I am trying to wrap my mind around a design for a long light sensor bar. This is actually a laser sensor that needs to sense a moving laser beam continuously over a certain distance. I would need this sensor to be modular so I could make the sensor bar longer or shorter depending on the application. Think 2" x 6" pcb size that could have 30 connected together.
My thought is to design pcb that has a lot of phototransistors on it (thinking ALS-PT19) and tying the open collector outputs together. So as the laser hits the sensor at least one of the photo transistors is on and outputting a high signal. Then I would have connectors where I could plug a 2nd pcb (exactly the same) board in that would tie even more phototransistor outputs together. In the end there could be hundreds of the phototransistors tied together.
Basically, I don't care how many of the phototransistors are on. If even one phototransistor is on I want a high signal.
So does that make sense at all? Is there an issue with this design? Or would that work?