MEGAPIXEL

[Jacob]

I know initially we thought about using Bulbs instead of LEd's but after some deep thought i'm not quiet sure if its feasible anymore . The problems
1. Will they be brighter that using LED's that are point sources??
2.using higher wattage bulbs using 25 W bulbs ( 40 bulbs per socket so that means for 300 bulbs 8 sockets ) not only will increase the number of sockets required but will increase the over all cost as well.
3.Testing the overall bulb array in the MB will be impossible which will hinder circuit debugging.

Thoughts please.

[Shrinivas Chimmalgi]

Might I add that bulbs are more delicate. What was the output of the
currently used led's?power or luminous intensity....

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[Amit Raj]

Also... If u plan to use Relays.. isin't there some switching time and i am assuming it'll be hard to implement PWM and all?

[Jacob Varghese]

@chimmal:from what I remember they were rated the same as the regular red leds about 50mWs
thats equivalent .

@amit:using optotriacs should give u the switching speed we need but the bulbs cant handle them .

After inputs from TJ i think we can safely conclude that BULBS are definitely not gona happen. so lets look at LEDs shall we, If we want to move past the previous structure our best bet would be using higher wattage leds

0.5W to 1W leds . Pearl has a good stock of torch Leds that are pretty cheap we could look at those but driving them might not be easy.

from what I remember she said that we could go up to 2W with these.

 

Jacob Varghese

III year ,EEE department

NITK surathkal

INDIA

 

[Leela Prabhu]

If it doesnt take tooooooo much time, may be we can made a little prototype? very small?
 or just light up 4 bulbs... not with the relays and all.

Leela Prabhu

Vth Semester

ECE

[Jacob Varghese]

4 bulbs will work leelamma .  300-400 bulbs bulbs will also work leelamma if we had 8 sockets to test with which we don't so ...
 

[Leela Prabhu]

oh! Sorry.. :P Didnt read your mail properly. So, any new changes we making then? Since we are back to LEDs

[Shrinivas Chimmalgi]

Did u check the current drawn by these?What colour are they? Will uln2803 support them??another option is what i have attached.

On Sun, May 19, 2013 at 1:29 AM, Jacob Varghese <jacob...@gmail.com> wrote:

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SHRINIVAS J CHIMMALGI
3rd Year Mechanical Engineering
NITK Surathkal

[deep agarwal]

Apart from the brightness issues, the last two yrs Megapixel also had low gaming speed, difficulty level, delay etc.

Ppl appreciated the concept, but the gaming was not much fun.

So, a little more brightness and better planned gaming would be good.

[Shravya Boggarapu]

more than brightness, we need it to be spread out. you can't make out half the shapes as pixels... 
The speed issue was there mostly due to the interfacing time. We had to limit speed when coding. What can we do to increase hardware speed?

@Chethan, did the remote login method that we employed take more time? Is it faster with putty?

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Shravya Boggarapu

VI sem

Electronics and Communication Engg

National Institute of Technology Karnataka

[Amit Raj]

Are we using darlington instead of the TLC? cause we can't control PWM with the darlingtons

[Leela Prabhu]

@Shrinivas- Yea, these do have a higher rating but you can't interface these alone to the uC... like tlc..

On Mon, May 20, 2013 at 2:01 PM, Shravya Boggarapu <shravy...@gmail.com> wrote:

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[Chetan dugar]

@shravya: Yes its better if we use ssh. But I don't think we increase the rate at which we send signals in msp. We can try to optimize the code by sending more data per cycle.

[Chetan dugar]

@deep: we can make better games only if the brightness is more. Else the pixels are not visible and we need to spend more leds per pixel.

[leelaprabhu93]

Where are the latest codes put up?

Sent from Samsung Mobile

[leelaprabhu93]

We can drive larger current? Whats the max ratings of those LEDs? That'll make them faster. .. assuming the slowest part are the LEDs themselves. We can use the Darlington Shrinivas memtioned with shift registers. Or higher current rated TLCs.. if such a thing exists. Or use MOSFETs. Think any of these will help?

Sent from Samsung Mobile

-------- Original message --------
From: Amit Raj <amit1...@gmail.com>
Date: 20/05/2013 15:34 (GMT+05:30)
To: tech...@googlegroups.com

Subject: Re: [Technites:221] MEGAPIXEL

Are we using darlington instead of the TLC? cause we can't control PWM with the darlingtons

[Chetan dugar]

@leela: Shravya has the codes. She has given it to Oshim to go through

[Shashi Gowda]

Oi, you all upload code here or somewhere we all can see don't give it to each other.

Also, one good investment will be LAN cables! One from ISTE to Samudra Darshan and one from IT 6th floor lab to the terrace.

Wired LAN will get the controller latency to next to nothing. you can stream 1080p videos over wired LAN from room to lab.

[leelaprabhu93]

Hey. . What's the main cause of delay in Megapixel? 

[Chetan dugar]

@leela: We cannot increase the frequency of sending data above a particular limit, else it crashes.

[Leela Prabhu]

yeah... exactly, what is restricting the speed? hardware or code or transmission?

[Shashi Gowda]

Also why does it crash if you increase the frequency?
Are you sure there is no workaround?

[Jacob Varghese]

@amit : Darlington ( Y the He** cant we PWM with darlingtons) + TLC macha exactly like the waterfall fans . double darlingtons if required ... baan style :P  or something else if it cant handle it with TLC iff it can switch that fast.
@leelamma:Should ask the pearl lady for the exact specs dont even remember what the max power twas rated for . I'll run some tests with whatever I have .

@chetan : UART Baud rate hike caused the crash?? The bauds good enough rite . wen we tested it in the room it was pretty playable wasn't it DEEP?

@shashi: Bro ure getting us IT dept permission this time :)