Let me start by saying that I’m a totally newcomer to the Arduino world so my question may seem noob by after hours of googling I didn’t found what I’m looking for.
I’m helping a friend that needs to use 34 lasers to work as digital independent switches.
Since we have to keep this a low cost project, I was thinking on using the “Mini Photocell” from SparkFun as the light sensor.
This brings me to my first question. Since this photocell is a variable resistance, is there a way to use it on one of the digital pins since I have more of those than the analog ones?
Second question is, even if I manage to use it on the digital pins, I still don’t have 34 of them. Following the same low cost approach, is there a way to have more pins ?
Any support is welcome. Thank you.