Hi to all friends
i would like to use my Arduino to read from multiple analog sensors in one analog pin.
i decide to use some pc817 optocouplers as switches (not to isolate)
From my code i will set High each pin in sequence to drive each optocoupler then take the reading and store it in array , set the digital pin low and then go to the next digital .
above is the schematic for my setup.
i have tried it with a breadboard and i think i am not getting the right readings... i am not sure if the method with the diodes at the end is the best to isolate the thermistors from each other.
has any one a better solution or part to use in the thermistors output pin ?
thanks in advance