Welcome to BBC Microbit repository
5.Temperature alarm
1. Learning goals
In this lesson, we will learn to use the micro:bit on board buzzer and thermometer. Micro:bit will detect the motherboard chip temperature in real time. When the chip temperature exceeds a certain value, the buzzer will sound an alarm.
2. Mode 1 online programming:
First, we need to connect the micro:bit to the computer by USB cable. The computer will pop up a USB flash drive and click on the URL http://microbit.org/ in the USB flash drive to enter the programming interface to start program.
Mode 2 offline programming:
We need to open the offline programming software. After the installation is complete, enter the programming interface, click【New Project】, you can start program.
3.Looking for blocks
The following is the location of the building blocks required for this programming.
4.Combine block
The summary program is shown below.
Program analysis:
Set the temperature value to the variable "i" and display it on the LED dot matrix. When the chip temperature is greater than 31 ℃, the alarm sound effect will be played.
You can modify the temperature threshold according to the current use environment by yourself.
5.Experimental phenomena
After connecting the computer to the micro:bit board via the micro USB data cable. Click download or save on the programming interface, and the program can be successfully downloaded to the Micro:bit board.
We can see the micro:bit dot matrix displays the current temperature.
For example, my current temperature is 29 ℃. After a while, the temperature of the Micro:bit chip will reach 31 ℃. At this time, the buzzer will sound an alarm. Place the Micro:bit board in front of the fan. When the temperature of the board drops, the buzzer will stop the alarm.