所以我试图在我当前的 Arduino 项目中计算瑞士流量 SF800 流量传感器/仪表的脉冲，但我目前没有将任何数据打印到控制台。我的 Arduino 草图如下所示，
// global variables should be identified with _
// flow_A LED
int led = 4;
// relay_A
const int RELAY_A = A0;
// variables from sketch example
String inputString = ""; // a string to hold incoming data
boolean stringComplete = false; // whether the string is complete
// FLOWMETER SHIT
// flowmeter 0 pulse (input) = digital pin 2
// https://github.com/Kegbot/kegboard/blob/master/arduino/kegboard/kegboard_config.h
// which pin to use for reading the sensor? kegboard-mini shield has digital pin 2 allocated
# define FLOWSENSORPIN 2
int rpmcount = 0;
int rpm = 0;
unsigned long lastmillis = 0;
void setup() {
// initialize serial
Serial.begin(9600); // open serial port, sets data rate to 115200bps
inputString.reserve(200);
pinMode(RELAY_A, OUTPUT);
// flowmeter shit
pinMode(FLOWSENSORPIN, INPUT);
digitalWrite(FLOWSENSORPIN, HIGH); // Need to set these HIGH so they won't just tick away
attachInterrupt(0, rpm_fan, FALLING); // interrupt is attached, is on pin two(2).
}
void open_valve() {
digitalWrite(RELAY_A, HIGH); // turn RELAY_A on
// Serial.println("Valve Open");
Serial.write("{valve_open}");
}
void close_valve() {
digitalWrite(RELAY_A, LOW); // turn RELAY_A off
// Serial.println("Vavle Closed");
Serial.write("{valve_close}");
}
void flow_A_blink() {
digitalWrite(led, HIGH); // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for one second
digitalWrite(led, LOW); // turn the LED off by making the voltage LOW
delay(1000); // wait for a second
}
void flow_A_blink_stop() {
digitalWrite(led, LOW);
}
// flowmeter shit
void getFlow() {
Serial.println("reached getFlow function");
if(millis() - lastmillis == 1000) { // Update every one second, this will be equal to reading frequency (Hz).
detachInterrupt(0); // Disable interrupt when calculating
rpm = rpmcount * 60; // Convert frequency to RPM, note: this works for one interruption per full rotation.
Serial.print("RPM =\t"); // print the word "RPM and tabl.
Serial.print(rpm); // print the rpm value
Serial.print("\t Hz=\t"); // print the word "Hz".
Serial.println(rpmcount); // print revolutions per second or Hz. And print new line or enter.
rpmcount = 0; // Restart the RPM counter
lastmillis = millis(); // Update lastmillis
attachInterrupt(0, rpm_fan, FALLING); // enable interrupt
}
}
void rpm_fan() { // this code will be executed every time the interrupt 0 (pin2) gets low.
rpmcount++;
}
/*
* Main program loop, runs over and over repeatedly
*/
void loop() {
if(stringComplete) {
// Serial.println(inputString);
if(inputString.equals("{open_valve}\n")) {
// Serial.println("opening valve.");
open_valve();
getFlow();
}
if(inputString.equals("{close_valve}\n")) {
// Serial.println("close vavle.");
close_valve();
}
// clear the string:
inputString = "";
stringComplete = false;
}
}
/*
SerialEvent occurs whenever a new data comes in the
hardware serial RX. This routine is run between each
time loop() runs, so using delay inside loop can delay
response. Multiple bytes of data may be available.
*/
void serialEvent() {
while(Serial.available()) {
// get the new byte:
char inChar = (char)Serial.read();
// add it to the inputString:
inputString += inChar;
// if the incoming character is a newline, set a flag
// so the main loop can do something about it:
if (inChar == '\n') {
stringComplete = true;
}
// Serial.println(inputString.length());
}
}