6. Case 05: Water Temperature Detection

6.1. Introduction

  • Fishes are poikilotherm whose body temperature changes as the ambient water temperature changes, thus, the water temperature plays a vital role in the growth of fishes.

6.2. Function

  • Dectect the water temperature with the DS18B20 sensor and display them on OLED screen.

6.4. Picture


6.5. Hardware Connection

Connect DS18B20 to P1 and the OLED to IIC on IoT:bit.


6.6. Software Programming

Click “Advanced” in the MakeCode to see more choices.


For programming, we need to add a package: click “Extensions” at the bottom of the MakeCode drawer and search with “iot-environment-kit” in the dialogue box to download it.


Notice: If you met a tip indicating that some codebases would be deleted due to incompatibility, you may continue as the tips say or create a new project in the menu.

6.7. Program

Initialize the OLED screen as 128×64.


Set DS18B20 sensor to connect to P1 and save the returned value as variable “Temp”.


Clear the OLED screen and display the water temperature.


Link: https://makecode.microbit.org/_Jx2d4JgU6iWj

6.8. Result

  • The OLED displays the water temperature and refreshes every 5 seconds.