I'm trying to get my arduino to communicate with a processing program. Every time I do it I get this error:
"Error opening serial port /dev/tty.usbmodem1441: Port busy". My arduino is using the same port.
Here is my processing code:
import processing.serial.*;
Serial myPort;
String val;
void setup()
{
String portName = Serial.list()[5];
myPort = new Serial(this, portName, 9600);
}
void draw()
{
if ( myPort.available() > 0) {
val = myPort.readStringUntil('\n');
}
println(val);
}
I got it from https://learn.sparkfun.com/tutorials/connecting-arduino-to-processing and I didn't change anything.
If you have the Arduino serial monitor open, attempting to connect to the serial line with Processing will create a conflict, resulting in that error. Simply close the serial monitor and try starting the sketch again. (Maybe reset Arduino too by clicking Reset button near AREF)
You cant use same port for two diffrent purpose at a same time.
check if that is the case. If thats not the case then try restarting arduino and pc both.
also make sure you are connected to the right port.
ls -l /dev/tty.* should return all connected dvices if you are in unix system
if you are in window, may be its under device mager(its been long time i used window)
Just close the "Serial Monitor" in Arduino and everything will work fine
Related
I am working with an arduino, rather learning to use it, I bought the esp8266 module to transmit data over wifi, but every time I upload a script it throws me the following error:
Failed to connect ESP8266: Invalid head to Packet (0xf0)
The selected port does not exist or the board is not connected
I already installed the drivers and libraries, select the COM4 port and checked in the device manager that it is correct.
As I was asked, here is the code I am trying to use.
#include <SoftwareSerial.h>
void setup()
{ Serial.begin(115200);
BT1.begin(115200);
}
void loop()
{ String B= "." ;
if (BT1.available())
{ char c = BT1.read() ;
Serial.print(c);
}
if (Serial.available())
{ char c = Serial.read();
BT1.print(c);
}
}
I connected the arduino via usb, the esp8266 using the breadboard, it is an ESP8266 ESP-01.
I hope you can help me.
(It's my first time on this site, sorry for the lack of info the first time)
actually i have Qt code. so i need to send data of packets from serial port to terminal and display the data in terminal and also from terminal i need to read data and display it in Qt window page. main problem is, for serial communication to terminal, does we really require serial port should connect to some hardware devices and also.. can we write and read data to terminal without connecting any serial port to hardware devices.
the code from Transceiver layer to serial port
Transceiver::Transceiver(QObject *parent)
:
QObject(parent),
mSerial(new QSerialPort(this))
{
mSerial->setPortName(QString("COM1"));
qint32 baudRate = 9600;
mSerial->setBaudRate(baudRate);
mSerial->setDataBits(QSerialPort::Data8);
mSerial->setParity(QSerialPort::NoParity);
mSerial->setStopBits(QSerialPort::OneStop);
connect
(
mSerial,
&QSerialPort::readyRead,
[ this ]()
{
QByteArray data = mSerial->readAll();
OnDataReceived( data );
qDebug()<<data;
}
);
}
Transceiver::~Transceiver()
{
mSerial->close();
}
void
Transceiver::Send_Data(const QByteArray & inDataStream )
{
qDebug()<<"Data_in_Transceiver_layer :"<<inDataStream;
mSerial->write(inDataStream);
}
bool
Transceiver::OpenConnection()
{
mSerial->open(QIODevice::ReadWrite);
QSerialPort::SerialPortError error = m`enter code here`Serial->error();
return error == QSerialPort::NoError;
// connect(mSerial, SIGNAL(readyRead()), this, SLOT(read_data()));
}
when i run this it shows
QIODevice::write (QSerialPort): device not open
I am quite rusty when it comes to Serial ports. I want to send an AT command to a GSM/ GPRS shield connected to my Arduino UNO. The AT command I want to pass in particular is the command to get a networks signal strength.
I am using the SIM900 and SoftwareSerial library to send the command as the GSM library does not compile correctly for me. Meaning I have to use the SoftwareSerial library.
I have this example code from the SIM900 library working that relies on reading inputs from the serial monitor to carry out commands but I need it to be automated and the command to be passed in hardcoded. In this example code, the place of interest is the simplehwread() method.
#include "SIM900.h"
#include <SoftwareSerial.h>
int numdata;
char inSerial[40];
int i=0;
void setup()
{
//Serial connection.
Serial.begin(9600);
Serial.println("GSM Shield testing.");
//Start configuration of shield with baudrate.
//For http uses is raccomanded to use 4800 or slower.
if (gsm.begin(9600))
Serial.println("\nstatus=READY");
else Serial.println("\nstatus=IDLE");
};
void loop()
{
//Read for new byte on serial hardware,
//and write them on NewSoftSerial.
serialhwread();
//Read for new byte on NewSoftSerial.
serialswread();
};
void serialhwread()
{
i=0;
if (Serial.available() > 0) {
while (Serial.available() > 0) {
inSerial[i]=(Serial.read());
delay(10);
i++;
}
inSerial[i]='\0';
if(!strcmp(inSerial,"/END")) {
Serial.println("_");
inSerial[0]=0x1a;
inSerial[1]='\0';
gsm.SimpleWriteln(inSerial);
}
//Send a saved AT command using serial port.
if(!strcmp(inSerial,"TEST")) {
Serial.println("SIGNAL QUALITY");
gsm.SimpleWriteln("AT+CSQ");
} else {
Serial.println(inSerial);
gsm.SimpleWriteln(inSerial);
}
inSerial[0]='\0';
}
}
void serialswread()
{
gsm.SimpleRead();
}
No matter how I modify this code, the command does not get passed in and response displayed while the method here does it but not the way I want it to be done. i.e Direct input. Could anyone assist here?
i have dealt with exactly this scenario at a company with a cellular radio on board. there are many status signals that come over and if not dealt with appropriately these status flags from the cell modem will be lost
you need to look at the data sheets associated with your cell modem and its protocol so you know what flags to watch for at the various steps taken along the way from configuration, to eventual connection to cellular service.
multi-threaded coding techniques must be followed as well.
keep in mind that the comm channel is not ideal and there WILL be failures. provided your coding techniques are sound and you follow protocol requirements, then it should work.
Ron
Boise, ID
I Am using Arduino UNO and SIM900A module for GSM + ARDUINO based communication.I used following code to call a specific number but nothing happens,
void setup()
{
Serial.begin(9600);
delay(10000);
}
void loop()
{
Serial.println("ATDTxxxxxxxxxx;"); //where xxxxxxxxxx is a 10 digit mobile number
delay(30000); // wait 20 seconds.
Serial.println("ATH"); // end call
do // remove this loop at your peril
{
delay(1);
}
while (1>0);
}
whereas when i used ATDTxxxxxxxxxx; in minicom while communicating with SIM900A module, i was able to call(AS ATDxxxxxxxxxx was giving No carrier error, so i used " ; ").Similr is the case with Sending message. I am getting "+CMS ERROR: 302" while i am using
AT+ CMGF=1
AT+CMGS="Mobno." //after this i get the error.
I am not able to send the message through minicom + SIM900A GSM module and i want to test it with Arduino.I think i am having some problem with settings of SIM or either module.I even tried to reset the settings of SIM , but nothing worked out.
First of all: never, never ever use delay instead of proper waiting by parsing the actual response given by the modem. And you must read back the responses given by the modem and wait for the final result code before proceeding to the next command. See this answer and this answer for more details (especially regarding proper AT+CMGS handling).
A list of all the CMS ERRORs are defined in 27.005 in the section 3.2.5 Message Service Failure Result Code +CMS ERROR. Does your subscription allow sending SMS (most likely, but just to be sure check this. Test sending an sms using this sim inserted into another mobile phone)? What message storage are you using? Are you sure the gsm module supports text mode?
I solve the problem just use this code:
void setup()
{
Serial.begin(9600);
delay(10000);
}
void loop()
{
Serial.println("ATD+60148266823;"); //where xxxxxxxxxx is a 10 digit mobile number
delay(30000); // wait 20 seconds.
Serial.println("ATH"); // end call
do // remove this loop at your peril
{
delay(1);
} while (1>0);
}
void setup(){
Serial.begin(9600);
}
void loop(){
Serial.println("AT");
delay(500);
Serial.print("ATD");
Serial.println("99XXXXXXX8;");
delay(20000);
Serial.println("ATH");
}
I have a simple sketch on my Seeeduino Mega 1.22 which just displays the serial input on a LCD Display. Using lynx term and the arduino serial monitor works fine: sent input is being displayed. The trouble starts when I want to start serial communication between my Java programm, running in Eclipse on a Win7 x64 machine, and the Seeeduino. I'm using the RXTX x64 build. The programm is intended to send and receive some string.getBytes() via the open port. Receiving on the Java side works, but receiving on the Arduino side fails.
It seems that the problem is the proper Flow Control setting. I saw that some people had the same issue like here Issues receving in RXTX
But this solution does not work for me. If I set the FlowControl to None, than I get only a block icon on the display, indicating, that the serial connection has been established, but nothing else. If I set the FlowControl to RCTS_IN | RCTS_OUT, then I get the string bytes only on the display when I close the established connection.
Why is the data only send when I close the connection (Flushing the out stream did not help as well) ? What am I doing wrong with the Flow Controll settings?
This is the modified connect() method I'm using.
void connect(String portName) throws Exception {
CommPortIdentifier portIdentifier = CommPortIdentifier
.getPortIdentifier(portName);
if (portIdentifier.isCurrentlyOwned()) {
System.out.println("Error: Port is currently in use");
} else {
CommPort commPort = portIdentifier.open(this.getClass().getName(),
2000);
if (commPort instanceof SerialPort) {
SerialPort serialPort = (SerialPort) commPort;
serialPort.setSerialPortParams(115200, SerialPort.DATABITS_8,
SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
try {
serialPort.setFlowControlMode(
// SerialPort.FLOWCONTROL_NONE);
// OR
// If CTS/RTS is needed
//serialPort.setFlowControlMode(
SerialPort.FLOWCONTROL_RTSCTS_IN |
SerialPort.FLOWCONTROL_RTSCTS_OUT);
} catch (UnsupportedCommOperationException ex) {
System.err.println(ex.getMessage());
}
serialPort.setRTS(true);
in = serialPort.getInputStream();
out = serialPort.getOutputStream();
(new Thread(new SerialWriter(out))).start();
serialPort.addEventListener(new SerialReader(in, this));
serialPort.notifyOnDataAvailable(true);
} else {
System.out.println("Error: Only serial ports are to use!");
}
}
}
Thanks in advance for your time
Solved it. It was not the buffer, as many suggested it. The problem was, that the Seeeduinos RST Switch on the board was set to automatic. Setting it to manual, solved the problem.
No Flow-Controll needed.