2、数字输入上拉 DigitalInputPullup - 输出上拉串口 InputPullupSerial This example demonstrates the use of INPUT_PULLUP with pinMode(). It monitors the state of a switch by establishingserial communicationbetween your Arduino and your computer over USB. 本例演示如何使用 pinMode 和 INPUT_PULLUP。
State change detection (edge detection) Often, you don't need to know the state of a digital input all the time, but you just need to know when the input changes from one state to another. For example, you want to know when a button goes from OFF to ON. This is called state chang...
/* Blink Switching a LED on and off This example is part of the Fritzing Creator Kit: www.fritzing.org/creator-kit. */ int led = 13; // integer variable led is declared void setup() { // the setup() method is executed only once pinMode(led, OUTPUT); // the led PIN is declare...
Demonstrates analog input by reading an analog sensor on analog pin 0 and turning on and off a light emitting diode(LED) connected to digital pin 13. The amount of time the LED will be on and off depends on the value obtained by analogRead().演示模拟输入，通过读取连接到模拟针...
the other side pin to +5V - LED anode (long leg) attached to digital output 13 cathode (short leg) attached to ground - Note: because most Arduinos have a built-in LED attached to pin 13 on the board, the LED is optional.
or ATmega328), this function works on pins 3, 5, 6, 9, 10, and 11. On the Arduino Mega, it works on pins 2 through 13. Older Arduino boards with an ATmega8 only support analogWrite() on pins 9, 10, and 11. You do not need to call pinMode() to set the pin as an output ...
* LED connected from digital pin 9 to ground created 29 Dec. 2008 modified 9 Apr 2012 by Tom Igoe This example code is in the public domain. */ // These constants won't change. They're used to give names // to the pins used: ...
It is rather well known that the functions for digital I/O in Arduino are quite slow. It takes about 4 microseconds to change the logical level of an output pin (for example, to turn on an LED) using the ArduinodigitalWritefunction, while it takes less than 0.1 microse...
// This line sets the RTC with an explicit date & time, for example to set // January 21, 2014 at 3am you would call: // rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0)); } lcd.setCursor(0,0); lcd.print("Press Match to "); ...
Serial.println("Example: Font_simple"); Serial.print("found ID = 0x"); Serial.println(ID, HEX); Serial.println("The display font is ready OK!"); if (ID == 0xD3D3) ID = 0x9481; //如果只写显示,则强制 ID tft.begin(ID); ...