I am using BluetoothChat code on the Android side to send an ON/OFF signal (I am sending 110, 119 or other cases as defined below) to the Arduino UNO using the chat box, but when I display the received value, it shows strange values in the Arduino Serial monitor, that is, 255, 254, 250 or 245 and replies with strange values on the Android side too.
but suprisingly only single condition among 110, 119, etc gets true when i send these commands from android and no other instruction/LED gets properly executed/turned ON/off.
Can any one help me figure out the problem? Below is my arduino code.
int data;
String message;
void setup ()
{
Serial.begin (57600);
pinMode (6, OUTPUT);
pinMode (7, OUTPUT);
pinMode (8, OUTPUT);
pinMode (9, OUTPUT);
pinMode (10, OUTPUT);
digitalWrite(6, LOW); // off LED 1 at pin6
digitalWrite(7, LOW); // off LED 2 at pin7
digitalWrite(8, LOW); // off LED 3 at pin8
digitalWrite(9, LOW); // off LED 4 at pin9
digitalWrite(10, LOW); // off LED 5 at pin10
}
void loop () {
int i=0;
if (Serial.available()>0)
{
int data= Serial.read();
Serial.println (" Received data: ");
Serial.println (data);
if (data==110) //q
{
digitalWrite(6, HIGH); // turn on LED 1 at pin6
message = "LED 1 On";
Serial.println (message);
}
if (data==102) // a
{
digitalWrite(6, LOW); // off LED 1 at pin6
message = "LED 1 Off";
Serial.println (message);
}
if (data==96) //c
{
digitalWrite(7, HIGH); //on LED 2
message = "LED 2 On";
Serial.println (message);
}
if (data==115) //d
{
digitalWrite(7, LOW); // off LED 2
message = "LED 2 Off";
Serial.println (message);
}
if (data==111) //e
{
digitalWrite(8, HIGH); //on LED 3
message = "LED 3 On";
Serial.println (message);
}
if (data==97)// f
{
digitalWrite(8, LOW); //sets the LED 3
message = "LED 3 Off";
Serial.println (message);
}
if (data==107) //g
{
digitalWrite(9, HIGH); //turn on LED 4
message = "LED 4 On";
Serial.println (message);
}
if (data==120)//h
{
digitalWrite(9, LOW); //sets the LED 4
message = "LED 4 Off";
Serial.println (message);
}
if (data==99) //i
{
digitalWrite(10, HIGH); //sets the LED 5
message = "L5 high";
Serial.println (message);
}
if (data==104) //j
{
digitalWrite(10, LOW); //sets the LED 5
message = "LED 5 Off";
Serial.println (message);
}
if (data==112) //y
{
digitalWrite(6, HIGH); // turn on ALL LEDs
digitalWrite(7, HIGH);
digitalWrite(8, HIGH);
digitalWrite(9, HIGH);
digitalWrite(10, HIGH);
message = "ALL LEDs ON";
Serial.println (message);
}
if (data==122)//z
{
digitalWrite(6, LOW); //Turn off all LEDs
digitalWrite(7, LOW);
digitalWrite(8, LOW);
digitalWrite(9, LOW);
digitalWrite(10, LOW);
Serial.println ("ALL LEDs OFF");
}
else
{
digitalWrite(13, HIGH); //sets the LED 5
delay(3000); //3sec
digitalWrite(13, LOW);
delay(3000);
Serial.println (" else case executed ");
} ////end of else
}
data=0;
}
Try char data = Serial.read();
And show Java code for Android.
See 100% work code for Bluetooth Arduino&Android
If you are using Arduino Uno, then you can't use the serial monitor to print values, if you are already using serial to communicate to Bluetooth, since it has only one serial port.
You have to use the Software serial library or use Arduino Mega, which has 4 serial ports.
Related
I have an App that is, besides other things, supposed to alert when the Fire Alarm that I have on my project is triggered. The sensor is a thermistor and it activates a blinking led and a buzzer when the data it is getting is >700. I am using Bluetooth (HC-05) for my connection. I already have on the app a temperature sensor that is supposed to work independently and the readings from the Arduino are already being received, so I can´t mix the values (receive text number of bytes already being used). I was thinking of, e.g. when the led is blinking (meaning that the fire alarm is triggered), it sends some kind of info to the app that notifies me through an extension and the internal Notifier, without entering in conflict with the other blocks.`
visual aspect of app`
blocks of app
[code]
#include <SoftwareSerial.h>
SoftwareSerial BT(10, 11); //TX, RX respetively
float temp;
float seno;
int frequencia;
float temptermistor;
String state;// string to store incoming message from bluetooth
void setup() {
BT.begin(9600);// bluetooth serial communication will happen on pin 10 and 11
Serial.begin(9600); // serial com. to check the data on serial monitor
pinMode(A0, INPUT); //temperatura
pinMode(A1, INPUT); //termistor
pinMode(9, OUTPUT); //led alarme
pinMode(13, OUTPUT); //buzzer
}
void loop() {
temp = analogRead(A0);
delay(200);
temp = analogRead(A0);
temp = temp * 0.48828125;
temptermistor = analogRead(A1);
delay(10);
temptermistor = analogRead(A1);
delay(10);
Serial.println(temp);
BT.println(temp);
delay(250);
if (temptermistor >= 700)
{
digitalWrite(9, HIGH);
delay(50);
digitalWrite(9, LOW);
delay(50);
for(int x=0;x<180;x++){ //converte graus para rad. e obtém o valor do seno
seno=(sin(x*3.1416/180)); //gera uma frequência a partir do valor do seno
frequencia = 2000+(int(seno*1000));
tone(13,frequencia);
delay(2);
}
}
else
{
noTone(13);
}
while (BT.available()){ //Check if there is an available byte to read
delay(10); //Delay added to make thing stable
char c = BT.read(); //Conduct a serial read
state += c; //build the string- either "On" or "off"
}
if (state.length() > 0) {
if(state == "A")
{
digitalWrite(2, HIGH);
}
else if(state == "a")
{
digitalWrite(2, LOW);
}
if(state == "B")
{
digitalWrite(3, HIGH);
}
else if(state == "b")
{
digitalWrite(3, LOW);
}
if(state == "C")
{
digitalWrite(4, HIGH);
}
else if(state == "c")
{
digitalWrite(4, LOW);
}
if(state == "D")
{
digitalWrite(5, HIGH);
}
else if(state == "d")
{
digitalWrite(5, LOW);
}
if(state == "E")
{
digitalWrite(6, HIGH);
}
else if(state == "e")
{
digitalWrite(6, LOW);
}
if(state == "F")
{
digitalWrite(7, HIGH);
}
else if(state == "f")
{
digitalWrite(7, LOW);
}
if(state == "G")
{
digitalWrite(8, HIGH);
}
else if(state == "g")
{
digitalWrite(8, LOW);
}
if(state == "H")
{
digitalWrite(12, HIGH);
}
else if(state == "h")
{
digitalWrite(12, LOW);
}
state ="";}
}
[/code]
For sending the Temperature value and notification message you can use delimiter as like & or some kind of symbol in the BT.println();.
Try something like this
BT.print(temp);
BT.print("&");
BT.println("notification");
When you see the output in Bluetooth terminal you can see output like this.
temp¬ification
temp¬ification
Then at the Mobile App capture that output and break it from the & symbol. then you can grab the two variables.
You can refer these tutorials.
1 2 3
So I have a Bluetooth module that I've created some code for, so that when i push button 1 it turns on the led, when i push 2 it turns off the led, and 3 is supposed to make the led continuously blink. Everything works perfectly fine, except that when i push 3 the led blinks once then stops. What can i do to the code to make it blink continuously until i either hit button 1 or 2 again?
char LED = 0;
void setup() {
pinMode(13, OUTPUT);
Serial.begin(9600); // Opens Serial port
}
void loop() {
if (Serial.available()> 0){
LED = Serial.read();
Serial.print(LED);
if (LED == '1')
digitalWrite(13, HIGH);
if (LED == '0')
digitalWrite(13, LOW);
if (LED == '3') {
digitalWrite(13, HIGH);
delay(1000);
digitalWrite(13, LOW);
delay(1000);
}
}
}
You need to change main loop to:
void loop() {
if (Serial.available()> 0){
LED = Serial.read();
Serial.print(LED);
}
if (LED == '3') {
digitalWrite(13, HIGH);
delay(1000);
digitalWrite(13, LOW);
delay(1000);
}
else if (LED == '1')
digitalWrite(13, HIGH);
else if (LED == '0')
digitalWrite(13, LOW);
}
In this case LED == '3' will be work on every loop iteration, even if Serial is not contain any data
You put the blinking code into the if (Serial.available()> 0) block, which means that it's only run when you send a '3'. You would need to keep sending '3' to keep the LED blinking.
Sergey gave you a working solution, but that code unnecessarily keeps setting the LED on or off, and the code is unresponsive while the LED is blinking because of the use of delay.
To fix those problems you need to use a variable to keep a state (In Sergey's code that role took your existing LED variable) and use millis() instead of delay() for blinking, like in the BlinkWithoutDelay builtin Arduino IDE example.
char LED = 0;
enum {
NONE,
BLINKING,
} state = NONE;
void setup() {
pinMode(BUILTIN_LED, OUTPUT);
Serial.begin(9600); // Opens Serial port
}
void loop() {
if (Serial.available() > 0){
LED = Serial.read();
Serial.print(LED);
switch (LED) {
case '1':
state = NONE;
digitalWrite(BUILTIN_LED, HIGH);
break;
case '2':
state = NONE;
digitalWrite(BUILTIN_LED, LOW);
break;
case '3':
state = BLINKING;
break;
}
}
switch (state) {
case NONE: break;
case BLINKING:
static unsigned long last_blink = 0;
if (millis() - last_blink > 1000)
{
digitalWrite(BUILTIN_LED, !digitalRead(BUILTIN_LED));
last_blink = millis();
}
break;
}
}
I am trying to send the number "25" from arduino to android application created by using MIT AppInventor2. At the same time, I want to make "on" or "off" a LED by clicking "lock" and "unlock" buttons on the android app. There is no problem making LED status "on" and "off" but I can not read the 25 on the application. I only read 2 or 5. I read 25 very very rarely.
What is the problem about my arduino code or AppInventor blocks?
Arduino code:
int ledPin = 13;
String readString;
void setup() {
Serial.begin(9600);
pinMode(ledPin, OUTPUT);
}
void loop() {
Serial.println(25);// Here I want to send 25
delay(20);
while (Serial.available()) {
delay(3);
char c = Serial.read();
readString += c;
}
if (readString.length() >0) {
// Serial.println(readString);
if (readString == "on")
{
digitalWrite(ledPin, HIGH);
}
if (readString == "off")
{
digitalWrite(ledPin, LOW);
}
readString="";
}
}
Edit: Time interval for AppInventor clock is 1000.
i meet a issue. when i send a text message to my arduino board with a shield sim900 its show my message in number mode. who know what is the problem? here is my code. at the bottom i use serial monitor to see my message and it is read the message in number.
`
#include <SoftwareSerial.h>
SoftwareSerial SIM900(7, 8);
char incoming_char=0;
void setup()
{
Serial.begin(19200); // for serial monitor
SIM900.begin(19200); // for GSM shield
SIM900power(); // turn on shield
delay(25000); // give time to log on to network.
pinMode(4, OUTPUT);
digitalWrite(4, LOW);
SIM900.print("AT+CMGF=1\r"); // set SMS mode to text
delay(1000);
SIM900.print("AT+CNMI=2,2,0,0,0\r");
// blurt out contents of new SMS upon receipt to the GSM shield's serial out
delay(1000);
}
void SIM900power()
// software equivalent of pressing the GSM shield "power" button
{
digitalWrite(9, HIGH);
delay(1000);
digitalWrite(9, LOW);
delay(7000);
}
void loop()
{
// Now we simply display any text that the GSM shield sends out on the serial monitor
if(SIM900.available() >0)
{
incoming_char=SIM900.read(); //Get the character from the cellular serial port.
Serial.print(incoming_char); //Print the incoming character to the terminal.
if (incoming_char=='a')
{
digitalWrite(4,HIGH);
Serial.println(incoming_char);
SIM900.println("AT+CMGD=1,4"); // delete all SMS
}
if (incoming_char=='b')
{
digitalWrite(4,LOW);
Serial.println(incoming_char);
SIM900.println("AT+CMGD=1,4"); // delete all SMS
}
}
}
What I want to do is to control 2 leds in the arduino board with a processing program.
If I press any point on the upper half of the screen the led (Pin 13) will light on, and if I press a point on the lower half of the screen, it will turn on other led (Pin 12).
So, I programmed 2 buttons, with 2 leds(Pin 12 an 13) and no matter what button I press, It always turns on pin 13.
I made a separate experiment, with only 1 button, change only the pin 13 by 12. It does not work, always turns on pin 13.
ARDUINO CODE:
boolean estado;
boolean estado1;
byte a;
void setup()
{
Serial.begin(9600);
pinMode(12, OUTPUT);
digitalWrite(12, LOW);
pinMode (13, OUTPUT);
digitalWrite (13, LOW);
randomSeed(analogRead(0));
estado = false;
estado1 = false;
}
void loop()
{
delay(100);
Serial.write(random(40));
while(Serial.available() > 0)
{
a = Serial.read();
if (a == 0)
{
estado = !estado;
digitalWrite(12, estado);
}
if (a == 1)
{
estado1 = !estado1;
digitalWrite(13, estado1);
}
}
}
PROCESSING CODE:
void compruebaBoton()
{
if( mouseY < 640)
{
try
{
ons.write(0);
}
catch(Exception ex)
{
estado = 4;
error = ex.toString();
println(error);
}
}
if( mouseY > 640)
{
try
{
ons.write(1);
}
catch(Exception ex)
{
estado = 4;
error = ex.toString();
println(error);
}
}
}
the code I am implementing is correct for what I am trying to do?
After playing with the code for hours, I found the problem!!
The program is not loaded into the arduino if the bluetooth board is connected to the arduino board.