Thanks for replying. I meant is it ok to have that current going into those pins. I know that you can have up to 200mA going out between all of them, but going IN while it is set to output is unclear to me and I don't see it anywhere. Maybe it is a bit unorthodox.
I am also wondering if the same thing is ok for while it is set to input. I know there is another input state that could be used with higher resistance (pullup resistor). I don't know if that would be better though. If it is too high it would seem that the SSR LED couldn't work.
So this is a project that KrisBlueNZ helped me with almost a year ago. (I was a student in a school lab) This circuit was originally used on an older microcontroller board ZX-1280, and my PI had me adopt it to an Arduino Uno. I was dissapointed/sad to know that he is no longer with us.
So I did it and it is working but I'm concerned about the Arduino frying. I want to make sure it is ok to have up to 6 or even 8 of those on circuits seperate pins. It is already printed but I am now uncertain about programming it.
I have to leave them all on OutputHigh if I want the SSRs to be open. Since they are set to Input by default, they are all Closed at the moment except for the one I want to use. That means to me that the regulated 5V is pumping current through all those parallel resistors and LEDs, into the IC.
I'm trying to find out what is ok and what might not be for programming sketches. All High ok? All Low ok? All Input ok? Am I painting a good picture here?
I can change that 150Ohm resistor to what Kris recommended, 220-240 or even up to 330 Ohms. That would be much better I think since the current would then be between 15 and 22 mA. I don't know why but the person who checked and populated that board changed it. Maybe he had extras on hand.
I didn't mean to complicate things for you too much but that's the situation. Right now we have 1 board populated and that's what I'm working with, plus a second one I which might be populated also. I can add things to the next version but am very limited in options right now. Money doesn't grow on trees so we are going to use these for awhile and see how they go. (They are part of a maze system, most solenoid activation would be quite short but I want it robust, who knows what it will be used for later.) I graduated but am helping them out still and want to continue with this project.
Edit: The 5V is from the Arduino and the Pin in question is attached to 3 on the SSR, the "Solenoid Control Pin"