[Noisebridge-discuss] Electronics Question

[Davidfine]

With an opto isolator you're really just powering a small LED inside the
packaging. Something between 1k and 150 ohm will probably not burn it
out too quickly - use the highest resistance that triggers it solidly.
And try it without the arduino first (but with a resistor).
--D

On 9/22/13 9:22 PM, Phil Spitler wrote:
> Hey list people, I have an electronics question that I wonder if
> somebody could help me with.
>
>
> Basically I'm trying to build a high speed photography rig based on this.
>
> http://mattrichardson.com/blog/arduino-flash-trigger-parts-list/
>
> I have fallen at the first hurdle which is to get the opto-issolator
> to work.
>
> I have a feeling it is due to the value of the resistor I'm using on
> the input.
>
> I have followed his instructions but it seems like the resistor value
> of  4.7k might be too high.
>
> I found the data sheet for the opto-issolator
> here http://pewa.panasonic.com/assets/pcsd/catalog/aqw-dip-2-form-a-catalog.pdf 
>
> And more info
> here. http://www.digchip.com/datasheets/parts/datasheet/724/AQW280EH.php
>
> I used an online resistor calculator
>  http://led.linear1.org/1led.wiz and put in the numbers that I found
> in the data sheet (I think) and it gave me a resistor value of 33 ohms.
>
> When I use the 4.7k resistor the opto-isolator doesn't do anything
> when the arduino pin goes high but I don;t want to use a much lower
> value in case I fuck the chip.
>
> Any ideas?
>
> Cheers.
>
> Phil
>
> *Phil Spitler*  |  Creative Technologist   |  *Bonfire Labs*  |  t :
> 415.394.8200  m : 415.571.3139
>
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