4x4矩阵键盘长按按键控制反应，失败
用arduino连接4x4矩阵键盘，LED灯。写了代码，目的是：长按A键3秒后LED灯闪一下。代码上传成功，但是目前的成功率很迷，有的时候按三秒就正常反应，有的时候不管我按下多少秒灯都不做理会。所以我的代码肯定存在缺陷。希望有人帮忙指点一下，不胜感激！代码如下：
#include <Keypad.h>
int LED = 13;
const byte ROWS = 4;
const byte COLS = 4;
char hexaKeys = {
{'1', '2', '3', 'A'},
{'4', '5', '6', 'B'},
{'7', '8', '9', 'C'},
{'*', '0', '#', 'D'}
};
byte rowPins = {4, 5, 6, 7}; //connect to the row pinouts of the keypad
byte colPins = {8, 9, 10, 11}; //connect to the column pinouts of the keypad
//initialize an instance of class NewKeypad
Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);
void setup() {
Serial.begin(9600);
pinMode(LED, OUTPUT);
}
void loop() {
char customKey = customKeypad.getKey();
if (timer()) {
digitalWrite(LED, HIGH);
delay(2000);
digitalWrite(LED, LOW);
}
}
bool timer() { //timer这个函数是我自定义的，前面大部分是示例，错误就在这部分
char customKey = customKeypad.getKey();
int setTime = 3000; //设定所需连续按键时间
int flag = 0;
if (customKey == 'A') {
flag = 1;
long orgTime = millis();//感觉这句不太对，我想用orgTime标记按下A键的初时刻，但是由于A一直按着，orgTime可能会往后变化？？
while (millis() - orgTime <= setTime) {
if (customKey != 'A')flag = 0;
}
}
if (flag == 1)return true;
else return false;
}
页:
[1]