# Analog Sensors

We will briefly give an overview of connecting an analog sensor.
We have already given an example with the temperature sensor tutorial [here](/Tutorials/Circuits/temp_sensors/tempsensor.md).

This LM35 Temperature sensor provides a voltage that is directly proportional to the temperature and we connect it to one of the analog inputs of the microprocessor.

```{admonition} Analog Inputs
:class: important
It should be noted that not all the connections on a microprocessor can be used as analog inputs.
For the Arduino Uno, the analog inputs are separately labelled to the digital inputs/outputs

On the Pico, refer to the pin diagram which will tell you that GP26, 27 & 29 are the Analog inputs (labelled as ADC for analog to digital converter)
```