Hi guys!
I am working on a project that requires me to use 12 bicolor LEDs (so 24 LEDs total). These lights are providing stimulus to 12 'subjects'. So the user can control which colour each light is and its brightness etc and we're looking to achieve 12 hours run time.
The LEDs I am using are these: http://www.lc-led.com/products/lc led-n300tby2d.html
And the circuit is this https://dl.dropboxusercontent.com/u/100324079/LEDMultiplex.png (Each Blue+Yellow combo is one bicolor LED)
We would like to be able to power the circuit for 12 hours so in order to calculate what batteries we would need ... I don't know! I've never done anything like this before (I'm learning electronics!).
The LEDs take a maximum 30mA each, so would we need to add that up for a total current (current is the same through things in series, but since its multiplexing, the circuit switches through each LED in cycle so would we need to have 30mA * 24? Or just 30mA in general?
I know batteries performance degrades over time, so I was looking at these type of batteries:
http://www.ebay.co.uk/itm/Lucas-12V...941675?hash=item2ec55165eb:g:Z8oAAOxy87tSFQ-v
The Arduino requires between 7V->12V supply input which it regulates to 5V. I believe 20Ah should be enough.
I'm sure I have all the info I need on the datasheet to figure this out but I'm struggling to get my head around it!
Thanks in advance!
I am working on a project that requires me to use 12 bicolor LEDs (so 24 LEDs total). These lights are providing stimulus to 12 'subjects'. So the user can control which colour each light is and its brightness etc and we're looking to achieve 12 hours run time.
The LEDs I am using are these: http://www.lc-led.com/products/lc led-n300tby2d.html
And the circuit is this https://dl.dropboxusercontent.com/u/100324079/LEDMultiplex.png (Each Blue+Yellow combo is one bicolor LED)
We would like to be able to power the circuit for 12 hours so in order to calculate what batteries we would need ... I don't know! I've never done anything like this before (I'm learning electronics!).
The LEDs take a maximum 30mA each, so would we need to add that up for a total current (current is the same through things in series, but since its multiplexing, the circuit switches through each LED in cycle so would we need to have 30mA * 24? Or just 30mA in general?
I know batteries performance degrades over time, so I was looking at these type of batteries:
http://www.ebay.co.uk/itm/Lucas-12V...941675?hash=item2ec55165eb:g:Z8oAAOxy87tSFQ-v
The Arduino requires between 7V->12V supply input which it regulates to 5V. I believe 20Ah should be enough.
I'm sure I have all the info I need on the datasheet to figure this out but I'm struggling to get my head around it!
Thanks in advance!