Arduino 畫麵包板電路圖軟體 Fritzing
常在網路上看到畫的美美的 Arduino 電路圖是使用此 Fritzing 軟體繪製的。
// readCapacitivePin
// Input: Arduino pin number
// Output: A number, from 0 to 17 expressing
// how much capacitance is on the pin
// When you touch the pin, or whatever you have
// attached to it, the number will get higher
#include "pins_arduino.h" // Arduino pre-1.0 needs this
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);
// Prevent the timer IRQ from disturbing our measurement
noInterrupts();
// 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;}
// End of timing-critical section
interrupts();
// 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;
}
// readCapacitivePin
// Input: Arduino pin number
// Output: A number, from 0 to 17 expressing
// how much capacitance is on the pin
// When you touch the pin, or whatever you have
// attached to it, the number will get higher
uint8_t readCapacitivePin(int pinToMeasure) {
pinMode(pinToMeasure, OUTPUT);
digitalWrite(pinToMeasure, LOW);
delay(1);
// Prevent the timer IRQ from disturbing our measurement
noInterrupts();
// Make the pin an input with the internal pull-up on
pinMode(pinToMeasure, INPUT_PULLUP);
// 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 (digitalRead(pinToMeasure)) { cycles = 0;}
else if (digitalRead(pinToMeasure)) { cycles = 1;}
else if (digitalRead(pinToMeasure)) { cycles = 2;}
else if (digitalRead(pinToMeasure)) { cycles = 3;}
else if (digitalRead(pinToMeasure)) { cycles = 4;}
else if (digitalRead(pinToMeasure)) { cycles = 5;}
else if (digitalRead(pinToMeasure)) { cycles = 6;}
else if (digitalRead(pinToMeasure)) { cycles = 7;}
else if (digitalRead(pinToMeasure)) { cycles = 8;}
else if (digitalRead(pinToMeasure)) { cycles = 9;}
else if (digitalRead(pinToMeasure)) { cycles = 10;}
else if (digitalRead(pinToMeasure)) { cycles = 11;}
else if (digitalRead(pinToMeasure)) { cycles = 12;}
else if (digitalRead(pinToMeasure)) { cycles = 13;}
else if (digitalRead(pinToMeasure)) { cycles = 14;}
else if (digitalRead(pinToMeasure)) { cycles = 15;}
else if (digitalRead(pinToMeasure)) { cycles = 16;}
// End of timing-critical section
interrupts();
// 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.
digitalWrite(pinToMeasure, LOW);
pinMode(pinToMeasure, OUTPUT);
return cycles;
}
http://playground.arduino.cc/Code/CapacitiveSensor
ATmega328 (used on most recent boards)
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ATmega168 (used on most Arduino Diecimila and early Duemilanove)
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ATmega8 (used on some older board)
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LED
220 Ohms
10k ohms
2N2222
單芯線
錫條
無鉛銲錫膏
萬用電路板 (洞洞板)
易折排針母座
鱷魚夾