Question

该计划如下所示：



#include <SoftwareSerial.h>
SoftwareSerial gprsSerial(7, 8);

byte sensorInterrupt = 0;  // 0 = digital pin 2
byte sensorPin       = 2;

// The hall-effect flow sensor outputs approximately 4.5 pulses per second per
// litre/minute of flow.
float calibrationFactor = 4.5;

volatile byte pulseCount;

float flowRate;
unsigned int flowMilliLitres;
unsigned long totalMilliLitres;

unsigned long oldTime;

void setup()
{
  gprsSerial.begin(19200);
  Serial.begin(19200);

  pinMode(sensorPin, INPUT);
  digitalWrite(sensorPin, HIGH);

  pulseCount        = 0;
  flowRate          = 0.0;
  flowMilliLitres   = 0;
  totalMilliLitres  = 0;
  oldTime           = 0;

  // The Hall-effect sensor is connected to pin 2 which uses interrupt 0.
  // Configured to trigger on a FALLING state change (transition from HIGH
  // state to LOW state)
  attachInterrupt(sensorInterrupt, pulseCounter, FALLING);

  Serial.println("Config SIM900...");
  delay(2000);
  Serial.println("Done!...");
  gprsSerial.flush();
  Serial.flush();

  // attach or detach from GPRS service
  gprsSerial.println("AT+CGATT?");
  delay(100);
  toSerial();


  // bearer settings
  gprsSerial.println("AT+SAPBR=3,1,\"CONTYPE\",\"GPRS\"");
  delay(2000);
  toSerial();

  // bearer settings
  gprsSerial.println("AT+SAPBR=3,1,\"APN\",\"uninor\"");
  delay(3000);
  toSerial();


  // bearer settings
  gprsSerial.println("AT+SAPBR=1,1");
  delay(2000);
  toSerial();

  // bearer settings
  gprsSerial.println("AT+SAPBR=2,1");
  delay(3000);
  toSerial();


  gprsSerial.println("AT+HTTPINIT");
  delay(2000);
  toSerial();

}


void loop()
{
  if ((millis() - oldTime) > 1000)   // Only process counters once per second
  {
    // Disable the interrupt while calculating flow rate and sending the value to
    // the host
    detachInterrupt(sensorInterrupt);

    // Because this loop may not complete in exactly 1 second intervals we calculate
    // the number of milliseconds that have passed since the last execution and use
    // that to scale the output. We also apply the calibrationFactor to scale the output
    // based on the number of pulses per second per units of measure (litres/minute in
    // this case) coming from the sensor.
    flowRate = ((1000.0 / (millis() - oldTime)) * pulseCount) / calibrationFactor;

    // Note the time this processing pass was executed. Note that because we've
    // disabled interrupts the millis() function won't actually be incrementing right
    // at this point, but it will still return the value it was set to just before
    // interrupts went away.
    oldTime = millis();

    // Divide the flow rate in litres/minute by 60 to determine how many litres have
    // passed through the sensor in this 1 second interval, then multiply by 1000 to
    // convert to millilitres.
    flowMilliLitres = (flowRate / 60) * 1000;

    // Add the millilitres passed in this second to the cumulative total
    totalMilliLitres += flowMilliLitres;

    unsigned int frac;

    // Print the flow rate for this second in litres / minute
    Serial.print("Flow rate: ");
    Serial.print(int(flowRate));  // Print the integer part of the variable
    Serial.print("L/min");
    Serial.print("\t");       // Print tab space

    // Print the cumulative total of litres flowed since starting
    Serial.print("Output Liquid Quantity: ");
    Serial.print(totalMilliLitres);
    Serial.println("mL");
    Serial.print("\t");       // Print tab space
    Serial.print(totalMilliLitres / 1000);
    Serial.print("L");


    // Reset the pulse counter so we can start incrementing again
    pulseCount = 0;

    // Enable the interrupt again now that we've finished sending output
    attachInterrupt(sensorInterrupt, pulseCounter, FALLING);
  }


  // set http param value
  gprsSerial.println("AT+HTTPPARA=\"URL\",\"http://210.16.100.71:8090/watersupply/webservices/test.php?flowratereading=1500\"");
  delay(2000);
  toSerial();

  // set http action type 0 = GET, 1 = POST, 2 = HEAD
  gprsSerial.println("AT+HTTPACTION=0");
  delay(6000);
  toSerial();

  // read server response
  gprsSerial.println("AT+HTTPREAD");
  delay(1000);
  toSerial();

  gprsSerial.println("");
  delay(10000);
}

void toSerial()
{
  while (gprsSerial.available() != 0)
  {
    Serial.write(gprsSerial.read());
  }
}
void pulseCounter()
{
  // Increment the pulse counter
  pulseCount++;
}

#include <SoftwareSerial.h> SoftwareSerial gprsSerial(7, 8); byte sensorInterrupt = 0; // 0 = digital pin 2 byte sensorPin = 2; // The hall-effect flow sensor outputs approximately 4.5 pulses per second per // litre/minute of flow. float calibrationFactor = 4.5; volatile byte pulseCount; float flowRate; unsigned int flowMilliLitres; unsigned long totalMilliLitres; unsigned long oldTime; void setup() { gprsSerial.begin(19200); Serial.begin(19200); pinMode(sensorPin, INPUT); digitalWrite(sensorPin, HIGH); pulseCount = 0; flowRate = 0.0; flowMilliLitres = 0; totalMilliLitres = 0; oldTime = 0; // The Hall-effect sensor is connected to pin 2 which uses interrupt 0. // Configured to trigger on a FALLING state change (transition from HIGH // state to LOW state) attachInterrupt(sensorInterrupt, pulseCounter, FALLING); Serial.println("Config SIM900..."); delay(2000); Serial.println("Done!..."); gprsSerial.flush(); Serial.flush(); // attach or detach from GPRS service gprsSerial.println("AT+CGATT?"); delay(100); toSerial(); // bearer settings gprsSerial.println("AT+SAPBR=3,1,\"CONTYPE\",\"GPRS\""); delay(2000); toSerial(); // bearer settings gprsSerial.println("AT+SAPBR=3,1,\"APN\",\"uninor\""); delay(3000); toSerial(); // bearer settings gprsSerial.println("AT+SAPBR=1,1"); delay(2000); toSerial(); // bearer settings gprsSerial.println("AT+SAPBR=2,1"); delay(3000); toSerial(); gprsSerial.println("AT+HTTPINIT"); delay(2000); toSerial(); } void loop() { if ((millis() - oldTime) > 1000) // Only process counters once per second { // Disable the interrupt while calculating flow rate and sending the value to // the host detachInterrupt(sensorInterrupt); // Because this loop may not complete in exactly 1 second intervals we calculate // the number of milliseconds that have passed since the last execution and use // that to scale the output. We also apply the calibrationFactor to scale the output // based on the number of pulses per second per units of measure (litres/minute in // this case) coming from the sensor. flowRate = ((1000.0 / (millis() - oldTime)) * pulseCount) / calibrationFactor; // Note the time this processing pass was executed. Note that because we've // disabled interrupts the millis() function won't actually be incrementing right // at this point, but it will still return the value it was set to just before // interrupts went away. oldTime = millis(); // Divide the flow rate in litres/minute by 60 to determine how many litres have // passed through the sensor in this 1 second interval, then multiply by 1000 to // convert to millilitres. flowMilliLitres = (flowRate / 60) * 1000; // Add the millilitres passed in this second to the cumulative total totalMilliLitres += flowMilliLitres; unsigned int frac; // Print the flow rate for this second in litres / minute Serial.print("Flow rate: "); Serial.print(int(flowRate)); // Print the integer part of the variable Serial.print("L/min"); Serial.print("\t"); // Print tab space // Print the cumulative total of litres flowed since starting Serial.print("Output Liquid Quantity: "); Serial.print(totalMilliLitres); Serial.println("mL"); Serial.print("\t"); // Print tab space Serial.print(totalMilliLitres / 1000); Serial.print("L"); // Reset the pulse counter so we can start incrementing again pulseCount = 0; // Enable the interrupt again now that we've finished sending output attachInterrupt(sensorInterrupt, pulseCounter, FALLING); } // set http param value gprsSerial.println("AT+HTTPPARA=\"URL\",\"http://210.16.100.71:8090/watersupply/webservices/test.php?flowratereading=1500\""); delay(2000); toSerial(); // set http action type 0 = GET, 1 = POST, 2 = HEAD gprsSerial.println("AT+HTTPACTION=0"); delay(6000); toSerial(); // read server response gprsSerial.println("AT+HTTPREAD"); delay(1000); toSerial(); gprsSerial.println(""); delay(10000); } void toSerial() { while (gprsSerial.available() != 0) { Serial.write(gprsSerial.read()); } } void pulseCounter() { // Increment the pulse counter pulseCount++; }

以上程序中的AT命令没有立即执行并显示错误：串行监视器上的结果如下所示：

这些执行的命令分别像Charm一样工作。

Answer 1

这里的主要问题是，当您调用delay而不是读取和解析从调制解调器返回的响应时，任何内容都无法可靠地工作。您必须阅读并解析回复的回复。

尝试使用delay与踢狗一样有用，它们会妨碍他们移动。是的它可能实际上有效，但在某些时候你会抱歉采取这种方法......

有关如何正确执行此操作的一些准则，请参阅this answer。我怀疑你可能正在中止一些命令，请参阅this answer的第一部分，了解更多相关细节。

附注：您应该始终在尽可能短的时间内禁用中断，因此您绝对应该将所有Serial.print移至attachInterrupt之后。

AT命令无法在程序中执行

1 个答案: