.. note::

    Hello, welcome to the SunFounder Raspberry Pi & Arduino & ESP32 Enthusiasts Community on Facebook! Dive deeper into Raspberry Pi, Arduino, and ESP32 with fellow enthusiasts.

    **Why Join?**

    - **Expert Support**: Solve post-sale issues and technical challenges with help from our community and team.
    - **Learn & Share**: Exchange tips and tutorials to enhance your skills.
    - **Exclusive Previews**: Get early access to new product announcements and sneak peeks.
    - **Special Discounts**: Enjoy exclusive discounts on our newest products.
    - **Festive Promotions and Giveaways**: Take part in giveaways and holiday promotions.

    👉 Ready to explore and create with us? Click [|link_sf_facebook|] and join today!

.. _ar_thermistor:

2.27 Thermistor
===============

Overview
-------------

In this lesson, you will learn how to use thermistor. Thermistor can be
used as electronic circuit components for temperature compensation of
instrument circuits. In the current meter, flowmeter, gas analyzer, and
other devices. It can also be used for overheating protection,
contactless relay, constant temperature, automatic gain control, motor
start, time delay, color TV automatic degaussing, fire alarm and
temperature compensation.

Components Required
------------------------

.. image:: img/Part_two_27.png

* :ref:`cpn_mega2560`
* :ref:`cpn_breadboard`
* :ref:`cpn_wires`
* :ref:`cpn_resistor`
* :ref:`cpn_thermistor`

Fritzing Circuit
----------------------

In this example, we use the analog pin A0 to get the value of
Thermistor. One pin of thermistor is connected to 5V, and the other is
wired up to A0. At the same time, a 10kΩ resistor is connected with the
other pin before connecting to GND.

.. image:: img/image218.png
    :align: center

Schematic Diagram
-----------------------

.. image:: img/image219.png
   :align: center

Code
-----------

.. note::

    * You can open the file ``2.27_thermistor.ino`` under the path of ``sunfounder_vincent_kit_for_arduino\code\2.27_thermistor`` directly.
    * Or copy this code into Arduino IDE.



.. raw:: html

    <iframe src=https://create.arduino.cc/editor/sunfounder01/b4d8972d-3667-477e-b152-e87656b6f578/preview?embed style="height:510px;width:100%;margin:10px 0" frameborder=0></iframe>

After uploading the code to the Mega2560 board, you can open the serial
monitor to check the current temperature. The Kelvin temperature is
calculated according to the formula
**T\ K\ =1/(ln(R\ T/R\ N)/B+1/T\ N).**

Phenomenon Picture
------------------------

.. image:: img/image220.jpeg
   :align: center