Hello, I am new to higher voltage electronics, so forgive me for my ignorance. I am trying to use a Banner mini-beam SM321CV light sensor ( http://www.fileden.com/files/2007/10/21/1529625/03365.pdf
) (I have to use this sensor) to send data (voltage high or voltage low) to an Arduino so I can program the Arduino to tell the user whether or not the sensor is detecting what it is supposed to monitor. Programming the Arduino is something I think I can work through with time, but I want to make sure my circuit and parts will fit the bill. In other words, I want the Arduino to read information (digital is my only concern) from the light sensor.
The SM312CV outputs 10-30V DC with a maximum current of 150mA. Well my little Arduino can't handle such massive voltages/currents, so I thought about adding a solid-state relay between the light sensor and the digital I/O pin. It was really hard to find a SSR that would be control a small voltage circuit, as controlled by a large voltage circuit, as SSRs are usually made for the exact opposite purpose. I choose an SSR because I needed a very reliable circuit, and optical isolation seems the way to go. But as I often learned, if the tool doesn't seem to fit the task, it probably isn't the right tool, but I just don't know of a more reliable solution without making a massive circuit (I would prefer to keep this tiny if possible).
I chose the 84145001 SSR ( http://www.crouzet-ssr.com/english/products/download/simm_ssr_output.pdf
), as it seems to fit my desired range the best.
10-44V (I want 10-30V)
6mA max current (my sensor has 150mA max, this feels like it could be a problem)
5-48V DC (I only need 5V)
500mA (I was planning to simply use a couple of resistors (roughly 10ohm 2.5W rated) to create a current divider to lower this to 30mA)
However, this one seemed pretty close to my desired specs too, http://eshop.wieland-electric.com/shop/showdatasheetpdf.jsp
Note: I have not bought the parts yet (except for the sensor), so I am just planning it out right now.
Here is my really bare schematic: (
Any help would be appreciated.