coin mech and sensor

[vinvinslot]

Hi all, just two quick questions and need help. I am a strong believer of the saying: give a man a fish and he will eat for the day, but teach the man how to fish he can eat for a life-time... On that note, can anyone tell me how to check a sensor for working or not and the coil or (electromagnet) on a coin mech. for being ok. thanks VINVINSLOT

[vinvinslot]

Ok guys, found out how to check the electromagnet, simple Put 15vdc (thats what I used so I wouldnt blow the unit) it clicks its good! NOW can someone please help and tell me how to check a sensor. (door sensor,coin mach. sensor etc.) thanks in advance

[Drunkenclam]

a steady hand and a good volt meter.

Testing depends on the type of sensor. some are 3 pins some are 4, some more, Some don't like to work in daylight conditions and only work in dark enviroments. Some are photo reflective interrupters, some are slotted transmissive type.
But in the end it is all a switch, they will either send 5v when they detect something, or stop sending 5v when they detect something. (Not always 5V as well. Might be 3V)

It is why there is no definitive way of testing them. If you can find the model number on the side, you can look up the data table to see the pin allocations.

But here is an example of a slotted one

http://www.farnell.com/datasheets/9111.pdf

Pin 1 Anode
Pin 2 Cathode
Pin 3 Emitter Anode
Pin 4 Collector Cathode

And a reflective one. The pins are completely different on this one
http://www.farnell.com/datasheets/1725679.pdf

Pin 1 Collector
Pin 2 Emitter
Pin 3 Anode
Pin 4 Cathode

[vinvinslot]

way the go DRUNKENCLAM thanks so much! vinvinslot