Optocoupler Circuit Using arduino
I have designed up an optocoupler circuit to work with a 24v photoeye. Basically I am using the optocoupler to reduce the 24 volts that is supplied from the photoeye (24V when nothing in front of photoeye and 0 v when something is in front of it). The 5V side is basically shorted when when there is 24 volts from the photoeye. I would like to post a schematic so that is easier to understand what I am saying. Is there a good preferably free progam to draw up quick schemaitcs in that I can post on ehre for people to see?