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If it is in transparent mode, then characters are sent over the air.
Connecting Arduino Uno and the JY-MCU Bluetooth module using SoftwareSerial |
In general, a pull-up resistor on any input is the right starting point, as it puts a pin into a safe, defined, state if it is otherwise not connected. Hi Antonio, the voltage level of the HC Bluetooth modules are really 3. Once connection is established, that red light will stay on constantly. I ended up connecting the bluetooth device to the 3. But these PDD macros are only for enabling pullups: Hi Erich, I am trying to send messages from an android phone to a pc terminal via bluetooth using the HC 05 module connected to the frdm kl25z and I am facing a few problems.
From what I can see is that I can not make the module to get into AT command mode. Please try it first with your PC. And when i enable the software pull up in the RX pin on my microcontroller, nothing different happen.
Hi Stoyan, you only can send AT commands to the module as long it is blinking.
I will check the links and will try it again. I have tried with the KEY pin with 3. It seems that the module gets into some special mode — I have a different LED pattern. Yes, agreed, it is always the combination of hardware and software which makes things challenging. Considering how ubiquitous Bluetooth is most smartphones and laptops have itit will turn out to be extremely useful in our future projects.
In this product manual https: Hi Jan, thanks for sharing. I have noticed that on the AT command modeI can only type in commands when the kl25z rx is disconnected from the HC05 tx. In my example, Rx is on PTC Have you ever observed anything like that? So what is wrong that nothing arrives on the connector bleutooth to the microcontroller? Learn how your comment data is processed.
For example this enables pull-ups for PTC3: But when I power it with the USB cable connecting to a computer, the software TX pin seems to send me some error data.
Changing the baud rate settings to the default setting allowed me to get the characters sent as they were. With inspecting the traces on buletooth board and probing the contacts, and this took me a while….
I was also puzzled why they would add a diode on the TxD pin. I run out of stock as the modules are getting popular and are used in many student projects.
But direct connection will be cheap and simple. I suggest for the Arduino user, a code for the setup like the follow:. You are commenting using your Facebook account. Now when the Key is up 3. On sending characters from the phone, I get back non english symbols on the pc.
It also provides some information on how to change the baud rate, device name and passkey, so make sure to check the data sheet.
Any thoughts on it will be greatly appreciable. So this is, I think, an error somewhere in the analog part of my bluetooh.
Easy Arduino Bluetooth Communication with JY-MCU Bluetooth module
Yes, this issue is not related to 3. I understand that the localfilesystem is not available for the kl25z and thus i need an sd breakout board so as to jy-jcu the text files in sds and use the sdfilesystem library.
Here is the datasheet for the main module: I tried to wire it to 3. Do you have plan to try with Bluetooth Low Enegy 4. With all the comments thanks! I suggest you hook up a logic analyzer or oscilloscope to the RX and TX pins and try different baud rates.
Working Bluetooth Communication between Host and Microcontroller. Oh thank you, I guess you have saved my day last night: Many thanks, Stoyan Like Like. Hi Erich It looks like there is an issue with some 5V systems vluetooth well.
Getting Bluetooth Working with JY-MCU BT_BOARD V | MCU on Eclipse
I would connect the zs with a microcontroller and talk to it to jy-kcu what the signals are. Then the Bluetooth module will pull the signal to logic 0 through the diodes and the pull-up resistor will pull it to logic 1, and all should be well… Like Like.
My modules say that they should be powered 3. Any help is appreciated. For now I use a rs db9 module to connect with the db9 serial port of the modem, and connect the HC to the module.
Failure jy-cmu get response from Module.
I was wondering if after enabling the pull up resistor i had to wire that pin to ground? The wiring is really straightforward, no extra components are needed. The problem is that I can use the module, but I can not change the name or speed of it.