Andrew Davie's Arduino Televisor by Chris Lewis

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Andrew Davie's Arduino Televisor by Chris Lewis

Postby acl » Sat Jul 18, 2020 1:47 am

Construction Diary 7 Final Testing

With the disc now fitted on the motor and spun freely by hand we may start final testing. You will need to load all the files from this directory onto a MicroSD card and insert into the socket on the main controller card.

https://github.com/andrew-davie/Arduino ... BTV8%20WAV

These are the actual NBTV video files. Apply power to the unit and hopefully if there’s no smoke you should see the display light up with HMI front screen. By touching the screen the play menu should appear then you can select the NBTV file you would like to play then by touching the icon at the bottom right of the screen the motor should start to turn counter clockwise, speed up and after a short period of time the video should lock. Adding electrolytic capacitors approx. 470 MFD should stabilise the picture (watch the polarity).

If the picture is upside down the motor is turning the wrong way round and can be rectified by swapping the leads on the motor. If the image is ‘mirrored’ indicated by the countdown numbers being reversed then the disc is facing the wrong direction. Touching the icon again stops the run sequence. Brightness, contrast and volume controls are controlled by touch control slider bars.

If the disc tries to launch itself into orbit then we should start looking at the speed detection circuitry. With the power on and the disc not turning if we connect a scope across the ‘two ‘IR-synch in’ terminals (ground connection to the right terminal) we should see a nominal five Volt signal when the synch hole is obscured and zero volts when the hole is present. If you suspect a faulty IR detector then swap the wires around if not point a TV remote control directly into the detector and you should see a stream of pulses appear when a selection button is depressed on the remote control. If you point a digital camera at the IR sending LED you should see a blue hue around through your viewfinder it when it is energised.
acl
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Re: Andrew Davie's Arduino Televisor by Chris Lewis

Postby Andrew Davie » Sat Jul 18, 2020 11:26 pm

acl wrote:These are the actual NBTV video files. Apply power to the unit and hopefully if there’s no smoke you should see the display light up with HMI front screen. By touching the screen the play menu should appear then you can select the NBTV file you would like to play then by touching the icon at the bottom right of the screen the motor should start to turn counter clockwise, speed up and after a short period of time the video should lock.


That doesn't sound quite right. The play menu will show the filenames of the "wav" files detected on the MicroSD card. You should be able to select any of these by pressing anywhere on the line with the name. On the right side is a scrollbar, which behaves as expected if you have more files than can be shown on a single screen. When you select a file, it should auto-play from that point - displaying a control screen with brightness/contrast/sound/gamma and a few other controls.
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Re: Andrew Davie's Arduino Televisor by Chris Lewis

Postby acl » Sat Jul 18, 2020 11:38 pm

I stand corrected Andrew.
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