I want to build an Arduino car controller via Bluetooth and smartphone. My problem is that the RC-motors don't work as they should.
//Kann auch ENABLE EN1 und EN2
//L293 statt L293D, weil 1A statt 0,5A und wird weniger heiß, ist aber größer, die 0V in seiner Schematics ist Hitzeableiter
int IN1 = 12;
int IN2 = 13;
int schalter = 4;
int gas = 0;
void setup() {
pinMode(IN1, OUTPUT);
pinMode(IN2, OUTPUT);
}
void loop() {
digitalWrite(IN1, LOW);
digitalWrite(IN2, HIGH);
delay(2000);
digitalWrite(IN2, LOW);
delay(2000);
}
If I connect a battery directly to the motor, it spins. But over the L293D driver nothing works. But when I measure the outputs of the L293D that would be connected to the motor, the output is just fine.
The problem was that i didn't connect the 0V/Ground from the L293 to the Arduino.
Code was fine.
Related
/*
== MASTER CODE ==
*/
#include <SoftwareSerial.h>
SoftwareSerial BTSerial(10, 11); // RX | TX
#define ledPin 9
int state = 0;
int Vry = 0;
int Vrx = 0;
void setup() {
Serial.begin(9600);
pinMode(ledPin, OUTPUT);
digitalWrite(ledPin, LOW);
BTSerial.begin(38400); // HC-05 default speed in AT command more
}
void loop() {
if(BTSerial.available() > 0){ // Checks whether data is comming from the serial port
state = BTSerial.read(); // Reads the data from the serial port
}
// Controlling the LED
/*if (state == '1') {
digitalWrite(ledPin, HIGH); // LED ON
state = 0;
}
else if (state == '0') {
digitalWrite(ledPin, LOW); // LED ON
state = 0;
}
*/
// Reading the potentiometer
//Vry = analogRead(A0);
/*
Vrx = analogRead(A1);
int VrxMapped = map(Vrx, 0, 1023, 0, 255);
//int Vry_mapped = map(Vrx, 0, 1023, 0, 255);
//int Vrx_mapped = map(Vry, 0, 1023, 0, 255);
Serial.print("Vrx");
Serial.println(VrxMapped);
//Serial.print("Vry");
//Serial.println(Vry);
*/
Vrx = analogRead(A1);
BTSerial.write(Vrx);
Serial.print("Vrx: ");
Serial.println(Vrx);
//BTSerial.write(Vry);
delay(2000);
}
and the slave code is as follows,
/*
== SLAVE CODE ==
*/
#include <SoftwareSerial.h>
#define button 8
SoftwareSerial BTSerial(5, 3); // RX | TX
// connect motor controller pins to Arduino digital pins
// motor one
int enA = 10;
int in1 = 9;
int in2 = 8;
int enB = 11;
int in3 = 7;
int in4 = 6;
int jx = A0;
int jy = A1;
int mx = 0; //right motor
int my = 0; //left motor
int state = 0;
int i = 0;
int buttonState = 0;
int ledPin = 13;
void setup() {
pinMode(enA, OUTPUT);
pinMode(in1, OUTPUT);
pinMode(in2, OUTPUT);
pinMode(enB, OUTPUT);
pinMode(in3, OUTPUT);
pinMode(in4, OUTPUT);
BTSerial.begin(38400); // HC-05 default speed
Serial.begin(9600);
pinMode(button, INPUT);
pinMode(ledPin, OUTPUT);
}
void loop() {
//my = analogRead(BTSerial.read());
// mx = analogRead(BTSerial.read());
if(BTSerial.available() > 0){ // Checks whether data is comming from the serial port
int state = BTSerial.read(); // Reads the data from the serial port
//Serial.print('y');
//Serial.println(my+100,DEC);
Serial.print('x');
Serial.println(state);
}
if (i == 2){
i=0;
}
/*int mapx = map(mx,0,1023,0,255);
int mapy = map(my,0,1023,0,255);
if (mapx>127)
{
digitalWrite(in1, LOW);
digitalWrite(in2, HIGH);
analogWrite(enA,mapx);
}
else
{
digitalWrite(in1, HIGH);
digitalWrite(in2, LOW);
analogWrite(enA,127-mapx);
}
if (mapy>127)
{
digitalWrite(in3, HIGH);
digitalWrite(in4, LOW);
analogWrite(enB,mapy);
}
else
{
digitalWrite(in3, LOW);
digitalWrite(in4, HIGH);
analogWrite(enB,127-mapy);
}
delay(1000);
*/
/*Serial.println(state);
if(BTSerial.available() > 0){ // Checks whether data is comming from the serial port
state = BTSerial.read(); // Reads the data from the serial port
}
if (state > 120){
digitalWrite(ledPin, HIGH); // sets the LED on
delay(1000); // waits for a second
digitalWrite(ledPin, LOW); // sets the LED off
delay(1000);
}
else{
digitalWrite(ledPin, HIGH); // sets the LED on
delay(1000); // waits for a second
}
// Controlling the servo motor
// Reading the button
buttonState = digitalRead(button);
if (buttonState == HIGH) {
BTSerial.write('1'); // Sends '1' to the master to turn on LED
}
else {
BTSerial.write('0');
}
*/
delay(2000);
}
The problem here is following,
if I send 1 from master I get 130 at slave end, I have no idea how Serial communication works and how data can be received over bluetooth devices!
The serial of bluetooth in read function returns character.
I'm having trouble communicating between Tera Term and an Arduino Mega over a bluetooth connection. My goal is to be able to set up the Mega so it can be later used to exchange text commands with a C++ application. Using the code I've found on this site, I can use the Arduino IDE Serial Monitor to send text to the Tera Term terminal, but I cannot send text from the Tera Term terminal to the Arduino. It never recognizes text was sent from the terminal. The bluetooth module I am using is the Bluetooth Mate Gold from SparkFun. The code's purpose is to detect incoming chars and then activate an LED. My code is shown below:
#include <SoftwareSerial.h>
int bluetoothTx = 15;
int bluetoothRx = 14;
SoftwareSerial bluetooth(bluetoothTx, bluetoothRx);
void setup() {
pinMode(13, OUTPUT);
//Setup usb serial connection to computer
Serial.begin(9600);
//Setup Bluetooth serial connection to android
bluetooth.begin(115200);
bluetooth.print("$$$");
delay(100);
bluetooth.println("U,9600,N");
bluetooth.begin(9600);
}
void loop() {
//Read from bluetooth and write to usb serial
if(bluetooth.available()) {
char toSend = (char)bluetooth.read();
Serial.print(toSend);
flashLED();
}
//Read from usb serial to bluetooth
if(Serial.available()) {
char toSend = (char)Serial.read();
bluetooth.print(toSend);
flashLED();
}
}
void flashLED() {
digitalWrite(13, HIGH);
delay(500);
digitalWrite(13, LOW);
}
The only thing that seems to work from Tera Term is entering command mode using "$$$." Doing that, I can run commands such as "D." I'm not sure why I can't send chars from Tera Term to the Arduino and have them be read. Any suggestions are appreciated.
I just built the same thing and i had to add a delay of 500 ms before configuring the module. I also had problems with receiving data since i used pin that did not support the PCINT interrupt.
delay(500);
bluetooth.begin(115200);
bluetooth.print("$");
bluetooth.print("$");
bluetooth.print("$");
delay(100);
bluetooth.println("U,9600,N");
bluetooth.begin(9600);
I have a Arduino Uno R3 and a Bluetooth Mate.
When linking the Mate to the Arduino Hardware Serial (pin 0,1) I can send multiple characters at once from my connected device but when I try to make the same thing with Software Serial (using pin 4,2 for example) I only get the first character and the rest of the chars are messed up.
My code:
#include <SoftwareSerial.h>
int bluetoothTx = 4;
int bluetoothRx = 2;
SoftwareSerial bluetooth(bluetoothTx, bluetoothRx);
void setup()
{
Serial.begin(115200);
bluetooth.begin(115200);
}
void loop()
{
if(bluetooth.available())
{
Serial.print((char)bluetooth.read());
}
}
For example if I send this chars: abcd from my android device I get this in the serial monitor: a±,ö
This code that uses Hardware Serial (I link my bluetooth to pins 0 and 1) works just fine:
void setup()
{
Serial.begin(115200);
}
void loop()
{
if(Serial.available())
{
Serial.print((char)Serial.read());
}
}
I even tried changing the baud rate but it didn't helped
If I send the chars one by one it works fine but I would like to be able to send them as a string.
You could try to bufferize the string before printing it.
Look at the following answer: Convert serial.read() into a useable string using Arduino?
As pointed out by #hyperflexed in the comments this is a baudrate related issue.
I had to take the baudrate as low as 9600 to make it work.
This is the code that worked:
#include "SoftwareSerial.h";
int bluetoothTx = 4;
int bluetoothRx = 2;
SoftwareSerial bluetooth(bluetoothTx, bluetoothRx);
void setup()
{
Serial.begin(9600);
delay(500);
bluetooth.begin(115200);
delay(500);
bluetooth.print("$$$");
delay(500);
bluetooth.println("U,9600,N");
delay(500);
bluetooth.begin(9600);
}
void loop()
{
if(bluetooth.available()) {
char toSend = (char)bluetooth.read();
Serial.print(toSend);
}
if(Serial.available()) {
char toSend = (char)Serial.read();
bluetooth.print(toSend);
}
}
For changing the baudrate I had to put some big delays to make sure the commands are executed otherwise it won't work.
I'm a new bie on arduino projects. I would like to ask you for some help. I bought a BLE Shield for Arduino from ( http://imall.iteadstudio.com/development-platform/arduino/shields/im130704001.html ). They made this shield using Hm-10 Bluetooth module(http://www.jnhuamao.cn/bluetooth.asp?ID=1). Itead Studio has no sample codes using this shield. I have no idea on how to program it or send AT commands from Arduino.
I read the “AT commands” at the data sheet (ftp://imall.iteadstudio.com/Shield/IM130704001_ITEAD_BLE_Shield/DS_IM130704001_ITEAD_BLE_Shield.pdf) and I tried to send "AT commands” from arduino to BLE shield using this code ( http://arduino.cc/en/Reference/SoftwareSerial ) but I only received the commands back.
Did anybody here ever use this HM-10 bluetooth module ?
I need some arduino sketch for help !
#include <SoftwareSerial.h>
int led = 13;
int bluetoothTx = 2;
int bluetoothRx = 3;
SoftwareSerial bluetooth(bluetoothTx, bluetoothRx);
int baudrate[8] ={4800,9600,14400,19200,28800,38400,57600,115200};
int i = 1;
void setup() {
Serial.begin(9600);
bluetooth.begin(9600);
while(!Serial){}
Serial.write("AT sent");
delay(500);
bluetooth.write("AT+NAME?");
delay(500);
while (bluetooth.available()) {
Serial.write(bluetooth.read());
}
delay(100);
Serial.println("");
bluetooth.write("AT+POWE3");
delay(500);
while(bluetooth.available())
{
Serial.write(bluetooth.read());
}
delay(100);
Serial.println("");
delay(500);
bluetooth.write("AT+CHAR?");
delay(500);
while (bluetooth.available()) {
Serial.write(bluetooth.read());
}
delay(100);
Serial.println("");
delay(500);
bluetooth.write("AT+NAMEFlightline"); //Check Status
delay(500);
while (bluetooth.available()) {
Serial.write((char)bluetooth.read());
}
Serial.println("");
bluetooth.write("AT+CHAR0x2901"); //add charicteristic
delay(500);
while (bluetooth.available()) {
Serial.write(bluetooth.read());
}
Serial.println("");
bluetooth.write("AT+RELI0");
delay(500);
while (bluetooth.available()) {
Serial.write(bluetooth.read());
}
Serial.println("");
bluetooth.write("AT+SHOW1");
delay(100);
while (bluetooth.available()) {
Serial.write(bluetooth.read());
}
Serial.println("");
pinMode(led,OUTPUT);
digitalWrite(led,HIGH);
}
void testAllBaudRates(){
for(int j=0; j<8; j++)
{
bluetooth.begin(baudrate[j]);
delay(100);
Serial.println("boud rate " + String(baudrate[j],DEC) +" i-> "+String(j,DEC));
// Serial.println("");
bluetooth.write("AT");
delay(500);
while (bluetooth.available()) {
Serial.write(bluetooth.read());
Serial.println();
}
delay(100);
}
}
// and now a few blinks of the LED,
// so that we know the program is running
void loop()
{
//Read from bluetooth and write to usb serial
while(bluetooth.available())
{
char toSend = (char)bluetooth.read();
if(toSend == 'x'){
digitalWrite(led,HIGH);
Serial.println("set high");
bluetooth.write("RXOK");
}else if(toSend == 'y'){
digitalWrite(led,LOW);
Serial.println("set low");
bluetooth.write("RXOK");
}
Serial.print(toSend);
}
//Read from usb serial to bluetooth
while(Serial.available())
{
char toSend = (char)Serial.read();
bluetooth.write(toSend);
Serial.print(toSend);
}
}
Have a look at my sketch above I have a few things to point out that I wasted time on.
make sure you have the line
while(!Serial){}
Or you may get have a working shield but miss the responses as the serial monitor is no ready.
remember that you wont get a response from the blue-tooth module, with a command from the Serial Monitor if it is connected to a device. It is connected to the device when the light stops flashing.
if you run this sketch you should get this output
AT sent
OK+Set:3
OK+Get:0x2901 <- this may be blank the first time you run it
OK+Set:Flightline
OK+Set:0x2901
OK+Set:0
OK+Set:1
the most comprehensive list of AT commands can be found here
[All the AT commands and a good explanation][1]
You will need to at Characteristics to the device as I have done here
bluetooth.write("AT+CHAR?");
or you will find it to connect to iOS and Android
If you are connecting to Android use the BluetoothLE Classes not Bluetooth ones.
You can use this sketch with baud rate autodetect to control your HM-10. This is a part of Apploader project that allows to upload to Arduino board over BLE.
This is a little late too, but try the following code, if you send it "AT" it should give you back an "OK":
#include <SoftwareSerial.h>
int bluetoothTx = 2; // TX-O pin of bluetooth mate, Arduino D2
int bluetoothRx = 3; // RX-I pin of bluetooth mate, Arduino D3
SoftwareSerial bluetooth(bluetoothTx, bluetoothRx);
void setup()
{
Serial.begin(9600); // Begin the serial monitor at 9600bps
bluetooth.begin(115200); // The Bluetooth Mate defaults to 115200bps
delay(100); // Short delay, wait for the Mate to send back CMD
bluetooth.println("U,9600,N"); // Temporarily Change the baudrate to 9600, no parity
// 115200 can be too fast at times for NewSoftSerial to relay the data reliably
bluetooth.begin(9600); // Start bluetooth serial at 9600
}
void loop()
{
if(bluetooth.available()) // If the bluetooth sent any characters
{
// Send any characters the bluetooth prints to the serial monitor
Serial.print((char)bluetooth.read());
}
if(Serial.available()) // If stuff was typed in the serial monitor
{
// Send any characters the Serial monitor prints to the bluetooth
bluetooth.print((char)Serial.read());
}
// and loop forever and ever!
}
Its my first time to use gsm shield to my arduino so I'm kinda confused so i need directions. My aim is to read the message sent to my gsm shield then compare that message into a specific string. if they are the same, arduino will do something. Example is, the GSM shield received a text message containing STATUS, the arduino will do something. The problem I'm stuck up with now is how to read the incoming characters from the gsm module into a single string then compare that string into a specific word. I have this code as of now.
#include <SoftwareSerial.h>
#include <String.h>
char inchar[255];
SoftwareSerial cell(2,3);
int led1 = 22;
#define powerOn 4
int i;
//char comparestring[160];
char command[]={'S','T','A','T','U','S','\0'}; // this is a string for command ended with null terminator
void setup()
{
// ilagay sa loob ng setup
digitalWrite(powerOn, HIGH);
delay(1500);
digitalWrite(powerOn, LOW);
delay(5000);
pinMode(led1, OUTPUT);
digitalWrite(led1, LOW);
Serial.begin(9600);
cell.b-egin(9600);
delay(30000);
cell.println("AT+CMGF=1"); // set SMS mode to text
delay(200);
cell.println("AT+CNMI=1,2,0,0,0 "); // set module to send SMS data to serial out upon receipt
delay(200);
Serial.println("GSM SHIELD IS NOW OK AND READY");
}
void loop()
{
while(cell.available() >0)
{
inchar[i]=cell.read();
i++;
inchar[i] = '\0';
Serial.print(inchar);
if (inchar==command)
{
digitalWrite(led1, HIGH);
cell.write("AT+CMGS=\"");
cell.write("09267955775");
cell.write("\"\r");
delay(1000);
cell.write("\nTerminal Monitoring System");
delay(1000);
cell.write(0x1A); // End the SMS with a control-z
}
else
{
Serial.println("\nInvalid Keyword! Type ?");
dig-italWrite(led1, LOW);
}
}
}
these codes are the codes that supposed to do the trick but i think its not working. I hope you can teach me the right way. Thank you!
while(cell.available() >0)
{
inchar[i]=cell.read();
i++;
inchar[i] = '\0';
Serial.print(inchar);
if (inchar==command)
inchar is a string so try using strcmp(inchar,command) for comparing the two.