I am trying to figure out what is going on with a 4051 Multiplexer that is giving me issues.
I have a + Power, a + Sensor, a - Power, and a - Sensor running into 4 channels of the 4051.
It seems to me that I am getting a connection between the + Power and the - Wires.
I would have assumed that the channels of the 4051 were isolated from each other, but this does not seem to be the case.
Is there a way to isolate the channels of the 4051? If not, do you know if there is a Multiplexer that has isolated channels?
Perhaps I am just completely misunderstanding what is going on!
do you have a link to the datasheet of the 4051?
Sensors must have common grounds and must be connected to the Arduino ground.
Edit Added GNDs
Don't allow the 4051 control lines to float or you may get erratic operation. I've used a high value resistor to ground on the control lines to make sure they don't float when not made high.