Hi @brow its a prototype for an entertainment “gun” (therefore holster where to put it) that is later used in a darkride. There are several guns, each one has a holster in the chariot and each one needs to be calibrated once a ride is finished. For this calibration its easier if I would have a way to identify which gun is put into which holster
So my idea/first approach is to use RFID to check if the gun is in the holster and in which one.
Unfortunately, the RFID reader has a firmware bug I describe here and while @paulvha has found the reason for it, it is not yet clear if there is a way to fix the firmware (or is fixed by Sparkfun @TS-Russell ?)
So I am looking into reliable alternatives at least for detection if the gun is present in the holster or not. If photo interruptor is the way to go, I do that and find another way for identification gun/holster.