//引腳觸摸傳感器 控制LED亮度 2020 dusty electronix

//https://www.bilibili.com/video/BV1of4y127ow

int capval2,capval3;//設(shè)定2、3引腳電容值變量

int led9,led11;

void setup()

{

Serial.begin(9600);//與電腦串口通訊

}

void loop ()

{

capval2 = readCapacitivePin(2);? ?//讀取2引腳電容數(shù)值

capval3 = readCapacitivePin(3);? ?//讀取3引腳電容數(shù)值

Serial.print("pin2:");

? ?Serial.println(capval2);//顯示2引腳電容數(shù)值

led9 = map(capval2,2,17,0,255);//轉(zhuǎn)換2引腳電容數(shù)值為led9亮度值

analogWrite(9, led9);//寫入led9亮度

??

Serial.print("pin3:");

? ?Serial.println(capval3);//顯示3引腳電容數(shù)值

led11 = map(capval3,2,17,0,255);//轉(zhuǎn)換3引腳電容數(shù)值為led11亮度值

analogWrite(11, led11);//寫入led11亮度

delay(100);//悠著點(diǎn)

}

//原始代碼

uint8_t readCapacitivePin(int pinToMeasure) {

// Variables used to translate from Arduino to AVR pin naming

volatile uint8_t* port;

volatile uint8_t* ddr;

volatile uint8_t* pin;

// Here we translate the input pin number from

// Arduino pin number to the AVR PORT, PIN, DDR,

// and which bit of those registers we care about.

byte bitmask;

port = portOutputRegister(digitalPinToPort(pinToMeasure));

ddr = portModeRegister(digitalPinToPort(pinToMeasure));

bitmask = digitalPinToBitMask(pinToMeasure);

pin = portInputRegister(digitalPinToPort(pinToMeasure));

// Discharge the pin first by setting it low and output

*port &= ~(bitmask);

*ddr |= bitmask;

delay(1);

// Make the pin an input with the internal pull-up on

*ddr &= ~(bitmask);

*port |= bitmask;

// Now see how long the pin to get pulled up. This manual unrolling of the loop

// decreases the number of hardware cycles between each read of the pin,

// thus increasing sensitivity.

uint8_t cycles = 17;

if (*pin & bitmask)

cycles = 0;

else if (*pin & bitmask)

cycles = 1;

else if (*pin & bitmask)

cycles = 2;

else if (*pin & bitmask)

cycles = 3;

else if (*pin & bitmask)

cycles = 4;

else if (*pin & bitmask)

cycles = 5;

else if (*pin & bitmask)

cycles = 6;

else if (*pin & bitmask)

cycles = 7;

else if (*pin & bitmask)

cycles = 8;

else if (*pin & bitmask)

cycles = 9;

else if (*pin & bitmask)

cycles = 10;

else if (*pin & bitmask)

cycles = 11;

else if (*pin & bitmask)

cycles = 12;

else if (*pin & bitmask)

cycles = 13;

else if (*pin & bitmask)

cycles = 14;

else if (*pin & bitmask)

cycles = 15;

else if (*pin & bitmask)

cycles = 16;

// Discharge the pin again by setting it low and output

// It's important to leave the pins low if you want to

// be able to touch more than 1 sensor at a time - if

// the sensor is left pulled high, when you touch

// two sensors, your body will transfer the charge between

// sensors.

*port &= ~(bitmask);

*ddr |= bitmask;

return cycles;

}

//原始代碼完