Similarly to pull-up resistors, pull-down resistors ensure the voltage between VCC and a microcontroller pin is actively controlled when the switch is open. However, instead of pulling a pin to a high value, such resistors pull the pin to a low valued instead. Though being less commonly used...
INPUT_PULLUP);pinMode(down, INPUT_PULLUP);pinMode(del, INPUT_PULLUP);pinMode(match, INPUT_PULLUP);pinMode(buzzer, OUTPUT);pinMode(indFinger, OUTPUT);digitalWrite(buzzer, LOW);if(digitalRead(enroll) ==0)
INPUT_PULLUP = 0x2, INPUT_PULLDOWN = 0x3, } PinMode; //RPI Pico的引脚模式定义 /* Define mock symbols to nullify PinMode definitions */ #define PullNone TempPullNone #define PullUp TempPullUp #define PullDown TempPullDown #define OpenDrainPullUp TempOpenDrainPullUp #define OpenDrainNoPu...
{ delay(1000);pinMode(enroll, INPUT_PULLUP);pinMode(up, INPUT_PULLUP);pinMode(down, INPUT_PULLUP);pinMode(del, INPUT_PULLUP);pinMode(match, INPUT_PULLUP);pinMode(sw1, INPUT_PULLUP);pinMode(sw2, INPUT_PULLUP);pinMode(sw3, INPUT_PULLUP);pinMode(resultsw, INPUT_PULLUP);pinMode(...
pinMode(26, INPUT|PULLUP ); // 检测到引脚 26 下降沿,触发中断函数 blink attachInterrupt(26, blink, FALLING); Serial.println("\nstart irq test"); } void loop() { } // 中断函数 void blink() { Serial.println("IRQ"); } 二、IIC 使用简析 ...
pinMode(26, INPUT|PULLUP ); // 检测到引脚 26 下降沿,触发中断函数 blink attachInterrupt(26, blink, FALLING); Serial.println("\nstart irq test"); } void loop() { } // 中断函数 void blink() { Serial.println("IRQ"); } 1.
引脚资源还是挺丰富的,性能也很可以:ESP32-WROOM-32D(或32U)模组内置ESP32-D0WD双核芯 片,40MHz晶振,32Mbit 3.3V flash 和板载天线。 Arduino IDE下载的第三方库在portable/sketchbook/libraries里 学习过程中主要参考了b站和csdn的两位大佬的教程!感谢!
要注意的还有一点是:I used the Arduino’s pullup resistors to “steer” the inputs high when they were not engaged by the encoder. Hence the encoder common pin is connected to ground. (译者作者使用Arduino内部上拉电阻使输入端的常态是高电平,因此编码器的公共端是连接到地上)上面的程序没有提到...
println(maxy); } void setup() { pinMode(BUTTON_TEST,INPUT_PULLUP); pinMode(LED_BUILTIN,OUTPUT); digitalWrite(LED_BUILTIN,LOW); Serial.begin(115200); Serial.println("EEPROM variable read and write."); // Read EEPROM int EEAddr = EEADDR; EEPROM.get(EEAddr,minx); EEAddr +=sizeof(...
pinMode(readPin, INPUT); pinMode(buttonPin, INPUT_PULLUP); pinMode(triggerPin, OUTPUT); digitalWrite(triggerPin, LOW); Serial.begin(9600); delay(3000); Serial.println(“Sensor is ready, waiting for button press!”); } After this, I defined two functions, the read_sensor and...