Forum >Only get data on iOS app if Serial Monitor is open

Only get data on iOS app if Serial Monitor is open

info 2018-02-09 15:40:21 2132 Views2 Replies
Ive run into an issue that seems to be common but unanswered. I have a sketch that sends data from the bluno nano to an iOS app (BlunoTerminal or the DFRobot BlunoTestDemo app).

The app gets(null) until I open the serial monitor, then I start getting my data. If I power the bluno from a USB-battery pack I get null but worst of all, I cant open a serial monitor in order to get my data because the bluno is not connected to a computer.

Can anyone offer a solution for this?

Here is my sketch with a hard coded data value of 454:
Code: Select all
byte statusLed = 13; byte sensorInterrupt = 0; // 0 = digital pin 2 byte sensorPin = 2; float calibrationFactor = 4.5; volatile byte pulseCount; float flowRate; unsigned int flowMilliLitres; unsigned long totalMilliLitres; unsigned long oldTime; void setup(){ Serial.begin(38400); pinMode(statusLed, OUTPUT); digitalWrite(statusLed, HIGH); // We have an active-low LED attached pinMode(sensorPin, INPUT); digitalWrite(sensorPin, HIGH); pulseCount = 0; flowRate = 0.0; flowMilliLitres = 0; totalMilliLitres = 0; oldTime = 0; attachInterrupt(sensorInterrupt, pulseCounter, FALLING); } void loop(){ if((millis() - oldTime) > 5000) { // Only process counters once per second detachInterrupt(sensorInterrupt); flowRate = ((1000.0 / (millis() - oldTime)) * pulseCount) / calibrationFactor; oldTime = millis(); flowMilliLitres = (flowRate / 60) * 1000; totalMilliLitres += flowMilliLitres; unsigned int frac; frac = (flowRate - int(flowRate)) * 10; sendOverBLE(); pulseCount = 0; attachInterrupt(sensorInterrupt, pulseCounter, FALLING); } } void pulseCounter(){ pulseCount++; } void sendOverBLE() { int mystring; mystring = int(454); Serial.println(mystring);//send what has been received Serial.println(); //print line feed character }

2018-09-15 23:05:26 I am also having this problem. Did you find a solution? cosmoskebabs

2018-05-14 03:10:14 I've similar problem with android app. Sending data to bluno beetle and works only with Serial Monitor connected. kesser

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	byte statusLed = 13;
	byte sensorInterrupt = 0; // 0 = digital pin 2
	byte sensorPin = 2;
	float calibrationFactor = 4.5;
	volatile byte pulseCount;
	float flowRate;
	unsigned int flowMilliLitres;
	unsigned long totalMilliLitres;
	unsigned long oldTime;

	void setup(){
	Serial.begin(38400);
	pinMode(statusLed, OUTPUT);
	digitalWrite(statusLed, HIGH); // We have an active-low LED attached
	pinMode(sensorPin, INPUT);
	digitalWrite(sensorPin, HIGH);
	pulseCount = 0;
	flowRate = 0.0;
	flowMilliLitres = 0;
	totalMilliLitres = 0;
	oldTime = 0;
	attachInterrupt(sensorInterrupt, pulseCounter, FALLING);
	}

	void loop(){
	if((millis() - oldTime) > 5000) { // Only process counters once per second
	detachInterrupt(sensorInterrupt);
	flowRate = ((1000.0 / (millis() - oldTime)) * pulseCount) / calibrationFactor;
	oldTime = millis();
	flowMilliLitres = (flowRate / 60) * 1000;
	totalMilliLitres += flowMilliLitres;
	unsigned int frac;
	frac = (flowRate - int(flowRate)) * 10;

	sendOverBLE();
	pulseCount = 0;
	attachInterrupt(sensorInterrupt, pulseCounter, FALLING);
	}
	}

	void pulseCounter(){
	pulseCount++;
	}

	void sendOverBLE() {
	int mystring;
	mystring = int(454);
	Serial.println(mystring);//send what has been received
	Serial.println(); //print line feed character

	}