Electronics > Beginners

NO to NC conversion - need help

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ScotY:
Hello guys,

I'm new here and, while I have a fascination with electronics, I do struggle a LOT. :o  I have a wireless CNC tool height setter gizmo and would like to repurpose it.  As it came, it has a battery operated plunger sensor/switch/transmitter that is NO.  When a tool comes down and contacts the sensor pad, it closes the switch and sends a signal to the receiver unit.  The receiver unit is NO and closes when a signal is received.  I want to use the transmitter with a NC touchprobe.  My CNC controller wants a NC signal.  So, both the transmitter and receiver need some sort of circuitry to convert the NO to NC.  Can someone help me figure out how to do this?  The TX circuitry must be as compact as possible, the RX circuitry doesn't matter so much. 

Thanks in advance and I hope I have provided enough information to explain.

Scot

helius:
You can't really "convert NO to NC" as there is no information about electrical potential. The circuit connected to the switch may be AC to drive a relay, or 5VDC to power a TTL device, or something else. If everything is just run from 5V, it can be as simple as a single PNP transistor as a voltage inverter.

FriedMule:
First listen to helius and all other, before listening to me, I am properly less knowledgeable then you but my suggestion would be to use a relay that are NC so that when your circuit sends a NC the extra relay goes NO and opposite. (Warning may not work!!)

ScotY:
I had found this thread which gave me the idea:
https://www.eevblog.com/forum/beginners/converting-a-normally-open-pushbutton-to-normally-closed/

I didn’t mention earlier but the transmitter runs off 2 AA batteries. The receiver can run off 5-24vdc but I will probably use 5v. While the above mentioned thread sounds like it might work for me, I am not sure and the voltages used in his example are different from mine.

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