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Topic: Emulating SP3T switch (Read 645 times) previous topic - next topic


Has anyone emulated a SP3T switch using an arduino?  Is this even possible?  I have a 12V fan that I'm controlling the on/off via a relay, and the fan has a SP3T switch to control Low, Med, and Fast for the fan speed.  I'm curious if I can remove that switch and control that from the arduino or not. There are 3 wired running to the SP3T switch.



Just use 3 transistors to short the switches.  Be sure that the transistors are capable of handling the voltage/current concerned, and if the switches are "high" (i.e., between + and the fan) that you use PNP, and if they are "low" (i.e., between the fan and GND) you use NPN.


Thanks majenko!  That's pretty much what I thought my options were going to be. 

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