本帖最后由 swhl 于 2020-5-20 21:47 编辑
CD74HC4067 作用是选通一路对十六路模拟信号,就像一个单刀多掷开关,根据芯片上 S0-S3 四个不同管脚的组合,让SIG管脚和C0-C15导通(每次只能连接一个),它适用于数字和模拟信号,可以只用5针最多连接16传感器系统,也可以用它来管理多个设备。
//测量换算每个Pin的电压
这个芯片的使用方法非常简单,例如: S0-S3 分别是 0 0 0 0时,SIG就和 C0是导通的。因此,这里我做一个实验,将一些电阻串联起来,分别接在C1 C3 C5 C9 C11 上面,然后测量换算每个Pin的电压.
[kenrobot_code]//Mux control pins
int s0 = 7;
int s1 = 6;
int s2 = 5;
int s3 = 4;
//Mux in "SIG" pin
int SIG_pin = 0;
void setup()
{
pinMode(s0, OUTPUT);
pinMode(s1, OUTPUT);
pinMode(s2, OUTPUT);
pinMode(s3, OUTPUT);
digitalWrite(s0, LOW);
digitalWrite(s1, LOW);
digitalWrite(s2, LOW);
digitalWrite(s3, LOW);
Serial.begin(9600);
}
void loop()
{
int v;
//Loop through and read all 16 values
//Reports back Value at channel 6 is: 346
for(int i = 0; i < 16; i ++)
{
Serial.print("Value at channel ");
Serial.print(i);
Serial.print(" is : ");
v = readMux(i);
Serial.println(v * 5.0 / 1024);
}
Serial.println(" ");
delay(3000);
}
int readMux(int channel)
{
int controlPin[] = {s0, s1, s2, s3};
int muxChannel[16][4] =
{
{0, 0, 0, 0}, //channel 0
{1, 0, 0, 0}, //channel 1
{0, 1, 0, 0}, //channel 2
{1, 1, 0, 0}, //channel 3
{0, 0, 1, 0}, //channel 4
{1, 0, 1, 0}, //channel 5
{0, 1, 1, 0}, //channel 6
{1, 1, 1, 0}, //channel 7
{0, 0, 0, 1}, //channel 8
{1, 0, 0, 1}, //channel 9
{0, 1, 0, 1}, //channel 10
{1, 1, 0, 1}, //channel 11
{0, 0, 1, 1}, //channel 12
{1, 0, 1, 1}, //channel 13
{0, 1, 1, 1}, //channel 14
{1, 1, 1, 1} //channel 15
};
//loop through the 4 sig
for(int i = 0; i < 4; i ++)
{
digitalWrite(controlPin, muxChannel[channel]);
}
//read the value at the SIG pin
int val = analogRead(SIG_pin);
//return the value
return val;
}
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