So i've been trying to connect my HC-05 BT module to PC. I'm sure i connected everything correct, i'm not new with arduino stuff. What i try to do now is i want to communicate with arduino using uart connection via BT. I have arduino leonardo, and here is my code:
void setup()
{
Serial1.begin(9600);
pinMode(LED_BUILTIN, OUTPUT);
}
void loop()
{
if (Serial1.available()>0) {
String ainfo;
ainfo = Serial1.readStringUntil('\n');
if (ainfo.equals("ON"))
{
digitalWrite(LED_BUILTIN, HIGH);
Serial1.println("LED On");
}
else if (ainfo.equals("OFF"))
{
digitalWrite(LED_BUILTIN, LOW);
Serial1.println("LED Off");
}
}
}
(i use Serial1, because Leonardo...) I connected HC-05 with PC, i mean i 'paired' it, because this is where the problem occurs.
My HC-05 is blinking, and when i open port 20, it stops blinking all the time, instead it blinks twice ever 2 seconds (blink twice, not two second blink). When i type anything to serial monitor, nothing happens. Arduino's RX diod doesn't even blink (i don't know if it should, but when i send data from another app through USB cable, it's blinking, so i think in this example it also should). I've downloaded an app on my phone, and tried to do send anything with a hope it will work, but it didn't, of course HC-05's diod behaved same as when i tried to send data from PC (blinks twice every two seconds). I hope you will find a mistake i make, or maybe the code is bad and that's the reason it's not doing anything.
Every Answer would be appreciated.
Related
I am trying to run a Processing sketch with my Arduino. I got it a few days ago, so I'm pretty much a noob. I made two similar sketches - one in Arduino and one in Processing. The Arduino one does work, while the Processing sketch doesn't, even though when running the Processing one, the RX lights up on the board.
I have connected an LED into the D9 on the board, with a 220 ohm resistor, and plugged the other leg into the GND. I then proceeded to run the Arduino sketch, which is a simple one, it lights up and down the LED for a second. This one worked.
I then tried running the Processing sketch, exact same code ( adapted for Processing ) using the library for Arduino, and the board seems to communicate with my sketch, as the RX is blinking each second on the board ( I tried different intervals of time and they match with the intervals at which the RX blinks ), but the LED does not turn on and off, like it did with the Arduino sketch.
I tried getting only a serial connection between the Arduino, and it worked - I connected a joystick module to the Arduino and sent the X and Y through the serial port, and the Processing sketch received the information through the serial port, so they are, indeed, communicating.
The port used is COM3 and is running at 9600 baud.
This is the Arduino sketch :
void setup() {
pinMode(9, OUTPUT);
}
void loop() {
digitalWrite(9, HIGH);
delay(1000);
digitalWrite(9, LOW);
delay(1000);
}
and this is the Processing ( version 3.4 ) sketch :
import processing.serial.*;
import cc.arduino.*;
Arduino arduino;
void setup() {
arduino = new Arduino(this, Arduino.list()[0], 9600);
arduino.pinMode(9, Arduino.OUTPUT);
}
void draw() {
arduino.digitalWrite(9, Arduino.HIGH);
delay(1000);
arduino.digitalWrite(9, Arduino.LOW);
delay(1000);
}
Well done on step by step debugging such as double checking the wiring on the electronics side and testing the blink code with the Arduino alone to isolate the issue.
If the Blink sketch is the only Arduino code you have uploaded to your board that won't suffice. Processing does send messages to Arduino (which is why you see the RX LED turn on), but there's nothing in the Arduino code that initialises Serial communication
As you can see in that example, in setup() Serial communication is initialised with 9600 baud rate (communication speed, 9600 bytes/chars per second):
Serial.begin(9600);
Then in draw() if there is data available, each character is read, then printed one at a time with a prefixed message:
// send data only when you receive data:
if (Serial.available() > 0) {
// read the incoming byte:
incomingByte = Serial.read();
// say what you got:
Serial.print("I received: ");
Serial.println(incomingByte, DEC);
}
If you upload the example linked, if you've got a single Serial port, you should see both the RX then ever so slightly after the TX LED blinking when you run your Processing sketch. If you close that sketch, open Serial Monitor in Arduino and type something then press enter you'll see the debugging message read back from Arduino.
Using these notions you could write a basic sketch like so:
int incomingByte = 0; // for incoming serial data
void setup() {
pinMode(9, OUTPUT);
Serial.begin(9600);
}
void loop() {
// send data only when you receive data:
if (Serial.available() > 0) {
// read the incoming byte:
incomingByte = Serial.read();
// say what you got:
Serial.print("I received: ");
Serial.println(incomingByte, DEC);
// if we received ASCII character '1', turn LED on
if(incomingByte == '1'){
digitalWrite(9,HIGH);
}
// if we received ASCII character '0', turn LED off
if(incomingByte == '0'){
digitalWrite(9,LOW);
}
}
}
Uploading this sketch to your Arduino should allow you to type 1 into Serial Monitor and press Enter to turn the LED on or 0 to turn it off.
The only thing left is to send the same data from Processing:
import processing.serial.*;
Serial arduino;
void setup(){
try{
arduino = new Serial(this, Serial.list()[0], 9600);
}catch(Exception e){
println("error connecting to serial port, double chek USB connection, serial port and close other programs using Serial");
e.printStackTrace();
}
}
void draw(){
}
void keyPressed(){
if(key == '1'){
if(arduino != null){
arduino.write('1');
}else{
println("arduino serial connection wasn't initialised");
}
background(255);
}
if(key == '0'){
if(arduino != null){
arduino.write('0');
}else{
println("arduino serial connection wasn't initialised");
}
background(0);
}
}
Minor side note: notice I'm not using delay() in Processing, I recommend using millis() instead as it doesn't block the execution of code like delay() does.
So the above looks like quite a bit of code just to blink an LED but the point is to understand the basics of Serial communication which will be useful on the long run:
initialising serial communication with Arduino (understand baud rate)
basic reading/writing of bytes over Serial
initialising serial communication from Processing and sending data
Back to your original question, you've missed an important detail regarding the Arduino library you're using in Processing: it's relying on a special Arduino sketch (firmware) called Firmata. You will be able to read more on that and how to use the library in this Arduino and Processing tutorial.
As the tutorial mentions you need to first upload this sketch from Arduino > Examples > Firmata > StandardFirmata. Also bare in mind baud rate is set to 57600, not 9600 so you need to update your code like so:
arduino = new Arduino(this, Arduino.list()[0], 57600);
To use: are you sure to put the standardfirmata
Using the Arduino software, upload the StandardFirmata example (located
in Examples > Firmata > StandardFirmata) to your Arduino board.
change the line
arduino = new Arduino(this, Arduino.list()[0], 9600);
to:
arduino = new Arduino(this, "COM3", 57600); // in Firmata -> Firmata.begin(57600);
you could add this line to look after your serial port:
println(Arduino.list());
Modify the "arduino = new Arduino(...)" line below, changing the number in Arduino.list()[0] to the number corresponding to the serial port of your Arduino board. Alternatively, you can replace Arduino.list()[0] with the name of the serial port, in double quotes, e.g. "COM3" on Windows or "/dev/tty.usbmodem621" on Mac.
I got it working with Arduino but I had to change some details. My port was "COM3" or Arduino.list()[1] (the 2nd port on the list) which you can check in Windows device manager (Ports COM & LPT: USB-SERIAL) after installing the latest drivers (maybe on the usb port that appears when you connect your Arduino under other devices) using the system update and restarting, then you may need to repeat the system update and restart 2 or 3 times. Or on Linux, you can find which port it's on with:
ls /dev/ttyUSB*
Then unplug it and check it again.
First I had to upload the Arduino IDE program (running it with the serial monitor window from the tools menu ctrl-shft-m after having the same exact baud rate on the lower right menu option as in the program). Then I could close it and compile the processing one as long as I had input that very same baud rate into the Processing program too. All 3 different bauds that I tried, 9600, 57600, 115200, worked requiring their equality between Arduino IDE, Arduino IDE Serial Monitor and Processing. If I uploaded a different project in IDE, then Processing did not even connect to the Arduino, so it had to be that same project running on it for Processing to communicate with Arduino Uno properly. Processing is basicly USING Arduino IDE by sending or receiving messages already programmed for it to do, it doesn't program the Arduino in this case. I have even gone through a big mess, trying to get Visual Micro to work (Arduino on Visual Studio) cross-platform but it still would not allow me to link other libraries and headers because of how picky Arduino's programming is! One of the best ways to learn is to check the actual arduino.cc or Processing manual command parameters after finding out where your problem is.
I have purchased a brand new Arduino Uno today. While it was connected to the PC, the LED (pin 13) was always remaining on. I have uploaded a blank program, but the LED doesn't go off.
Help me with this issue, please. I am in a fix about it.
The Arduino does not remember any states which have been set before a new program start. Without setting the digital port 13 the LED is turned on. You can set the port 13 by program (using it as output port) or you pull down the port by connecting it to ground (using it as input port).
Also see tutorial about digital pins on the Arduino website.
void setup() {
pinMode(LED_BUILTIN, OUTPUT);
}
void loop() {
digitalWrite(LED_BUILTIN, LOW);
}
I am using arduino uno to make a sound detector.
I uploaded a program, found error in the code that it returns unintended numbers unreasonably big. I also think I used wrong code for the module, but it was connected in the way that can work properly with the proper code.
The code I uploaded was:
const int ledPin =13;
const int middleValue = 512;
const int numberOfSamples =128;
int sample;
long signal;
long averageReading;
long runningAverage = 0;
const int averagedOver = 16;
const int threshold=400;
void setup(){
pinMode(ledPin, OUTPUT)
Serial.begin(9600)
}
void loop(){
long sumOfSquares = 0;
for (int i=0; i<numberOfSamples; i++){
sample = analogRead(0);
signal = (sample - middleValue);
signal *= signal;
sumOfSquares += signal;
}
averageReading = sumOfSquares/numberOfSamples;
runningAverage=(((averagedOver -1 )*runningAverage)+averageReading)/averagedOver;
if(runningAverage>threshold){
digitalWrite(ledPin, HIGH);
}else{
digitalWrite(ledPin, LOW);
}
Serial.println(runningAverage);
}
When the arduino suddenly stopped sending serial numbers, I pressed reset button and uploaded the default code:
void setup() {
}
void loop() {
}
but now it shows that it cannot connect to COM3 (arduino) and cant find the device, When I can see arduino uno successfully connected to PC using device manager (windows 8.1). The led light of arduino also turns on when I connect it to power source or usb.
it shows "port not found" when I click to see the serial output
Did I just fry Arduino?
How should I fix this?
Also, i checked the led pin 13 blinking three times when i plug in the usb. I just cant upload anything
What worked for me:
Tools>Port>(your COM)
Just selecting that solved the error.
You should do a few checks in order to jump to a conclusion, your Arduino may be just fine. As far as I know, Code cannot destroy a controller.
Check if any other software is using the same serial port. Two softwares cannot use the same serial port at the same time
Restart your PC and then try again
Remove the Microcontroller from the board, connect it to the PC and try to open the com port. If it opens then connect your Tx pin with the Rx pin, send some data and check if you are getting the data back. This way you will ensure your USB-TTL converter is fine
If this goes successful, then insert your microcontroller in some other board and check if it is getting programmed
I am sure after these checks you will find out the reason of the failure of your board/microcontroller.
Yes, check everything.... especially the USB cable or the USB port. It is crucial. My problem was just dirt on the computer USB port. Dirt, dust and grime. Crazy isn't it ? Just clean up the USB port and connector and the problem solve.
I also had a same problem and solved it.
try this one.
1. disconnect all cables from your arduino
2. connect external power
3. connect usb cable
4. then upload it.
I used my arduino with CNC shield(GRBL) and plugged external power to arduino.
after this. it was not possible to upload new firmware to arduino with usb cable only.
Once you success to upload with usb + external power then you can upload any firmware with usb cable only.
To solve the problem.
Method-1:
Go to Tools>Port>Select the Port
Method-2:
Unplug your board and plug it back in.
Method-3:
Restart your computer or laptop and reinstall Arduino software.
For more details you can visit "https://arduinopoint.com/fix-most-common-error-uploading-to-arduino/"
I have a realy weird problem with my xBee S1 Pro moduls. I used the XCTU software to configure them. I set one Arduino to recive data and the other one to transmit. When i use the XCTU Software to send some testframes, it works, the reciver gets the data. But if i want my arduinos to communicate it dosent work. I assume that the moduls are configured the right way because PC -> Arduino works. So i'll provide the Sketches so you can tell me whats going wrong
reciver
void setup()
{
pinMode(13, OUTPUT);
Serial.begin(9600);
}
void loop()
{
if(Serial.available() > 0){
digitalWrite(13, HIGH);
delay(500);
digitalWrite(13, LOW);
Serial.print("recived some data: ");
Serial.println(Serial.read());
Serial.flush();
}
}
and now the sender
void setup()
{
pinMode(13, OUTPUT);
Serial.begin(9600);
}
void loop()
{
Serial.println("data");
Serial.flush();
digitalWrite(13, HIGH);
delay(1000);
digitalWrite(13, LOW);
delay(4000);
}
whats wrong? any ideas?
I would check the connections to the Xbee, i.e. make sure that RX is actually connected to DOUT and TX is connected to DIN. Also if you are sending actual "Frames" then it sounds like you are running your xbees in api mode so you will need to do more then just send out "data" what you want is for it to be running in serial pass through mode.
One last thing to check is if you are using arduino Leonardo or Micro the hardware Serial port is Serial1 not Serial.
You're using the same Serial port for communicating with XBee and USB. That's the problem. You need to set another Serial port instead of the used for USB to communicate with XBee.
It will be good if you share what arduino boards and shields you are using.
So first thing is first... If these xBees have separate passcodes at a different baud rate, shit is going to happen. Also what command mode are these in (AT or API)? Factory default settings ? Accepting AT commands to change these ? (By default you are in AT mode)
Open a serial program (I use coolTerm for OS X ). Ensure to setup correctly of these steps.
Once you know these transmitters are talking at the same baud, passcode, etc... Ensure you have the code uploaded to your Arduinos BEFORE connecting these transmitters to the RX/TX pins with a simple serial read and write.
The code seems right, but make sure what you are trying to send. Xbees can transmit and receive 8bit data only.
First send a known byte of data such as a=100; and see whether this data receives there perfectly or not.
I have been unable to use the serial monitor with the Arduino YUN, I can download the compiled sketch with IDE 1.5.5 (on Windows XP via the USB connector that appears as COM6), the serial monitor opens but displays nothing. In order to investigate I modified the Blink example sketch as follows:
/*
Blink
Turns on an LED on for one second, then off for one second, repeatedly.
This example code is in the public domain.
*/
// Pin 13 has an LED connected on most Arduino boards.
// give it a name:
int led = 13;
// the setup routine runs once when you press reset:
void setup() {
// initialize the digital pin as an output.
pinMode(led, OUTPUT);
Serial.begin(9600);
while (!Serial) {;}
Serial.println("Blink Program");
}
// the loop routine runs over and over again forever:
void loop() {
digitalWrite(led, HIGH); // turn the LED on (HIGH is the voltage level)
Serial.println("Blink Program -H");
delay(5000); // wait for a second
digitalWrite(led, LOW); // turn the LED off by making the voltage LOW
Serial.println("Blink Program -L");
delay(5000); // wait for a second
}
The sketch upoloads and runs, I see the LED blinking, it does not wait for SerialMonitor to open. The SerialMonitor displays nothing. I have noticed that during the upload COM6 disappers from the Windows device manager, a new port COM7 appears, the upload completes successfully, COM7 disappears and COM6 reappears.
I have also found that the YunSerialTerminal example is not working.
Do other people have successfully used the IDE 1.5.5 SerialMonitor on Windows XP?
Should I conclude that my Arduino Yun board is malfunctioning?
Any help would be greatly appreciated.
I had the same problem. A reset on 32U4 solved the problem (the button on the left top corner, next to the Ethernet connector). The serial port appeared on the arduino 1.5.x IDE and the connection was established and the data received.
Bridge and Console should be used when the selected port is the wifi one, not the real serial port.
I hope that helps.
Best,
I am running 1.5.5 and had a similar problem. Console.begin() and Bridge.begin() work just fine. Serial gives me nothing. I started with the following.
void setup() {
// for debugging, wait until a serial console is connected
Serial.begin(9600);
delay(4000);
while(!Serial);
Serial.print("Initializing the bridge...");
Bridge.begin();
Serial.println("Done");
}
void loop()
{
Serial.println("running...");
}
Try to change your USB cable(needs to be USB data cable) and Port settings in Arduino IDE. Tools-->Port-->COM6(Arduino Yun).
This solved my problem in Windows.