求arduino外接CD74HC4067扩展模仿输入的问题。
测试环境：代码运行效果：
代码如下：
// 74HC4067 multiplexer demonstration (16 to 1)
// control pins output table in array form
// see truth table on page 2 of TI 74HC4067 data sheet
// connect 74HC4067 S0~S3 to Arduino D7~D4 respectively
// connect 74HC4067 pin 1 to Arduino A0
byte controlPins[] = {B00000000,
B10000000,
B01000000,
B11000000,
B00100000,
B10100000,
B01100000,
B11100000,
B00010000,
B10010000,
B01010000,
B11010000,
B00110000,
B10110000,
B01110000,
B11110000 };
// holds incoming values from 74HC4067
byte muxValues[] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,};
void setup()
{
Serial.begin(9600);
DDRD = B11111111; // set PORTD (digital 7~0) to outputs
}
void setPin(int outputPin)
// function to select pin on 74HC4067
{
PORTD = controlPins;
}
void displayData()
// dumps captured data from array to serial monitor
{
Serial.println();
Serial.println("Values from multiplexer:");
Serial.println("========================");
for (int i = 0; i < 16; i++)
{
Serial.print("input I");
Serial.print(i);
Serial.print(" = ");
Serial.println(muxValues);
}
Serial.println("========================");
}
void loop()
{
for (int i = 0; i < 16; i++)
{
setPin(i); // choose an input pin on the 74HC4067
muxValues=analogRead(0); // read the vlaue on that pin and store in array
}
// display captured data
displayData();
delay(2000);
}
我想实现按一个出来个，不按不输出该怎么写呢
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