Hi,
Ive been cracking my head around whole day on a simplest way to read 2 different analog sensors on 1 analog pin (hardware constraint). I saw some example on how some guy did this with periodically powering one sensor and then the other using 2 digital pins as outputs and reading them, but this doesent work for me as my sensor need some heating time on power-up to work correctly so I need them to be powered all the time but periodically read their output ( for example 30 seconds from one sensor, then 30 seconds from other sensor) on single analog input pin on the board. I know relay module can be used as SPDT switch to do this but the problems is I cant have that clicking sound the relay makes. I was thinking about some kind of 2:1 MUX that can work with analog signals or making SPDT switch that would be controlled with digital pin or something like that if anyone has a simple solution for me?
74HC4051 (or -2 or -3)
Thanks man Ive searched for it on my local store website but couldn't find the one Ive needed. I can always order dozen online but don't feel like waiting for weeks for them to arrive. Can I make a spdt switch myself using some transistors or whatever? If not Ill just have to order those and wait I guess.
I trust you checked the datasheets for those three analog switch ICs, you can choose which will be most useful to you.
Could you just use some transistors? It's a bit like asking whether you can build your own computer with some transistors. 
These are the ICs which do the job you want; they do the exact job you want. They are very standard and readily available components To replicate the function would require very particular FETs which are not as common as the ICs and would be even more difficult to obtain.
For something a little smaller, maybe dg419.
Yeah Thanks for the help I get what youre saying I need to order up I guess.