Yep - exactly
GolamMostafa:
Practice the following sketches to see the mechanism of extracting decimal number at the receiver side after collecting the data bytes transferred by the sender using .write() methods.UNO-1 (Sender Codes)
#include<SoftwareSerial.h>
SoftwareSerial SUART(2, 3); //SRX/STX pin of UNO
void setup()
{
Serial.begin(9600);
SUART.begin(9600);
}
void loop()
{
SUART.write('<'); //Start Mark of Message
SUART.write(0x31); //sends 1
SUART.write(0x32); //sends 2
SUART.write(0x33); //sends 3
SUART.write(0x34); //send 4
SUART.write('>'); //End Mark of Message
delay(1000);
}
**UNO-2** (Receiver Codes)#include<SoftwareSerial.h>
SoftwareSerial SUART(2, 3); //SRX/STX pin of NANO
byte myData[10];
bool flag1 = false;
int i = 0;
int x1, x2, x;
void setup()
{
Serial.begin(9600);
SUART.begin(9600);
}
void loop()
{
byte n = SUART.available(); //checking if a data byte has arrived
{
if (n != 0)
{
if (flag1 == false) //Start Mark has not arrived
{
byte x = SUART.read();
if (x == '<')
{
flag1 = true; //Start Mark has arrived
}
}
else //Start Mark has already arrived
{
byte y = SUART.read();
// Serial.println(y, HEX);
if (y != '>')
{
myData[i] = y;
i++;
}
else
{
x = extractDecimal(); //extract decimal number for myData array
Serial.println(x, HEX); //shows received decimal number: 1234
flag1 = false;
i = 0; //reset array
}
}
}
}
}
int extractDecimal()
{
x1 = (int)((myData[0] - 0x30)<< 4)| (int)(myData[1] - 0x30); //12
x2 = (int)((myData[2] - 0x30) << 4) | (int)(myData[3] - 0x30); //34
x = (x1 << 8) | x2;
return x;
}
**BTW:** Give a try to re-write the receiver codes using the following method:SUART.readBytesUntil('>', myArray, 10); //what would be the type of myArray -- byte or char?
Hey I have tried it and it didn't work however I have some questions. The SUART(2,3) means I have to connect the TX from the BT module to digital 2 and RX to digital 3 from the arduino uno? Also, should I be able to read the information from one Serial monitor to another? Eg: I send info from Arduino 1 (COM8) by writing on the Serial monitor and read it on Arduino 2 (COM9) in the serial monitor?
are you sure your BT module supports 5V for Rx ?
TEAC:
Hey I have tried it and it didn't work however I have some questions. The SUART(2,3) means I have to connect the TX from the BT module to digital 2 and RX to digital 3 from the arduino uno? Also, should I be able to read the information from one Serial monitor to another? Eg: I send info from Arduino 1 (COM8) by writing on the Serial monitor and read it on Arduino 2 (COM9) in the serial monitor?
The posted sketches have been tested on two UNOs being connected solidly via SUART (Software UART) Ports where the connections are to be made as follows:
DPin-3 of UNO-1 (STX) ----> DPin-2 of UNO-2 (SRX)
DPin-2 of UNO-1 (STX) <---- DPin-3 of UNO-2 (STX)
GND of UNO-1 <------------> GND of UNO-2
If you are using BT, the connections would be as follows:
