功能

声音越大，亮的灯越多。
oled显示出当前的声音大小。

硬件接线

//OLED----MSP430
//VCC-----3.3V
//GND-----GND
//D0------P3.2
//D1------P3.0
//RES-----P2.0
//DC------P2.2
//CS------P8.1

led
P4八个引脚

adc
P6.0

部分代码

    _EINT();
    while (1)
    {
        adok_ifg = 1; /* 转换结束后变成0 */
        ADC12CTL0 |= ADC12SC;                   // Sampling open
        delay_ms(500);
        while (adok_ifg == 1)
            ; /* 等待装换结束 */

        fute = adcvalue * 0.00805;
        xianshi[0] = fute % 100 / 10 + '0';
        xianshi[1] = '.';
        xianshi[2] = fute % 10 + '0';
        xianshi[3] = 'V';
        xianshi[4] = 0;
        OLED_ShowString(0, 0, xianshi);

        xianshi[0] = adcvalue % 10000 / 1000 + '0';
        xianshi[1] = adcvalue % 1000 / 100 + '0';
        xianshi[2] = adcvalue % 100 / 10 + '0';
        xianshi[3] = adcvalue % 10 + '0';
        xianshi[4] = 'X';
        xianshi[5] = 0;
        OLED_ShowString(0, 2, xianshi);

        if (adcvalue <= min_YIN)
            adcvalue = min_YIN;
        if (adcvalue > max_YIN)
            adcvalue = max_YIN;

        adcvalue = adcvalue - min_YIN;

        temp1 = max_YIN - min_YIN;
        duan = temp1 / 8;
        if (adcvalue > duan * 7)
        {
            P4OUT = 0X00;
        }
        else if (adcvalue > duan * 6)
        {
            P4OUT = BIT7;
        }
        else if (adcvalue > duan * 5)
        {
            P4OUT = BIT7 + BIT6;
        }
        else if (adcvalue > duan * 4)
        {
            P4OUT = BIT7 + BIT6 + BIT5;
        }
        else if (adcvalue > duan * 3)
        {
            P4OUT = BIT7 + BIT6 + BIT5 + BIT4;
        }
        else if (adcvalue > duan * 2)
        {
            P4OUT = BIT7 + BIT6 + BIT5 + BIT4 + BIT3;
        }
        else if (adcvalue > duan * 1)
        {
            P4OUT = BIT7 + BIT6 + BIT5 + BIT4 + BIT3 + BIT2;
        }
        else if (adcvalue > 50)
        {
            P4OUT = BIT7 + BIT6 + BIT5 + BIT4 + BIT3 + BIT2 + BIT1;
        }
        else
        {
            P4OUT = 0XFF;
        }

        temp1 = max_YIN - min_YIN;
        temp2 = (float) adcvalue / (float) temp1 * 300;
        temp3 = temp2;

        temp1 = 210 + temp3;
        CCR1 = temp1; //设置为210到510

        xianshi[0] = 'P';
        xianshi[1] = 'W';
        xianshi[2] = 'M';
        xianshi[3] = temp1 % 10000 / 1000 + '0';
        xianshi[4] = temp1 % 1000 / 100 + '0';
        xianshi[5] = temp1 % 100 / 10 + '0';
        xianshi[6] = temp1 % 10 + '0';
        xianshi[7] = 0;
        OLED_ShowString(0, 4, xianshi);

    }
}

// ADC12 interrupt service routine
#pragma vector=ADC12_VECTOR
__interrupt void ADC12_ISR(void)
{
    adcvalue = ADC12MEM0;

    adok_ifg = 0;

}

全部代码

https://docs.qq.com/sheet/DUEdqZ2lmbmR6UVdU?u=bdf8eeb84961492ba2b62f7bfee641ea&tab=BB08J2