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Cookie tin alarm

Débutant | MakeCode, Python | Capteur de luminosité, Écran LED | Capteurs, Nombre & valeur de lieu , Sélection

Étape 1 : Fais-le

Qu'est-ce que c'est ?

Has anyone been in your cookie tin? You can program your BBC micro:bit to act as an alarm to let you know! You will learn about selection, comparison logic, and the micro:bit's light sensor.

Ces deux vidéos vous montrent ce que vous allez faire et comment le coder :

Comment ça marche

  • The program turns the micro:bit’s LED display into a light sensor.
  • Put your micro:bit into the tin you wish to protect. When the lid is opened, the light sensor detects a change in light level and triggers the alarm.
  • Le programme utilise une boucle infinie pour mesurer sans cesse le niveau de lumière.
  • Selection ('if... else') and comparison logic (> 30) are used so that if the light level is above a certain amount, an angry face appears on the display; else, it clears the screen.

Ce dont vous aurez besoin

  • micro:bit (ou simulateur MakeCode)
  • L'éditeur MakeCode
  • boitier de piles
  • our set-up guide may be useful

Étape 2 : Programme-le

Étape 3 : Améliore-le

  • Adjust the program, removing the "else" part of the comparison, so that the angry face remains on the micro:bit’s display whatever the light level so that you can tell someone has opened your tin.
  • Add an audible alarm using blocks from the music section of the MakeCode editor.
  • Count how many times your tin has been opened by introducing a variable into the program.
  • If you have two micro:bits, use the radio function to send you a signal as soon as your tin has been opened. Take a look at the light alarm project to find out how to do this.