Opto-Sensor that to produce an out put signal at complete darkness. 1

[rob40]

hey folk. I need an opto-sensor that will produce a trigger signal when covered completely or at minimum of 90% darkness....
I tryed to check Omron and Optek,and I found nothing.

thanks for your help

 

[nbucska]

The simplest would be a phototransistor and a comparator. If you need more help send specs <nbucska@pcperipherals.com>