Hey Guys,
This is my first time posting to the forums. Currently I am working on a project that involves sending data from a BlueTooth Bee Standalone(Master) to an uno with a Bluetooth Shield. Whenever i send a single character i always get the ascii numerical representation. For example when i want to send 1 i would get a 34 on the other side.
If i was only sending single characters i would just subtract 48, but im sending a number with decimals and i get other numbers.
Attached below is my code for both the receiver and the transmitter
Any help would be nice , if i need to provide any information ill be more than willing to do so.
BlueTooth Bee Standalone(Master)
#include <SoftwareSerial.h> // Software Serial Port
#define RxD 2
#define TxD 3
#define DEBUG_ENABLED 1
const int sensorPin = 3; // should be an analog in to read voltage
float newSensorVal;
float sensorVal = 0;
int sensorRate=200;//hz
int btRate=10;
long sensorInterval = 1000000.0/sensorRate;
long btInterval = 1000000.0/btRate;
double filterCoef = .95;
unsigned long prevSensorMicros = 0;
unsigned long prevBtMicros = 0;
unsigned long currentSensorMicros;
unsigned long currentBtMicros;
String retSymb = "+RTINQ="; // start symble when there's any return
String slaveName = ";SeeedBTSlave"; // caution that ';'must be included, and make sure the slave name is right.
int nameIndex = 0;
int addrIndex = 0;
String recvBuf;
String slaveAddr;
int counter = 0;
String connectCmd = "\r\n+CONN=";
SoftwareSerial blueToothSerial(RxD,TxD);
void setup()
{
Serial.begin(9600);
pinMode(RxD, INPUT);
pinMode(TxD, OUTPUT);
setupBlueToothConnection();
//wait 1s and flush the serial buffer
delay(1000);
Serial.flush();
blueToothSerial.flush();
}
//code to send over
void loop()
{
//I commented this out to try and debug my code
/* currentSensorMicros = micros();
currentBtMicros = micros();
if (currentSensorMicros - prevSensorMicros > sensorInterval) {
prevSensorMicros = currentSensorMicros;
newSensorVal = analogRead(sensorPin);
//newSensorVal =newSensorVal*(3.3/1024.0);//what im currently reading
//sensorVal = (filterCoef * sensorVal) + ((1.0 - filterCoef) * newSensorVal);
}
if (currentBtMicros - prevBtMicros > btInterval) {
prevBtMicros = currentBtMicros;
newSensorVal=newSensorVal*(3.3/1024.0);
Serial.println(newSensorVal);
blueToothSerial.print(newSensorVal);
} */
//Reading Voltages through Blue Tooth bee and sending data to shield.
newSensorVal = analogRead(sensorPin);
// newSensorVal = newSensorVal*(3.3/1024.0);
Serial.print(newSensorVal);//multiplying 5/1024 to scale the number to voltage
Serial.print(" * (3.3/1024.0) = ");
sensorVal = newSensorVal*(3.3/1024.0);
Serial.println(sensorVal);
blueToothSerial.print(newSensorVal);
}
void setupBlueToothConnection()
{
blueToothSerial.begin(38400); // Set BluetoothBee BaudRate to default baud rate 38400
blueToothSerial.print("\r\n+STWMOD=1\r\n"); // set the bluetooth work in master mode
blueToothSerial.print("\r\n+STNA=SeeedBTMaster\r\n"); // set the bluetooth name as "SeeedBTMaster"
blueToothSerial.print("\r\n+STAUTO=0\r\n"); // Auto-connection is forbidden here
delay(2000); // This delay is required.
blueToothSerial.flush();
blueToothSerial.print("\r\n+INQ=1\r\n"); //make the master inquire
Serial.println("Master is inquiring!");
delay(2000); // This delay is required.
//find the target slave
char recvChar;
while(1)
{
if(blueToothSerial.available())
{
recvChar = blueToothSerial.read();
recvBuf += recvChar;
nameIndex = recvBuf.indexOf(slaveName); //get the position of slave name
//nameIndex -= 1;
//decrease the ';' in front of the slave name, to get the position of the end of the slave address
if ( nameIndex != -1 )
{
//Serial.print(recvBuf);
addrIndex = (recvBuf.indexOf(retSymb,(nameIndex - retSymb.length()- 18) ) + retSymb.length());//get the start position of slave address
slaveAddr = recvBuf.substring(addrIndex, nameIndex);//get the string of slave address
break;
}
}
}
//form the full connection command
connectCmd += slaveAddr;
connectCmd += "\r\n";
int connectOK = 0;
Serial.print("Connecting to slave:");
Serial.print(slaveAddr);
Serial.println(slaveName);
//connecting the slave till they are connected
do
{
blueToothSerial.print(connectCmd);//send connection command
recvBuf = "";
while(1)
{
if(blueToothSerial.available()){
recvChar = blueToothSerial.read();
recvBuf += recvChar;
if(recvBuf.indexOf("CONNECT:OK") != -1)
{
connectOK = 1;
Serial.println("Connected!");
blueToothSerial.print("Connected!");
break;
}
else if(recvBuf.indexOf("CONNECT:FAIL") != -1)
{
Serial.println("Connect again!");
break;
}
}
}
}while(0 == connectOK);
}Blue Tooth Shield({Reciever/Slave)
#include <SoftwareSerial.h> //Software Serial Port
#define RxD 6
#define TxD 7
#define DEBUG_ENABLED 1
double newRecvChar;
SoftwareSerial blueToothSerial(RxD,TxD);
double recvChar;
void setup()
{
Serial.begin(9600);
pinMode(RxD, INPUT);
pinMode(TxD, OUTPUT);
setupBlueToothConnection();
}
void loop()
{
while(1)
{
if(blueToothSerial.available() )
{//check if there's any data sent from the remote bluetooth shield and print them
//taking in the character
recvChar = blueToothSerial.read();
newRecvChar = recvChar* 3.3/1024.0;
Serial.print(recvChar );//multiplying 5/1024 to scale the number to voltage
Serial.print(" * (3.3/1024.0) = ");
Serial.println(newRecvChar);
}
}
}
void setupBlueToothConnection()
{
blueToothSerial.begin(38400); // Set BluetoothBee BaudRate to default baud rate 38400
blueToothSerial.print("\r\n+STWMOD=0\r\n"); // set the bluetooth work in slave mode
blueToothSerial.print("\r\n+STNA=SeeedBTSlave\r\n"); // set the bluetooth name as "SeeedBTSlave"
blueToothSerial.print("\r\n+STOAUT=1\r\n"); // Permit Paired device to connect me
blueToothSerial.print("\r\n+STAUTO=0\r\n"); // Auto-connection should be forbidden here
delay(2000); // This delay is required.
blueToothSerial.print("\r\n+INQ=1\r\n"); // make the slave bluetooth inquirable
Serial.println("The slave bluetooth is inquirable!");
delay(2000); // This delay is required.
blueToothSerial.flush();
}