[Noisebridge-discuss] Electronics Question

[Davidfine]

If you search the internet for info on your component (one of the
numbers silkscreened on top) you'll find a datasheet pdf. Those often
have example circuits with proper resistor values. 33ohm would be on the
low side for this kind of part, I wouldn't go lower than 100ohm for fear
of burning it out. That's the other thing, opto-isolators are very easy
to burn out. All you may need to do is start over with a new one. I
always buy a couple extra for this reason.
--D

On 9/23/13 11:45 PM, Phil Spitler wrote:
> With some help from Mitch tonight I dug a little deeper into the issue.
>
> Basically the OptoIsolator (opto-relay) seems to be working, we
> measured resistance across the output pins and when we powered it up
> the resistance went to ~26ohms.
>
> So, I got a 27ohm resistor and used that to short out my flash unit
> and it fired but still when I connect the flash unit across the output
> of the optoIsolator it doesn't fire.
>
> Is anybody up for giving me hand at Noisebridge to troubleshoot this?
> I would love to solve the mystery and get tis part of my project sorted.
>
> Much appreciated.
>
> Phil
>
>
>
> *Phil Spitler*  |  Creative Technologist   |  *Bonfire Labs*  |  t :
> 415.394.8200  m : 415.571.3139
>
> Website <http://bonfirelabs.com/> | Facebook
> <http://www.facebook.com/bonfirelabs> | LinkedIn
> <http://www.linkedin.com/company/235257?trk=tyah>
>
>
>
>
>
>
>
>
>
>
> On Sep 22, 2013, at 9:46 PM, Davidfine wrote:
>
>> 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
>>>
>>> Website <http://bonfirelabs.com/> | Facebook
>>> <http://www.facebook.com/bonfirelabs> | LinkedIn
>>> <http://www.linkedin.com/company/235257?trk=tyah>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
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