HX711模塊是內(nèi)置信號放大的24位有符號差分模/數(shù)(A/D)轉(zhuǎn)換模塊。它內(nèi)置了最大128倍增益，能夠把微小的信號(幾mV)進(jìn)行量化。HX711有2路通道(A通道與B通道)，通信過程簡單，但是采樣率比較低(10Hz/80Hz)，廣泛應(yīng)用于電子秤等使用應(yīng)變片進(jìn)行壓力或拉力測量場所。

HX711的輸入電路以橋式電路為主，經(jīng)典芯片外圍電路如下圖所示：

HX711模塊給的實(shí)例程序大部分是51單片機(jī)的程序，博主對此進(jìn)行了翻譯，寫出了HX711的Arduino驅(qū)動程序，以下為程序內(nèi)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;

}