My JLink is connected to a hub which I connect my laptop. I am often connecting/disconnecting and each time the JLink beeps. This notification is not useful for me.
How do I disable the sound on my JLink?
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1.I started with esp. 32 i used arduino IDE it only showed COM1 in PORTS. when i was uploading the code i pressed the boot button when connecting..... appears in the window but still an error (timeout....) occurs and code doesn't upload.
i installed the drivers but whenever i plugged in the usb cable a notification pops up that the computer doesn't recognize the device. i installed ch341 but it says the the drivers are preinstalled.
same problem appear with esp8266 node mcu.
Then using the same cable I started working with esp8266 no error popped up it had two options in PORT COM1 and COM4 I choose COM4 and I uploaded the blink code. it worked fine but after that i upload the WIFI SCAN code it started showing same problem as esp32... i disconnected it and connected again error popped up that it doesn't recognized by computer. and furthermore now it only shows com1 in ports option and when I press flash button the code doesn't get uploaded it shows timed out error. i disconnected and connected many times but it doesn't working.
are you setting like this??
this is my setting on the arduino
I mean you can try to install the esp32 USB port library CP210x_Universal_Windows_Driver.exe.
if your system does not detect esp8266 or NodeMCU boards while you installed all possible drivers, as mentioned in this GitHub issue change your USB wire cause the wire maybe is for just charging and not transferring data!
changing it worked for me!
I am working with BLE devices. and using nrf controller with bluez 5.4 code.
I am customizing gatttool source code so that multiple devices can connect and disconnect.
My focus part for now is how to disconnect ble device using gatttool apis.
I had found one solution in code that we can use:
g_io_channel_shutdown();
g_io_channel_unref();
These 2 APIs are use to disconnect ble device.
I am using nrf connect application in my mobile to connect generate dummy ble device so that I can perform operations.
When I use this for disconnecting device any other formalities are needed in between or only these APIs are ok?
I am not able to disconnect using these APIs.Some time it is give effect and some time it is not working.
If any one have idea abut this please respond.
Thanks in advance.
Do you mean Bluez 5.4 or Bluez 5.40? Either way, they are quite old releases.
gatttool is one of the BlueZ tools that has been deprecated in BlueZ.
Ideally you would be using the BlueZ DBus API to interact with BlueZ.
Not sure if you are creating a GATT Server (peripheral device) or GATT client (Central Device) but there are examples of both in the BlueZ source:
https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/test/example-gatt-server
https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/test/example-gatt-client
These examples are in Python, but most languages have DBus libraries to help access the API which are documented at:
https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/doc/adapter-api.txt
https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/doc/device-api.txt
https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/doc/gatt-api.txt
we are doing a project on image processing using a camera,raspberry pi3 and a gsm module. Above mentioned things are with a flying drone. I can send a notification message to a mobile using gsm module if required object detected on the cam. But we store that image to view on a webpage or through a mobile app easily. while it's flying it can't connect to the internet. So can you suggest a solution to get those images when it is inside our home wifi range.(any how we can get the images from sd card but i need to get those as soon as possible it detected the wifi) . Thanks in advance
You could consider using "tethering", a.k.a. "Personal Hotspot" in Apple parlance, on your mobile phone.
Basically, you would enable the Personal Hotspot on your iPhone and allow your RPi to connect to it via Wifi. You would have to check your setup, but my iPhone takes IP address 172.20.10.1 for itself and dishes out IP addresses to clients which are the same but with the 1 replaced by a small number under 13.
You can see from here how to setup your RPi to automagically connect to your Hotspot whenever in range. You could also consider fixing a static IP address when on that network, so you know where the RPi will show up for sure.
You would then ensure that Apache, or maybe lighttpd which is lighter weight, is running on your RPi.
Then, your app on the RPi would store its image as image.jpg in Apache's DOCUMENT_ROOT directory, probably /var/www/html/image.jpg but check.
Now, on the iPhone, start Safari and browse to:
http://172.20.10.N/image.jpg
where N is a small number. You should see your image and be able to save it to DropBox or Photos or iCloud Drive for others to see.
Of course, once your RPi is connected to your iPhone's hotspot, it can FTP or ssh copy the image to any website or other server on the Internet it has access to itself.
I have understood your question also I have cheapest solution to build your project. you will be needing 3 modules
ESP8266 (Wifi module)
SD card logger
Camera module(go with your choice, try ESP8266(But I have not tried it))
Combining all these can get your work done. But most instructing part is When connected with wifi it should transmit video to webpage or app and when not connected should log video to SD card
Below is my try to solve your problem, if you have any doubts feel free to ask your question.
ESP8266 is an WiFi module, you can connect it with an hot-spot or an router, similar to any WiFi device's on successful connection it throws 200,OK failing will throw 404 or so. Technically just like any TCP devices it will work. You can connect, disconnect, send and receive data continuously using software(using code you write).
0-code for camera unit starts
1-try connecting WiFi && start the camera and start logging into SD card //InCase if WiFi module takes longer time than usual to connect, this will prevent data from losing
2-if connection failed - continue writing to SD card
3-else(connection made) - start streaming the data && stop the SD card logging and save the file and create a new empty file so that we can save on next connection out without wasting data.
4-check for connection status in regular interval (goto step2).
5-on any external inputs(like click an image)
most important thing: code for your camera interface should work independent from the flight controller code.
-NandhaFrost
I need to create a Qt GUI that enables the user to select an option from a comboBox and on pressing a 'send' button, send some data to a STM32f072-Disco board via Serial Communication ( over a COM Port - COM11). I looked at the Qt blockig master, blocking slva eexamples but don't understand them very clearly. Any suggestions on how I can proceed ?
I've managed to make a Qt application with some help from sources on github.. The application is able to send & read data from the stm32 board. The stm32 dev board is configured as a CDC device.
The library provided # https://brosnanyuen.blogspot.in/2016/06/stm32-usb-cdc-vcp.html is useful for CDC communication as the stm32 middleware is slightly complex to use.
The git repor # https://github.com/WalkingFrog/Qt-SerialPort-Programming-Demo is a good start for beginners looking for a start.
I can share my code on any requets.
I build Asterisk system, and running Linphone app on iOS and Android system.
I find some issue on my solution. Only used voice service.
Running WiFi environment voice no any delay, When I accept ringing then immediately hear voice.
But running 3G environment voice had 3~5 seconds delay, and fix Jitter buffer configure on Asterisk, enable it, still not solve this issue.
At same device and environment, used Line and Wechat app, when press answer call still have voice delay. but more fast than my system.
Codec used min data packet GSM. Enable QoS.
I know maybe the biggest issue is client 3G network quality. and I still find flexible configure, can fix this.
I want running 3G environment on asterisk system, get best no delay experience.
How can I do fix this issue?
3G network have internal delay.
You can do nothing here.
But usualy it 0.5-1.
Your 3sec delay can be caused by bad 3g connection or overload on 3G or issues with your provider(or you just use 3G connection twice- in and out)