Embedded Files
Objective:
To become familiar with Neopixels and the NeoPixel code extension
To become familiar with functions and flags
Makecode---> Extensions----> Neopixels
An Extension is additional code blocks which can be added to give additional functionality
Neopixels are programmable LEDs with 3 inputs- Vcc, GND, Signal
Below: Any change in the Neopixels needs to be followed by a 'show' instruction
Below: Any change in the Neopixels needs to be followed by a 'show' instruction
Challenges:
Challenges:
(1) Make a Neopixel Traffic Light that changes from Green(2 sec)--->Yellow(1 sec)---->Red(2 sec)---Repeat
(1) Make a Neopixel Traffic Light that changes from Green(2 sec)--->Yellow(1 sec)---->Red(2 sec)---Repeat
(2) Add a Walk Request Button: If a Walk Request button is pushed at any time, on the next cycle, the Red light is for 5 seconds, and "Walk" is displayed on the LED matrix
(2) Add a Walk Request Button: If a Walk Request button is pushed at any time, on the next cycle, the Red light is for 5 seconds, and "Walk" is displayed on the LED matrix
Hints:
Define a standard light cycle function(standard)
Define a walk request cycle function(walk)
Define a walk request variable( a 'flag') that is changed from 0 to 1 when a button
Define a main loop that calls walk if the request is made, else it calls standard
Flags
Flags
In programming, a flag is a predefined bit or bit sequence that holds a binary value. Typically, a program uses a flag to remember something or to leave a sign for another program.
In programming, a flag is a predefined bit or bit sequence that holds a binary value. Typically, a program uses a flag to remember something or to leave a sign for another program.
Traffic lights, as an example, have different cycles, depending upon whether someone has pushed the button requesting the 'walk' function.
Traffic lights, as an example, have different cycles, depending upon whether someone has pushed the button requesting the 'walk' function.
By creating a 'flag' variable that monitors whether or not a button has been pushed, we do not have to continuously hold the walk request button to initiate a walk cycle.
By creating a 'flag' variable that monitors whether or not a button has been pushed, we do not have to continuously hold the walk request button to initiate a walk cycle.
When the requested cycle has started, the flag is reset.
When the requested cycle has started, the flag is reset.
Printable Handout:
Printable Handout:
Microbits Week 3 pdf.pdfPage updated
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