onlinegill
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Projection Clock

Thu Feb 11, 2021 5:04 am

Hi,

I am looking a way to make projector time clock for ceiling or wall. I can use any raspberry pi or uno but I
need to find out what i need to get get started.
Clock would be showing time on ceiling. There are couple available in market but thinking to make own.

Thank You

Gguiz
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Re: Projection Clock

Fri Apr 30, 2021 11:19 am

Hi onlinegill,

I am looking for a project like this with a Raspberry Pi 3. I would like to use the GPIO port to power and control the projector. Did you find your happiness? I tried to recover the projection part of an alarm clock but the 3.3V power supply from the Raspberry is not suitable for powering the laser, although it is also 3.3V.

If you found something, I'm interested!

Thank you !

ghp
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Re: Projection Clock

Fri Apr 30, 2021 6:40 pm


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Gavinmc42
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Re: Projection Clock

Sat May 01, 2021 12:12 am

That's a cool project.
Use a Pico.
Add USB and use GUD drivers for Pi USB display.
I'm dancing on Rainbows.
Raspberries are not Apples or Oranges

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HermannSW
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Re: Projection Clock

Sat May 01, 2021 7:29 am

More advanced projection clock uses as single laser only (and motors moving mirrors):
https://hackaday.io/project/165977-laser-galvo-clock
Image


P.S:
I really like playing with 2$ chinese green laser, measured that its beam has diameter 30cm over distance of 544(!) meters (photo shows my left forearm) - be careful !
viewtopic.php?t=281646#p1710772
Image
https://stamm-wilbrandt.de/2wheel_balancing_robot
https://stamm-wilbrandt.de/en#raspcatbot
https://github.com/Hermann-SW/Raspberry_v1_camera_global_external_shutter
https://github.com/Hermann-SW/raspiraw
https://stamm-wilbrandt.de/en/Raspberry_camera.html

Gguiz
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Re: Projection Clock

Mon May 03, 2021 5:46 pm

Hi !

Thanks for your replies ! It's great projects, I love it ! But I would like a very simple thing with a projector like this ; Image
My Raspberry already manages the alarm clock function and I would like to add this function.

Thanks again :)

PiGraham
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Re: Projection Clock

Mon May 03, 2021 6:19 pm

Gguiz wrote:
Mon May 03, 2021 5:46 pm
Hi !

Thanks for your replies ! It's great projects, I love it ! But I would like a very simple thing with a projector like this
You need a projection display.
Of course you can get those, but good ones are expensive not realy what you want.

You could get something like this
Image

I AM NOT RECOMENDING THAT PROJECTOR.
It's just a search result on eBay. There's a fair chance it doesn't work at all, but you could rely on buyer protection to refund in that case and try a different one.

It is cheap and it is undoubtedly very poor quality. It is not HD and it won't be anywhere near as bright as they claim
320 x 240P, 1080P supported
It seems to be called "vivbright L1 mini pocket projector" and some review videos of projectors f that name suggest it might be ok for your clock.
https://www.youtube.com/watch?v=dlF_5vsVKg0

But there are lots of super cheap projectors around. Look at some reviews.

But 320 x 240 is enough to draw all sorts of clock faces on a light coloured wall at night.
And HSMI input makes it easy to connect to your RPi.

You will find examples of displaying a clock full screen on HDMI so you might be able to add projection with a cheap and nasty projector like this. It could be similar to the low quality projector in a projection alarm clock.
Last edited by PiGraham on Mon May 03, 2021 6:32 pm, edited 2 times in total.

Gguiz
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Re: Projection Clock

Mon May 03, 2021 6:27 pm

No no !! I just want a digital clock display with electronic parts using GPIO !

ghp
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Re: Projection Clock

Mon May 03, 2021 7:01 pm

Some years ago I bought a piglow board with incredible bright LED. Used a slide projector lens bought on a flee market and 'throwed' an image to the ceiling. http://heppg.de/ikg/wordpress/?p=468
Arrange some LED on a board, either forming digits or like an analog clock. Or like this https://en.wikipedia.org/wiki/Binary_clock

PiGraham
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Re: Projection Clock

Mon May 03, 2021 7:44 pm

Gguiz wrote:
Mon May 03, 2021 6:27 pm
No no !! I just want a digital clock display with electronic parts using GPIO !
Go on then. make your own projector! You need a lens and some very bright LEDs to start with. How far have you got?

Or you could start without the complications of projectors (but you chose to put projector in the title) and just make a simple clock with some LEDs and resistors on GPIO.

You could start with a magnifying glass lens, but they are not ideal.
But why not buy a <£10 projector (a spare or repair item from eBay) and take the optics from that. If you prefer to wire up a display element yourself put some super bright LEDs on a proto board behind that lent assembly you can do that, and you get reasonable quality optics made to project onto walls.
That takes care of your main challenge.

Gguiz
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Re: Projection Clock

Tue May 04, 2021 3:32 pm

Hi,

Thanks for replies :)

I would like to use an existing projector that I took apart from an alarm clock ;
DSC00082.JPG
DSC00082.JPG (164.81 KiB) Viewed 941 times
It needs two power supplies ; one for laser in 3.3V and an other for clock in 1.5V.

My problem is when I plug the laser to the 3.3V of GPIO, the laser lacks power ... I don't know what can I do :roll:

gordon77
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Re: Projection Clock

Tue May 04, 2021 4:09 pm

I would suggest a 3.3v convertor fed from 5v, possibly switched by a transistor with a gpio if required.

Example https://shop.pimoroni.com/products/lm36 ... OTEALw_wcB

PiGraham
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Re: Projection Clock

Tue May 04, 2021 7:20 pm

Gguiz wrote:
Tue May 04, 2021 3:32 pm
My problem is when I plug the laser to the 3.3V of GPIO, the laser lacks power ... I don't know what can I do :roll:
How will you project a clock with this? Do you intend to use the clock laser and LCD, or strip those out and use the lens?
What did you want to do with GPIO?

If you want to power the laser get a power supply for that. Find out the voltage and current the laser requires.
Maybe use a DCDC converter or a driver module to provide the ideal voltage and current.

How was the donor clock powered? Can you reuse that power supply?

PiGraham
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Re: Projection Clock

Sun May 09, 2021 5:04 pm

Just for fun, because that projector was so cheap (was £10.30), I got one.

Using this CSS clock
https://codepen.io/tempo22/full/pEJxh


Projecting onto a door in a shaded room (the projector isn't very bright)

https://www.youtube.com/watch?v=n2QkvEu6aPg

HDMI input works fine with Pi.
Optics is good enough to resolve the pixels on the LCD (all 320x240 of them)
Last edited by PiGraham on Mon May 10, 2021 6:39 am, edited 2 times in total.

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Gavinmc42
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Re: Projection Clock

Mon May 10, 2021 1:09 am

When did those projectors get so cheap?
320x240 is good enough for a desktop AR sandpit.

Just use a RGB LED and pick 12 colours for the time?
Long blink for the hour, short blink for the tens of minutes.
Or use three LEDs and a triple lens from old MR16 LED light?
I'm dancing on Rainbows.
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PiGraham
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Re: Projection Clock

Mon May 10, 2021 7:20 am

Gavinmc42 wrote:
Mon May 10, 2021 1:09 am
When did those projectors get so cheap?
It is a crazy price, isn't it?
I guess there isn't that much to it. 320x240 pixel LCDs are super cheap. Super bright LEDs are also cheap. Possibly the main cost is the HDMI in drive board (it also has USB & SD card interfaces) Still I think this must be heavily discounted from it's original price.
I can't see there is a big market for something of this quality at any price. Good for wall clocks or VR sandboxes but you wouldn't want to watch a movie on it.

Its described on the box as "portable projector" but the label on the device itself is nearer the mark: "Kids projector"

Gguiz
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Re: Projection Clock

Fri May 21, 2021 11:24 am

Hi,

Thanks for replies :P

What I wanted to do was just plug a ready-made wake-up projector on my Raspberry to drive his ON/OFF with the GPIO. I thought there were some ready-made components or modules but couldn't find any. This has been dismantled but now out of service.

Thank you again for your answers and your advice which I keep aside ! ;)

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DougieLawson
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Re: Projection Clock

Fri May 21, 2021 11:30 am

PiGraham wrote:
Sun May 09, 2021 5:04 pm
Just for fun, because that projector was so cheap (was £10.30), I got one.
Two weeks later and it's doubled in price.
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Gavinmc42
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Re: Projection Clock

Fri May 21, 2021 11:43 am

Two weeks later and it's doubled in price.
Supply and demand?
Or did someone get yelled at for putting the wrong price on it?

The Pico has a RGB serial LED library?
Think I just figured out my first Pico project.
Can it do battery backed RTC?
I'm dancing on Rainbows.
Raspberries are not Apples or Oranges

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