Doz' Blog: It's (another) Arduino Christmas.

Sunday, 2 December 2018

It's (another) Arduino Christmas.

Here's a super simple persistance-of-vision display.

Drive the neighbours mad with 8 static leds, that when they move their head, or drive past, delivers a festive message!

Ingredients.

1 Arduino board (I used a 3.3V 8MHz mini, but anything will do)
8 LED's (if using a 3.3V board, make sure you have enough voltage to light the LEDs!)
8 current limiting resistors

Connect each LED to pins 0-7 (noting 0 and 1 are RX and TX) via a current limiting resistor, and ground.

Load the code from https://github.com/andydoswell/christmas-POV

and enjoy the festive season!

And here's Stuart W's version!

6 comments:

IanS3 December 2018 at 09:59
Super idea!
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Unknown13 December 2018 at 11:39
Built it. The LEDs are blinking.
How can I correctly move the circuit to read the text.
Me and my pupils were waving like windmills but it was nearly impossible to read the letters...
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Unknown14 December 2018 at 06:48
We built it and LEDs are flashing.
How can we make the letters visible?
Just waving hands doesn't work for me and my students.
Do we need a camera and long time exposure?
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bootwongkrit26 December 2018 at 13:22
Hey Andy,
Thanks for sharing these amazing hacks for Christmas decoration, i missed these amazing tips to decorate using visible LEDs but i will surely use these on new year.
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Many pages on this blog describe working with high voltages, and vintage equipment. Sadly in this day of litigation, and common sense being absent, I must publish a disclaimer.

WARNING. Do NOT try these things at home. Most of the equipment I deal with in these pages uses high voltage, it will floor you or kill you if you come into contact with it. It will not warn you, blow a fuse, nor pull your safety trip. It may not give you a second chance. RESPECT IT'S AUTHORITY.

Many pages describe working with mains, or dealing with mains powered equipment which may have exposed mains connections inside the enclosure. Pull the plug and isolate before removing covers! Some equipment, in particular valve (tube) amplifiers, television sets and switched mode power supplies, can store high voltages for a considerable period of time after the power has been removed, especially if a fault condition exists. Always check and safely discharge capacitors. Safety is paramount.

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I repeatedly get requests, via messaging etc, asking me to fix their kit for them. This is just a hobby for me. I don't take on repairs on a commercial basis. The idea is to give my readers an insight into what's involved, and enable them to fix their own gear, (within the realms of safety of course), and I'll always help if I can. It's really for my own enjoyment and entertainment. It all started out with a simple website to actually document what I was doing, rather than making copious notes on paper, which I'd been doing since the late 80's. It was a friend that suggested I should make it all public, so I did. I never dreamed anyone else would find it interesting, and yet, I get around 200 people visiting everyday, which astounds me even to this day. So, sadly I can't fix your gear for you. Take it to a local firm. There are still a few TV repair places dotted about, a good few repair cafe's operate up and down the country, and see if you can find a tame radio ham who may share some of their knowledge and experience. There are a few "Makerspaces" dotted around the country, and they may be willing to help. I currently work as an engineer in the broadcast industry, and, until that changes, this will just remain a hobby. Thanks. Doz.

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Sunday, 2 December 2018

It's (another) Arduino Christmas.

6 comments:

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