2, 255 - dutyCycle);  // 输出DAC
+    Serial.printf("----%d\n",dutyCycle);
+    delay(20);
+  }
+}
+ 
+