hx711库函数arduino

HX711模块是内置信号放大的24位有符号差分模/数(A/D)转换模块。它内置了最大128倍增益，能够把微小的信号(几mV)进行量化。HX711有2路通道(A通道与B通道)，通信过程简单，但是采样率比较低(10Hz/80Hz)，广泛应用于电子秤等使用应变片进行压力或拉力测量场所。

HX711的输入电路以桥式电路为主，经典芯片外围电路如下图所示：

HX711模块给的实例程序大部分是51单片机的程序，博主对此进行了翻译，写出了HX711的Arduino驱动程序，以下为程序内容：

uint8_t HX_SCK = D3;

uint8_t HX_DT = D4;

long count0;

void setup() {

// put your setup code here, to run once:

Serial.begin(115200);

pinMode(HX_SCK, OUTPUT);

pinMode(HX_DT, INPUT);

ReadCount();

delay(100);

count0 = 0;

for(int i=0; i<8; i++)

count0 += ReadCount();

count0 /= 8;

}

void loop() {

// put your main code here, to run repeatedly:

long count = ReadCount() - count0;

Serial.println(count);

delay(100);

}

long ReadCount()

{

digitalWrite(HX_SCK, LOW);

while(digitalRead(HX_DT));

unsigned long count = 0;

for(int i=0; i<24; i++)

{

digitalWrite(HX_SCK, HIGH);

count <<= 1;

digitalWrite(HX_SCK, LOW);

if(digitalRead(HX_DT)) count |= 1;

}

digitalWrite(HX_SCK, HIGH);

if(count & 0x00800000) count |= 0xFF000000;

digitalWrite(HX_SCK, LOW);

return (long)count;

}