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by tanrax
Sun Jan 17, 2016 12:40 pm
Forum: Beginners
Topic: Is it possible to connect 64 LEDs and 64 buttons?
Replies: 12
Views: 1525

Re: Is it possible to connect 64 LEDs and 64 buttons?

It's possible, but you would need an I/O expander. 128 I/O is a lot. So if you wanted to buy something off the shelf, you're probably looking at buying more than one of them. For example this one has 32 I/O: https://www.abelectronics.co.uk/p/18/IO-Pi?CatName=0&c=0 Otherwise you could design and bui...
by tanrax
Sun Jan 17, 2016 12:38 pm
Forum: Beginners
Topic: Is it possible to connect 64 LEDs and 64 buttons?
Replies: 12
Views: 1525

Re: Is it possible to connect 64 LEDs and 64 buttons?

If you can scan the array, you only need 16 GPIO. You may need to add diodes if you require n-key rollover. Here’s an example: http://www.engineersgarage.com/sites/default/files/imagecache/Original/wysiwyg_imageupload/70003/KEYBOARD.jpg You can light 64 LEDs the same way - put them in anti-parallel...
by tanrax
Sun Jan 17, 2016 12:32 pm
Forum: Beginners
Topic: Is it possible to connect 64 LEDs and 64 buttons?
Replies: 12
Views: 1525

Re: Is it possible to connect 64 LEDs and 64 buttons?

Yes, it is possible. However for a sensible answer you need to say what you are trying to do. What do the buttons do? What do the LEDs show? What are you trying to do? Thank you all for the answers! My idea would be to create a physical chess playing against a bot. The buttons would be to see if th...
by tanrax
Sat Jan 16, 2016 7:32 pm
Forum: Beginners
Topic: Is it possible to connect 64 LEDs and 64 buttons?
Replies: 12
Views: 1525

Is it possible to connect 64 LEDs and 64 buttons?

I would like to do a project where I need to be independently led 64 and 64 buttons. Is it possible with the raspberry pi? Would you need Raspberry Pi Compute Module Kit?

Thanks in advance!
by tanrax
Wed Jul 11, 2012 9:35 pm
Forum: HATs and other add-ons
Topic: Supplement power of N900
Replies: 1
Views: 1180

Re: Supplement power of N900

I answer: it's good. Although it would be better with 1000mA (1A), instead of 700mA.
by tanrax
Wed Jul 11, 2012 3:21 pm
Forum: HATs and other add-ons
Topic: Supplement power of N900
Replies: 1
Views: 1180

Supplement power of N900

Hi all! If you were so kind, you help me solve my question? I wonder if my charger for my Nokia N900 would be compatible. I leave their characteristics: Input: 100-240V/ ~ 150mA 50-60Hz 10-20VA ___ Output: 5V ----- 700mA Thank you very much in advance.

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