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by PiGraham
Thu Apr 26, 2018 5:12 pm
Forum: Beginners
Topic: Ipad to TV through RPi (Ipad-wifi-Rpi-HDMI-TV)
Replies: 17
Views: 305

Re: Ipad to TV through RPi (Ipad-wifi-Rpi-HDMI-TV)

Raspomain wrote:
Thu Apr 26, 2018 3:59 pm
I posted a message in the Kodi forum.
Airplay doesn't work anymore with Kodi for Apple introduced DRM to the video stream ...
I hate this firm. So it appears the only way is to buy an Apple TV (or use the HDMI adapter) ...
Ah, sorry to hear that. I only knew there was an option in there.
by PiGraham
Thu Apr 26, 2018 12:34 pm
Forum: C/C++
Topic: Cross Compile and remote debug
Replies: 5
Views: 491

Re: Cross Compile and remote debug

Development on the target is definitely viable.
I use VisualGDB for one Pi project. It's a plugin for Visual Studio and gives you the usual intellisense and debug environment. It configures a cross platform build toolchain. Fairly easy and effective.
by PiGraham
Thu Apr 26, 2018 10:07 am
Forum: Beginners
Topic: Ipad to TV through RPi (Ipad-wifi-Rpi-HDMI-TV)
Replies: 17
Views: 305

Re: Ipad to TV through RPi (Ipad-wifi-Rpi-HDMI-TV)

Thank you. I am using a bluetooth keyboard :) Now my iPad can see Kodi. But I still don't know how to stream the iPad display. Did you follow the video ? Have you used Airplay before? I don't know Apple so I can't help you more on that. Basically enable Airplay on Kodi and connect your Apple device...
by PiGraham
Thu Apr 26, 2018 9:14 am
Forum: Beginners
Topic: Ipad to TV through RPi (Ipad-wifi-Rpi-HDMI-TV)
Replies: 17
Views: 305

Re: Ipad to TV through RPi (Ipad-wifi-Rpi-HDMI-TV)

Kodi displays on HDMI (primary display, HDMI, DSI, composite, not VNC), which is what you said you wanted to do.

You can control Kodi using remote apps or web interface
e.g. https://itunes.apple.com/gb/app/officia ... 80364?mt=8
by PiGraham
Thu Apr 26, 2018 8:14 am
Forum: Other projects
Topic: Connecting multiple cameras to one raspi?
Replies: 6
Views: 307

Re: Connecting multiple cameras to one raspi?

If you really need it simultaneous you might be able to combine more than one view into one camera. This site describes ways to do that with two views: https://www.lockhaven.edu/~dsimanek/3d/stereo/3dgallery16.htm It gets even more complicated with more than two. You can use two USB webcams almost s...
by PiGraham
Thu Apr 26, 2018 7:13 am
Forum: Beginners
Topic: Ipad to TV through RPi (Ipad-wifi-Rpi-HDMI-TV)
Replies: 17
Views: 305

Re: Ipad to TV through RPi (Ipad-wifi-Rpi-HDMI-TV)

What is your system? I ran Kodi on a Pi3B+ with Ethernet connection to Internet and HDMI display running Raspbian Stretch recently and it just worked. Running Kodi from the desktop start menu under Sound and video started Kodi which took over full screen display on HDMI. It also works by typing kodi...
by PiGraham
Thu Apr 26, 2018 6:53 am
Forum: General programming discussion
Topic: Making robot follow gps
Replies: 7
Views: 406

Re: Making robot follow gps

If your ROV could tow a buoy you could put the GPS receiver in the buoy and have a positional fix all the time. This could also allow you to stay in radio contact and make recovery much easier if something goes wrong. Guidance underwater is probably difficult since fixed references may not be availa...
by PiGraham
Thu Apr 26, 2018 6:38 am
Forum: Advanced users
Topic: Mean of 60 temperature sensors
Replies: 17
Views: 685

Re: Mean of 60 temperature sensors

Exactly. How many sensors can be accommodated in one Pi? Or is there any multiplexing technique for this? That depends on the interface and that depends on such things as distance between sensors and Pi, availability of power, accessibility to sensor locations etc. You haven't given us much to go o...
by PiGraham
Wed Apr 25, 2018 4:29 pm
Forum: Beginners
Topic: Ipad to TV through RPi (Ipad-wifi-Rpi-HDMI-TV)
Replies: 17
Views: 305

Re: Ipad to TV through RPi (Ipad-wifi-Rpi-HDMI-TV)

I think you can do that with Kodi.

Here's a guide:
https://www.youtube.com/watch?v=Q0WUHG3RSII


You can install Kodi in Raspbian

Code: Select all

sudo apt-get install kodi
Or you can run a media centre distribution like openELEC or RaspBMC
by PiGraham
Wed Apr 25, 2018 1:00 pm
Forum: General programming discussion
Topic: Making robot follow gps
Replies: 7
Views: 406

Re: Making robot follow gps

You might get aswers to specific issues for underwater ROVs at https://www.openrov.com/
by PiGraham
Wed Apr 25, 2018 7:29 am
Forum: Advanced users
Topic: Mean of 60 temperature sensors
Replies: 17
Views: 685

Re: Mean of 60 temperature sensors

Hi All, I want to maintain the temperature of three levels of my building (company), and they are quite large in area. I have planned to mount temperature sensors with some distance at different spots on my ceilings, making a total of around 50-60 sensors on each level. I plan to gather the tempera...
by PiGraham
Wed Apr 25, 2018 7:23 am
Forum: General discussion
Topic: Controlling three solenoid valves with 12 mA limit
Replies: 21
Views: 633

Re: Controlling three solenoid valves with 12 mA limit

A voltage drop of 2.5V is specified that implies that the output voltage is within 2.5V of the supply rails. SO if you power the sensor with 12V the output would go to between (12-2.5) and 12V I'd use an opto-isolator with LED and series resistor as the load driven by the sensor and the phototransis...
by PiGraham
Tue Apr 24, 2018 8:55 am
Forum: General discussion
Topic: Controlling three solenoid valves with 12 mA limit
Replies: 21
Views: 633

Re: Controlling three solenoid valves with 12 mA limit

The question about the proximity sensor...they say the output is PNP but they don't say which of the transistor terminals (Collector or Emitter) is brought out so you don't know if it wants to go to ground through a resistor or to V+ through a resistor. At least I can't see which...maybe I am missi...
by PiGraham
Tue Apr 24, 2018 7:18 am
Forum: Camera board
Topic: Why does the IR flood light cover make the image less blurry?
Replies: 2
Views: 152

Re: Why does the IR flood light cover make the image less blurry?

I can't think of a reason why removing a cover round a light should affect focus of a fixed-focus lens camera. OTOH light from the LEDs that hits the lens could reduce contrast which might be interpreted as 'blurry' or 'foggy'. You could try making a little lens hood from tinfoil to keep any stray l...
by PiGraham
Mon Apr 23, 2018 3:48 pm
Forum: Gaming
Topic: Running Half-Life on Raspberry Pi?
Replies: 5
Views: 477

Re: Running Half-Life on Raspberry Pi?

rpiMike wrote:
Mon Apr 23, 2018 3:20 pm
Looks like it is possible with Exagear:

https://www.youtube.com/watch?v=A2_ZEo9N_fM
That would not be an enjoyable gaming experience.
by PiGraham
Mon Apr 23, 2018 2:47 pm
Forum: Troubleshooting
Topic: PiCamera preview in high resolution
Replies: 5
Views: 189

Re: PiCamera preview in high resolution

AH, I may have missed the key info there. You can run full HD OK in all configurations except when raspi2raspi is running? If raspi2raspi is using GPU to scale the image, as seems likely, then there is a heavy load on the GPU to support full display and camera and mirror to 7". Maybe you are running...
by PiGraham
Mon Apr 23, 2018 12:44 pm
Forum: Graphics, sound and multimedia
Topic: A "simple" instrument
Replies: 12
Views: 380

Re: A "simple" instrument

There seems to be a bit of conflict between "simple" and the level of control you want. How about http://zynthian.org/ with Dexed FM synth plugin? It looks like you can add as much complexity and control as you like. Well, I thought it was simple. I basically only want to be able to play a sine wav...
by PiGraham
Mon Apr 23, 2018 12:26 pm
Forum: Troubleshooting
Topic: PiCamera preview in high resolution
Replies: 5
Views: 189

Re: PiCamera preview in high resolution

I use raspi2raspi from Andrew to mirror the screen from the 7" primary screen to the HDMI. It works well. Shouldn't you be mirroring the HDMI to the TFT? Then the HD preview will naturally be HD and the small display will get a scaled-down copy. Going the other way surely scales-up a low res image ...
by PiGraham
Mon Apr 23, 2018 8:34 am
Forum: Graphics, sound and multimedia
Topic: A "simple" instrument
Replies: 12
Views: 380

Re: A "simple" instrument

kirre wrote:
Sun Apr 22, 2018 9:36 pm
Next thing is, i want to have five knobs on the box that I'll build that control Attack, Release, Time and Feedback (on the delay), and a volume knob.

Is that a reverb? You want to control it per note?
by PiGraham
Mon Apr 23, 2018 8:30 am
Forum: Graphics, sound and multimedia
Topic: A "simple" instrument
Replies: 12
Views: 380

Re: A "simple" instrument

There seems to be a bit of conflict between "simple" and the level of control you want.
How about

http://zynthian.org/ with Dexed FM synth plugin?

It looks like you can add as much complexity and control as you like.
by PiGraham
Fri Apr 20, 2018 9:16 pm
Forum: General discussion
Topic: IoT based Attendance Recording System
Replies: 22
Views: 608

Re: IoT based Attendance Recording System

Has anyone got experience of a system that worked well? I would say most systems work well but it depends on what one is intending to achieve, how one defines 'well', and how much abuse will be tolerated. Good point. I guess the objective is to improve on the fingerprint system and minimise error a...
by PiGraham
Fri Apr 20, 2018 4:28 pm
Forum: General discussion
Topic: IoT based Attendance Recording System
Replies: 22
Views: 608

Re: IoT based Attendance Recording System

It has to be iris scanners as shown in Minority Report.

Well, that or the spiders!
by PiGraham
Fri Apr 20, 2018 3:56 pm
Forum: General discussion
Topic: IoT based Attendance Recording System
Replies: 22
Views: 608

Re: IoT based Attendance Recording System

What I never really get is why we need an in and an out RFID sensor (or in your case or in/out for finger prints). If you swipe and the time has been long enough, you are then not what you where before ? Otherwise why swipe. Thing is students could turn up at the door twice a day just to swipe the ...

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