ReactionTest.py File Reference

Created on Thu Jan 21 08:17:48 2021. More...

Functions
def	ReactionTest.buttonPress (which_pin)
	Button press function for external interrupt. More...

Variables
	ReactionTest.extint = ExtInt(pyb.Pin.cpu.C13,pyb.ExtInt.IRQ_FALLING,pyb.Pin.PULL_UP,buttonPress)
	Set up external interrupt on button C13 of STM32-NUCLEO-L476RG.
	ReactionTest.tim = pyb.Timer(2,period = 0x7FFFFFFF, prescaler = 83)
	Set up timer 2 for interrupts, scaling to count in microseconds.
	ReactionTest.LED = pyb.Pin(pyb.Pin.cpu.A5)
	Set up LED pin A5 on MCU.
bool	ReactionTest.buttonFlag = False
	Define flag for button presses.
bool	ReactionTest.firstFlag = True
	Define flag to determine whether initial print statement should show.
	ReactionTest.startTime = tim.counter()
	Record the start count for the timer in microseconds.
	ReactionTest.currTime = tim.counter()
	Update the current count for the timer in microseconds.
	ReactionTest.split = currTime - startTime
	Calculate the reaction time of the user.

Detailed Description

Created on Thu Jan 21 08:17:48 2021.

Author

Miles Young

Date

01/21/2021

Reaction time testing game
This program tests the user's reaction time, similar to the popular 90's toy Bop-it. The program employs an external interrupt associated with a built-in button on the board to quickly determine when the button has been pressed. To begin the game, the user is prompted to press the button at least once. When the user has done this, a green built-in LED will light up at a random time between 2 and 3 seconds after the starting press and stay lit for 1 second. Once the LED has lit, the user must press the button at least once more to stop the stopwatch. The time recorded by the stopwatch will then be printed, and the game will reset. If the user fails to press the button before the LED turns off, a motivational message is printed.

Function Documentation

buttonPress()

def ReactionTest.buttonPress

(

which_pin

)

Button press function for external interrupt.

This function is called by the external interrupt on the built-in button C13. It changes a global variable buttonFlag to true if it is currently false, or else keeps it true if it is currently true. This is intended to allow the button to be pressed multiple times, with manual resets of buttonFlag required in the body of the program.