lcd.print(newKey); } else { secondNum = secondNum + newKey; lcd.print(newKey); } 如果按下的键不是数字,请检查是否为‘+’,‘ - ’,‘/’,‘*’(在thekeypad上,这些键是‘A’,‘B’,‘D’,‘*’)。如果它来自这些键,我们将存储稍后将使用的值。它还会将firstNum设置为false,这意味着我们...
// 初始化键盘对象，参数是列线、行线和表示按键是否被按下的函数。这里的“buttonPress”函数需要根据实际硬件连接情况进行编写。这个函数会接收一个按键的行列值，然后返回该键是否被按下。函数的具体实现这里没有给出。Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
1 × LCD I2C 1 × Keypad 3x4 and 4x4 Kit 1 × Alternatively, Keypad 3x4 1 × Alternatively, Keypad 4x4 1 × Breadboard 1 × Jumper Wires 1 × Recommended: Screw Terminal Block Shield for Arduino Uno 1 × Recommended: Breadboard Shield for Arduino Uno 1 × Recommended: Enclosu...
//instancia de Keypad, responsável por capturar a tecla pressionada Keypad customKeypad = Keypad( makeKeymap(SIMBOLOS), PINOS_LINHA, PINOS_COLUNA, LINHAS, COLUNAS); 步骤7:密码设置 在这一部分中,我们定义密码,然后我们需要输入一个密码,它是一个空字符串。 //variáveis resposnsáveis por armazen...
Using an LCD with the Keypad Now let’s see how to print the key presses on an LCD. 4X4 keypads use 8 pins and 3X4 keypads use 7 pins. That takes up a lot of pins, so I’m going to use an I2C enabled LCD because it only needs 4 wires to connect to the Arduino. ...
Keypad库:用于读取键盘输入 LiquidCrystal_I2C库(如果使用I2C LCD):用于控制LCD显示可以通过Arduino IDE的“库管理器”搜索并安装这些库。 4. 编写Arduino代码 以下是实现计算器基本运算功能的Arduino代码示例: cpp #include <Keypad.h> #include <Wire.h> #include <LiquidCrystal_I2C.h> /...
1 × Alternatively, Keypad 3x4 1 × Alternatively, Keypad 4x4 1 × Relay 1 × 12V Power Adapter 1 × DC Power Jack 1 × Electromagnetic Lock 1 × Jumper Wires 1 × Optionally, LCD I2C 1 × Recommended: Screw Terminal Block Shield for Arduino Uno 1 × Recommended: Breadboard...
PCA9555 32-Bit GPIO Expander with Arduino and a 4X4 Keypad PCA9555 32-Bit GPIO Expander with Arduino Using Interrupts PCA9555 32-Bit GPIO Expander with Arduino and LCD Display YouTube Video for Series Connect-Program Arduino and a MM5451 LED Display Driver Arduino and a MM5451 LED Display ...
Nokia 5110 LCD 红屏 液晶屏模块 红色PCB 广州翰禹电子商务有限公司4年 月均发货速度:暂无记录 广东 深圳市福田区 ¥7.98 LCD1602字符液晶屏 输入输出扩展板 Keypad Shield 适用于Arduino 深圳市宝安区橙光电子商行1年 月均发货速度:暂无记录 广东 深圳市 ...
9. LEGO 4x4 Keypad Matrix If you’ve ever wanted to own a custom keypad for various applications, the LEGO keypad matrix in thisInstructables projectmight get the job done. It can script shortcuts for your computer and makes navigating from one program to another a seamless affair. This buil...