sir may i post my question in this forum?
how can i connect the vb to arduino..
i want to type in textbox and when i hit the enter button from vb.net then i want it to display in LCD from arduino... 
thanks..
Have a look at the code in this Python demo (which is a stick at the top of this section of the Fourm ! ). It illustrates the general principles which apply for any programming language.
As a first (learning) step I suggest you write a VB program to do wnat my Python program does and use my Arduino code to work with it. That way you will know you have working Arduino code.
The Python program should run on Windows if you put in the correct serial port reference.
You may also be interested in serial input basics
...R
Hello,
On the VB you need to create a Serial Port Object. Define its properties to meet the ones you use in Arduino such as your COMPORT and baudrate. You can do this on form load.
Then create a button to initialize the communications and its code will be something like this:
If SerialPort1.isopen then
Serialport1.close
else
SerialPort1.start
msgbox("communications have began")
end if
To send a message to arduino write this within some event:
SerialPort1.write(message+vbcrlf)
note: on the end of your message don't forget to add a vbcrlf (new line) so arduino knows the message he is receiving is complete.
On the arduino side it is a bit more complicated you'll need to define a serialevent like this:
/*
SerialEvent occurs whenever a new data comes in the
hardware serial RX. This routine is run between each
time loop() runs, so using delay inside loop can delay
response. Multiple bytes of data may be available.
*/
void serialEvent() {
while (Serial.available()) {
// get the new byte:
char inChar = (char)Serial.read();
// add it to the inputString:
conteudo += inChar;
// if the incoming character is a newline, set a flag
// so the main loop can do something about it:
if (inChar == '\n') {
stringComplete = true;
}
}
}
This will read the characters that arrive on the serial port and concatenate them to form the message you sent from VB.
Then use the boolean stringComplete to do something on your loop
void loop(){
// print the string when a newline arrives:
if (stringComplete) {
your code
// clear the string:
conteudo = "";
stringComplete = false;
}
Hope that helps you.
paulomarcelinosoares:
On the VB you need to create ...
As you seem to know VB it would be very helpful to others if you could post a complete working example with VB code and corresponding Arduino code.
Feel free to use the Arduino code from my Python demo or from my Python GUI demo if you wish.
I don't have Windows - only Linux.
...R