high impedace circuit

[dxtr]

Hey everybody
i need some help about high impedance ,
i have a microcontroller with 1 ADC channel , the problem is that i have 2 senors , i think about reading from 1 sensor and make the other act like open circuit ( the microcontroller will select wich one its going to be read).
i want to make something like this :

**broken link removed**

my question is if the transistor 1 is blocked , will the correspendant sensor be in high impedance ?

 

[torbai]

You need an analog multiplexer, for example, 74HC4051

 

[dxtr]

You need an analog multiplexer, for example, 74HC4051

thank you so much , exactly what i was looking for