还要检查是否已安装LiquidCrystal库。如果没有,您可以使用相同的方法找到它。 安装库并重新启动IDE。 现在复制下面的代码并将其粘贴到IDE中。将其上传到arduino。 (可以从下面下载4x3的代码):- 此代码将帮助您检查键盘的工作情况,它显示在串行监视器上按下的按钮。 /*Code for 4x4 keypad*/ #include const byte ...
Example #include <Keypad.h> const byte ROWS = 4; //four rows const byte COLS = 3; //three columns char keys[ROWS][COLS] = { {‘1’,‘2’,‘3’}, {‘4’,‘5’,‘6’}, {‘7’,‘8’,‘9’}, {’#’,‘0’,’*’} }; byte rowPins[ROWS] = {5, 4, 3, 2}; //c...
//#include <Keypad.h> #include <LiquidCrystal.h> #include <Servo.h> Servo myservo;LiquidCrystal...
/* the tutorial code for 3x4 Matrix Keypad with Arduino is as This code prints the key pressed...
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lcd.print("VALID NFC CODE"); delay(1000); return; } else{ lcd.clear(); lcd.setCursor(0,0); lcd.print("INVALID NFC CODE"); delay(1000); lcd.setCursor(0,0); lcd.clear(); lcd.print("BLOCKED"); return; } } char c=myKeypad.getKey(); ...
但跳出循环还是与大多数语言一样，可以使用关键字continue跳出本次循环或者break跳出整个for循环。
// Create the Keypad Keypad kpd = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS ); #define ledpin 13 void setup() { pinMode(ledpin,OUTPUT); digitalWrite(ledpin, HIGH); Serial.begin(9600); } void loop() { char key = kpd.getKey(); ...
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, rows, cols); #define sensorz A3 // pin for PIR sensor data //#define contact 0 // pin for on/off alarm #define alrm 12 // pin for siren, buzzer #define redLed A2 // pin for red led ...
Sample Code /*** Description: Reads an analog input on pin 1, prints the result to the LCD. This program takes the temperture sensor LM35for example. Connection: Plug the LCD Keypad to the UNO(orother controllers) Temperture sensor: S(blue) -- A1() Note: A0 has been occupied. VCC...