[Noisebridge-discuss] Electronics Question
phil at bonfirelabs.com
Mon Sep 23 04:22:42 UTC 2013
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.
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.
Phil Spitler | Creative Technologist | Bonfire Labs | t : 415.394.8200 m : 415.571.3139
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