I search a very simple way to display a Web page (with a photos slideshow) on my TV on a new channel (let's say channel 0).
Is is possible to program a PCMCIA to do that ? With a wifi or RJ45 connection.
Related
I am new to BLE and I need help with Battery Service notifications. I am using nrf52840dk, nrf sdk 17.1.0 and I am using ble_app_proximity example which already uses Battery Service.
I need to send a pop up notification from device to nRF Connect mobile app when battery level reaches 40%. Whenever battery level reaches 40%, a notification should pop up in nRF Connect app telling us that battery level has reached 40% and please charge.
Can anyone please help me with this?
I have tested the ble_app_proximity code and it is showing battery level only when I Read it, but I need it to display a pop up notification on nRF Connect app when battery level reaches 40%.
Thanks,
Kanthi Deep.
There are two steps required in order to achieve what you want:-
Enable the notifications from the nRF Connect app (GATT client).
Send the notification from the nRF52840dk (GATT server).
Let's go through each one in details:-
Enable notifications from the nRF Connect app
Given that your phone is the GATT client, it needs to subscribe to the battery characteristic notifications. This way, when the nRF52840dk sends out a new battery notification, the nRF Connect app will receive it. In order to do this, connect to the devkit using the nRF Connect app, browse through the services and click on the Battery Service to reveal the characteristics. When you do that, you will see the battery level characteristic with a downward (read), upward (I'm not sure if this exists but maybe it doesn't) and multiple downward (enable notification) arrows. The downward arrow is for reading the battery value, the upward arrow (if it exists) is for writing to the battery value, and the multiple downward arrows are for subscribing to notifications. In your case, you want to click on the multiple downward arrows. I have attached a picture below of what the arrows should look like:-
Please note that in your case, this should be the battery value characteristic and not an unknown characteristic.
Send the notification from the nRF52840dk (GATT server)
In your code, you should be continuously monitoring the value of your battery to check if it has reached 40%. If you're using the SDK's libraries, you can have a look at this function that specifically does what you need in that it sends the battery value as a notification when you call it. There are a few posts on Nordic DevZone on how to read the battery voltage, and these are a few examples (link1 and link2).
I am trying to find informations about IBeacons, plus bluetooth Dash Buttons and google delivers contradictory results.
Is there a IBeacon's with an button to click. And an interface on the connected device to react on the click event?
I need if possible to have the proximity and click event.
Is this even possible with IBeacons/BLE specifications?
All kind of informations are welcome.
Thanks
IoT buttons like Amazon Dash and Bluetooth LE beacons like iBeacon have fundamental differences:
Amazon Dash connects to the internet over WiFi to make a web service call on button press, and requires configuration with your WiFi network. Other IoT buttons work similarly, although some connect to the internet via a nearby mobile device using Bluetooth. You must write some code and deploy it to a cloud server to do something whenever somebody taps the button.
Bluetooth LE beacons like iBeacon are transmit only Bluetooth LE devices that do not connect to the internet, but simply sent out a bluetooth packet with a unique identifier. These devices are much simpler, and rely on another bluetooth-enabled computer within 40 meters to be listening (typically a mobile phone). You must write an app on the mobile phone then does something when it detects the beacon transmission is detected.
Most Bluetooth LE beacons are always transmitting, although it is possible to buy ones that are click-on click-off like the RadBeacon Dot. This could provide similar functionality to a Amazon Dash if a mobile app is running nearby that can forward the detection to a similar cloud sever as used for an Amazon Dash solution.
I'm streaming raspberry pi's pi camera over pi's local ip address with specific port. (eg: 192.168.1.111:8000/stream.mjpeg)
I can see the stream over xamarin.forms webview but I want to display it on Xamarin.Forms app with local media players for both iOs and android. Thus I can add control buttons for camera under the videoview. since it is live streaming I dont need forwards or backwards button functionallity.
I definitely lookup at least 5 pages per google search for all the keywords I have but there is nothing I find useful.
Any clues, starting points are appreciated too.
I write an QT application on my laptop (Debian 8). I want to be notified if there is a new call on my phone available (Android).
Is it possible to just notify the laptop without being the laptop a headset?
I already managed to get a connection to the HFP, and my laptop gets a 'RING' signal, but when i want to answer the call, my mobile phone shows a bluetooth speaker /headset connected (in call display) and everything what is spoken is lost on both mobile phones.
So it would be great to just notify about a new call.
Thank you!
I assume you want to keep the audio stay at mobile phone side; is there SCO/eSCO connect/disconnect API's on your laptop? if yes, just reject the audio connect request, or disconnect/switch the audio if it connected.
There are may no audio handler on your PC yet so you could not found the audio.
As i know host application for Sony products are responsable for communication between phone and accessory.
But, in bluetooth data transfer from phone to watch what is specially transferred?
For examle, My Extension data as a object array and layout which will be displayed passed to watch? Or all rendered 176x220px UI block is send from phone to watch.
In this transfer is there any security issues to be considered?
Thanks.
Everything is passed to the watch from the host application, so it would be the complete 176x220 bitmap.
As far as security, Bluetooth data is encrypted in BT v2.1+ plus the user still has to pair the device and confirm a pairing code as with all BT devices. So it's not any less secure than any other Bluetooth device on the market in that respect.