#define LED_PIN 7
void setup() { Serial.begin(115200); pinMode(LED_PIN, OUTPUT); Serial.println("开始测试 GPIO3"); }
void loop() { digitalWrite(LED_PIN, HIGH); Serial.println("LED 设置为 HIGH"); delay(3000);
digitalWrite(LED_PIN, LOW); Serial.println("LED 设置为 LOW"); delay(3000); }
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