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我正在使用以下代碼讀取傳感器中的流量。當我將傳感器插入端口2時，一切正常。但是當我把它改爲第7位時（硬件和軟件），它沒有給我任何結果，但仍然繼續測量第2位。有人知道爲什麼嗎？ 這裏是Arduino的UNO代碼帶有arduino的流量傳感器
#include <SD.h>
volatile int Signal_1; //measuring the rising edges of the signal
int MeasuredFlow_1; // the converted output signal
int flowmeter_1 = 7; // Assigning pin 7 to input of flow meter 1 (input)
void rpm() //This is the function that the interupt calls
{
Signal_1++; //This function measures the rising and falling edge of the hall effect sensors signal
}
// The setup() method runs once, when the sketch starts
void setup() //
{
pinMode(flowmeter_1, INPUT); //initializes digital pin 7 as an input
Serial.begin(9600); //This is the setup function where the serial port is initialised,
attachInterrupt(0, rpm, RISING); //attaching the interrupt
}
// the loop() method runs over and over again,
// as long as the Arduino has power
void loop()
{
Signal_1 = 0; //Set NbTops to 0 ready for calculations
sei(); //Enables interrupts
delay (1000); //Wait 1 second
cli(); //Disable interrupts
MeasuredFlow_1 = (Signal_1 * 60/7.5); //(Pulse frequency x 60)/7.5Q, = flow rate in L/hour
Serial.print (MeasuredFlow_1, DEC); //Prints the number calculated above
Serial.print (" L/hour\r\n"); //Prints "L/hour" and returns a new line
}