Got my grubby mitts on one of these babies, and though I might just as well share the experience. The sensor: The JY MCU — BT_BOARD V1.02 has 4 pins: VCC (worked with +5V0, dunno about +3V3), GND, TX and RX. It will fit in any serial interface (it also works just fine on the AREXX RP6 robot) and usage is very straightforward. Pics go below (clicking zooms them, as always):
The setup:The setup is easily done, just like in the two pics below:
- RED wire goes to the +5V pin
- BLUE wire goes to GND (ran out of black ones
) - GREEN wire goes from the board’s RX to the module’s TX
- YELLOW wire goes from the board’s TX to the module’s RX (exactly the opposite)
Pairing with Windows: Just fire up the board — you’re going to see a red LED blinking on the Bluetooth module. Go to Control Panel, Devices and printers applet, then select the paired device to see the COM port used (right click, click Properties and go to the Hardware tab. You should see the COM port there. 
How to pair:
Just go to Control Panel, devices and printers and pair the device. Open the properties to see the COM port.
Now start up your favorite serial terminal (I use Putty), connect to the COM port, run the sketch and see the result:
The code:
Again, nice, clean and simple:D:
/* Created by Dan D. http://blog.dugheanu.com*/
void setup() { Serial3.begin(9600); //we are going to setup the BT serial baud to 9600 } void loop() { if (Serial3.available() >0){ // check if no incoming data Serial3.write("test");} //output string }
Secured by
Its easy to use putty for this code. Its one feature makes it easy to implement that is that it can fit in any serial interface.
I’m interested in similar project, but I have to make java (j2me) app to control terminal server already installed in digital display device with serial port.
Is it problem to replace serial port with JY-MCU BT_BOARD v1.02 and just pair mobile with it?
@Adeii, as long as you can establish the serial connection and setup the 5V correctly (careful not to burn the module with higher voltage) I don’t see any reason why this could not be done with Java
THIS CODE DOES NOT RUN, WHY???
YOU HAVENT REALLY EXPLAINED MUCH
I GET THE ERROR ‘searial3’ was not declared in this scope
the code basically has 3 lines (excluding the void’s), all of wich are commented — and it should work just fine.
Your comment says “Searial 3″, wich could be a typo, please check.
Hi
I have one question.I have got the same board and it is being detected via my laptop bluetooth as mapped to COM14 but I am unable to connect via putty.I have just powered up the board . Do I need to connect it first with microcontroller serial pins and write serial port code first or it will reply to my AT commands without that ?
Hi Rizwan,
well, if you managed to get it paired succesfully on COM14, chances are you can’t get it working with putty because of the different serial rate settings.
It really does not matter wich BAUDS you use, just make sure that your computer and the Jy-MCU both use the same (9600 is usually my weapon of choice, but almost any of the most commons settings will do. just don’t go over 56K as my bluetooth dongle doesn’t seem to support anything over this setting — I using a dongle that I bought almost 10 years ago for some nokia phone back then
let me know if you encounter any more difficulties, maybe I could help you to get it working
I Have to ask one question, can it be paired with android? If yes, how to pair it with android phone?
Hi Rahul,
I’m quite sure it can. Don’t really know how, however, since I don’t own any Android device.