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by g4bch
Tue Dec 19, 2017 1:22 pm
Forum: Graphics, sound and multimedia
Topic: GIANT UPDATE: Build FFmpeg and mpv – Automatically in 54 Minutes!
Replies: 222
Views: 102584

Re: TUTORIAL: Play or Encode High-Quality Video and Audio – with FFmpeg and mpv

Thank you for the detailed ‘How To’. As far as my limited testing has gone so far mpv seems to be working. And I not yet found anything to have been broken. For anyone having got this far past the font size stuffand contemplating trying this, I did have problems with compiling ffmpeg. Despite having...
by g4bch
Thu Sep 10, 2015 12:12 pm
Forum: Other projects
Topic: Wildlife Cam : IR LED Ring Sensor connection
Replies: 9
Views: 3115

Re: Wildlife Cam : IR LED Ring Sensor connection

Hi Greg Great to hear that you have got it working OK. Now for the intersting part seeing what you can spot using your garden at night. I have in the past made some overnight videos using an IR illuminator B/W camera and motion sensitve recording software. I did it mainly to find out what was diggin...
by g4bch
Tue Sep 01, 2015 12:33 pm
Forum: Other projects
Topic: Wildlife Cam : IR LED Ring Sensor connection
Replies: 9
Views: 3115

Re: Wildlife Cam : IR LED Ring Sensor connection

Hi Greg Now it is time to do a little debugging. First measure the voltage at the collector of the BC547 ( RP GPIO pin 18) with the IR illumnator in the light it should be about 3V and in the dark close to 0V. This will determine if the problem is in the hardware you have built or in the software. I...
by g4bch
Fri Jul 17, 2015 9:50 am
Forum: Other projects
Topic: Wildlife Cam : IR LED Ring Sensor connection
Replies: 9
Views: 3115

Re: Wildlife Cam : IR LED Ring Sensor connection

Connect it to 0V ground, the +0.8V goes to the base of the transistor to turn it on and the negative end goes to the emitter. Make sure that the neagative end is connected to 0V on the board. i.e it is designed that way, with a +0.8V signal relative to 0V to indicate the ambient light level. I tried...
by g4bch
Thu Jul 16, 2015 12:38 pm
Forum: Other projects
Topic: Wildlife Cam : IR LED Ring Sensor connection
Replies: 9
Views: 3115

Re: Wildlife Cam : IR LED Ring Sensor connection

You will need a transistor to amplify the 0.8V change on the IR illuminator so that it can be detected by the RPi input. It may be possible to connect the transistor drectly to the IR connection, but to be on the safe side it would be better to limit the base current to a safe value with a resistor....
by g4bch
Wed Apr 17, 2013 12:50 pm
Forum: Graphics, sound and multimedia
Topic: Bat detector
Replies: 28
Views: 28008

Re: Bat detector

I've had a digital bat detector project in the planning and very slow build stage as time permits for some time now, but it is being overtaken by technology. The idea is / was to use a PIC32 for AD conversion, processing and storing the data for later analysis. My earlier efforts with heterodyne det...
by g4bch
Mon Feb 25, 2013 1:17 pm
Forum: Automation, sensing and robotics
Topic: Circuit Design Software
Replies: 9
Views: 3716

Re: Circuit Design Software

For a simulator on the RPi this topic on the ngspice simulator may be of use http://www.raspberrypi.org/phpBB3/viewtopic.php?f=37&t=12895&p=138026&hilit=circuit+simulator#p138026 You could also try QUCS http://qucs.sourceforge.net/ . Quite a powerful simulator, iIt is based on Qt so may take a bit e...

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