这样接线：

和单片机接线

hx711

oled

串口线

/* 3.3V供电 2.2接SCK 2.3接DT */

/*

•     /|\|              XIN|-
  

•      | |                 | 32kHz
  

•      --|RST          XOUT|-
  

•        |                 |
  

•        |     P1.2/UCA0TXD|------------>
  

•        |                 | 9600 - 8N1
  

•        |     P1.1/UCA0RXD|<------------
  

*/

// ------------------------------------------------------------

// IO口模拟I2C通信

// SCL接P2^0

// SDA接P2^1

部分代码

cpp
char dis_str[15];
uchar count = 0;
uchar korkg = 0;
uchar bluetoo = 0;
uchar item = 0;
int zhouqi  = 1000;
int zhouqi1  = 0;
int zhouqi_count = 0;
uchar count_time = 0;
uchar ifg_time0 = 0;
int main( void )
{
 WDTCTL = WDTPW + WDTHOLD;       /* Stop WDT */
 if ( CALBC1_8MHZ == 0xFF )      /* If calibration constant erased */
 {
  while ( 1 )
   ;               /* do not load, trap CPU!! */
 }
 DCOCTL = 0;                    /* Select lowest DCOx and MODx settings */
 BCSCTL1 = CALBC1_8MHZ;          /* Set range */
 DCOCTL = CALDCO_8MHZ;          /* Set DCO step + modulation * / */
 uart_init();
 PutString( "bluetooth init" );
 P1DIR |= BIT3;
 P1OUT |= BIT3;
 OLED_Init();    /* OLED初始化 */
 /* OLED_ShowString(0, 0, "system"); */
 hx711_port_init();
 Get_Maopi();    /* 重新获取毛皮重量 */
 delay_ms( 1000 );
 Get_Maopi();    /* 重新获取毛皮重量 */
 P1DIR &= ~(BIT4 + BIT5 + BIT6);
 P1REN |= (BIT4 + BIT5 + BIT6);
 P1OUT |= (BIT4 + BIT5 + BIT6);
 if ( bluetoo == 1 )
  OLED_ShowString( 0, 4, "ON " );
 else
  OLED_ShowString( 0, 4, "OFF" );
 memset( dis_str, 0, 15 );
 sprintf( dis_str, "  %d  ", zhouqi );
 OLED_ShowString( 30, 4, dis_str );
 CCTL0 = CCIE;                         /* CCR0 interrupt enabled */
 CCR0 = 32 * 50;
 TACTL = TASSEL_1 + MC_1;              /* SMCLK, upmode */
 _EINT();
 while ( 1 )
 {
  /* 重量检测 */
  if ( ++count_time == 4 )
  {
   count_time = 0;
   Get_Weight();
   if ( Flag_Error == 0 )
   {
    /* printf( "净重量 = %d g\r\n",  Weight_Shiwu);       / * 打印 * / */
    if ( korkg == 0 )
    {
     count   = 0;
     dis_str[count++] = Weight_Shiwu % 1000000 / 100000 + '0';
     dis_str[count++] = Weight_Shiwu % 100000 / 10000 + '0';
     dis_str[count++] = Weight_Shiwu % 10000 / 1000 + '0';
     dis_str[count++] = Weight_Shiwu % 1000 / 100 + '0';
     /*
      * dis_str[count++] = '.';
      * dis_str[count++] = Weight_Shiwu % 100 / 10 + '0';
      * dis_str[count++] = Weight_Shiwu % 10 + '0';
      */
     dis_str[count++] = ' ';
     dis_str[count++] = 'g';
     dis_str[count++] = ' ';
     dis_str[count++] = ' ';
     dis_str[count++] = 0;
    } else {
     count   = 0;
     dis_str[count++] = Weight_Shiwu % 1000000 / 100000 + '0';
     dis_str[count++] = '.';
     dis_str[count++] = Weight_Shiwu % 100000 / 10000 + '0';
     dis_str[count++] = Weight_Shiwu % 10000 / 1000 + '0';
     dis_str[count++] = Weight_Shiwu % 1000 / 100 + '0';
     /*
      * dis_str[count++] = Weight_Shiwu % 100 / 10 + '0';
      * dis_str[count++] = Weight_Shiwu % 10 + '0';
      */
     dis_str[count++] = ' ';
     dis_str[count++] = 'k';
     dis_str[count++] = 'g';
     dis_str[count++] = ' ';
     dis_str[count++] = ' ';
     dis_str[count++] = 0;
    }
    OLED_ShowString( 0, 2, dis_str );
   } else {
    OLED_ShowString( 0, 2, "OVERWEI" );
   }
  }
  /* 打开蓝牙了就发送 否则不发送 */
  if ( bluetoo == 1 )
  {
   zhouqi1 = zhouqi / 50;
   zhouqi_count++;
   if ( zhouqi_count == zhouqi1 ) /* 到了蓝牙发送周期 */
   {
    zhouqi_count = 0;
    PutString( dis_str );
    PutString( " \r\n" );
   }
  }
  /* 超重检测 */
  if ( Weight_Shiwu > 50000 )
  {
   P1OUT &= ~BIT3;
  } else {
   P1OUT |= BIT3;
  }
  /*按键1 k/kg */
  if ( (P1IN & BIT4) == 0 )
  {
   delay_ms( 10 );
   if ( (P1IN & BIT4) == 0 )
   {
    while ( (P1IN & BIT4) == 0 )
     ;
    if ( item == 0 )
    {
     korkg = !korkg;         /* 切换数值 下次显示就刷新显示 */
    } else if ( item == 1 )
    {
     bluetoo = !bluetoo;     /* 打开或关闭蓝牙 */
     if ( bluetoo )
      OLED_ShowString( 0, 4, "ON " );
     else
      OLED_ShowString( 0, 4, "OFF" );
    } else if ( item == 2 )
    {
     zhouqi += 50;
     memset( dis_str, 0, 15 );
     sprintf( dis_str, "  %d  ", zhouqi );
     OLED_ShowString( 30, 4, dis_str );
    }
   }
  }
  /*按键2 去皮 */
  if ( (P1IN & BIT5) == 0 )
  {
   delay_ms( 10 );
   if ( (P1IN & BIT5) == 0 )
   {
    while ( (P1IN & BIT5) == 0 )
     ;
    if ( item == 0 )
    {
     Get_Maopi();            /* 重新获取毛皮重量 */
    } else if ( item == 1 )
    {
     bluetoo = !bluetoo;     /* 打开或关闭蓝牙 */
     if ( bluetoo )
      OLED_ShowString( 0, 4, "ON " );
     else
      OLED_ShowString( 0, 4, "OFF" );
    } else if ( item == 2 )
    {
     zhouqi -= 50;
     memset( dis_str, 0, 15 );
     sprintf( dis_str, "  %d  ", zhouqi );
     OLED_ShowString( 30, 4, dis_str );
    }
   }
  }
  /*按键3 */
  if ( (P1IN & BIT6) == 0 )
  {
   delay_ms( 10 );
   if ( (P1IN & BIT6) == 0 )
   {
    while ( (P1IN & BIT6) == 0 )
     ;
    item = (item + 1) % 3;  /* 0 1 2 */
   }
  }
  while ( ifg_time0 )
   ;                               /* 等待50ms过去 */
  ifg_time0 = 1;
 }
}
/* Timer A0 interrupt service routine */
#pragma vector=TIMER0_A0_VECTOR
__interrupt void Timer_A( void )
{
 ifg_time0 = 0; /* 50ms进入这里 */
}

完整代码

csharp
https://docs.qq.com/sheet/DUEdqZ2lmbmR6UVdU?tab=BB08J2