8. case 06 NTC#

8.1. 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.

8.3. Hardware Connect#

../../_images/Tk7Ddy9.png

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

8.4. Principles of Circuits#

../../_images/8pV3WaA.png

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

8.5. 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.

../../_images/M3k99Lj.png

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

8.6. Software#

Step 1#

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

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

../../_images/t34k5Zb.png

Step 2#

Reduction Formula:

../../_images/sTfPnYc.png

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.

../../_images/N91GU48.png

Show the temperature value and pauce a second.

../../_images/poCULlT.png

Program#

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

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

8.7. Result#

Show the current temperature on the micro:bit allay.

8.8. Think#

8.9. Questions#

8.10. More Information#