9. case 06 NTC

9.1. Introduction

The temperature sensor is a sensor that can sense the temperature and convert the temperature to output signal. The temperature sensor is core of temperature measurement instrument.

9.2. Products Link

ELECFREAKS Experiment Box Kit

9.3. Hardware Connect

Connect circuit as above picture and put 2 AAA batteries into batteries pack.

9.4. Principles of Circuits

The GND of slot on micro:bit is into innards of batteries’ GND to generate current loop.

9.5. Introduction of Components

NTC

The NTC is an analog temperature sensor where the output voltage and temperature form a liner relationship. The higher the temperature, the larger the output voltage. The experiment box included a NTC.

Note: Please note the positive and the negative when you are connecting.

9.6. Software

Step 1

Click makecode https://makecode.microbit.org/#。

Click on “New Project” and set a new Project.

Step 2

Reduction Formula：

The reading is an analog value of the IO port, we need a formula as above to convert the values into Celsius.

Step 3

Set “Temperature” as a variable to store the Celsius. As above formula, convert the values of P0 into Celsius.

Show the temperature value and pauce a second.

Program

Program link：https://makecode.microbit.org/_h8hUjXYFM0yH

You also could directly download program by visiting website as below:

9.7. Result

Show the current temperature on the micro:bit allay.

9.8. Think

9.9. Questions

9.10. More Information