This project uses a 5V buzzer and 2 buttons to test your reaction time versus a friend, it will allow you to use code and a few supplies to make your own reaction game.

Supplies

Pi Pico

Buzzer 5V

Arcade Button x 2

Wires x 9

Step 1: Code for Execution

from machine import Pin, PWM

import utime

import urandom

# GPIO pin definitions

RED_BUTTON_PIN = 21

BLUE_BUTTON_PIN = 27

RED_LED_PIN = 22

BLUE_LED_PIN = 18

BUZZER_PIN = 3

# Setup

red_button = Pin(RED_BUTTON_PIN, Pin.IN, Pin.PULL_UP)

blue_button = Pin(BLUE_BUTTON_PIN, Pin.IN, Pin.PULL_UP)

red_led = Pin(RED_LED_PIN, Pin.OUT)

blue_led = Pin(BLUE_LED_PIN, Pin.OUT)

buzzer = PWM(Pin(BUZZER_PIN))

def sound_buzzer_start(freq=1000):

buzzer.freq(freq)

buzzer.duty_u16(20000)

def sound_buzzer_stop():

buzzer.duty_u16(0)

def main():

while True:

red_led.value(0)

blue_led.value(0)

# Random delay between 1000 and 4999 ms

delay_ms = urandom.getrandbits(10) % 4000 + 1000

utime.sleep_ms(delay_ms)

# Start buzzer

sound_buzzer_start()

reaction_start = utime.ticks_ms()

winner = None

# Wait for a button press

while True:

if red_button.value() == 0:

winner = 'red'

red_led.value(1)

break

if blue_button.value() == 0:

winner = 'blue'

blue_led.value(1)

break

if utime.ticks_diff(utime.ticks_ms(), reaction_start) >= 500:

sound_buzzer_stop()

utime.sleep_ms(5)

reaction_time = utime.ticks_diff(utime.ticks_ms(), reaction_start)

sound_buzzer_stop()

print(f"{winner.upper()} wins! Reaction time: {reaction_time} ms")

utime.sleep(2)

# Start game

main()

Step 2: Wiring Diagram

Wiring Diagram to follow when putting together pico

Step 3: Ground Wires

Connect ground pins to each other

be sure to do the right pins and don't connect the 2 sides

Step 4: Anode Wires

Connect anode wires

Make sure each has their own wires

Step 5: Buzzer Wires

Connect both anode and ground wires to buzzer

Step 6: Button Pico Connections

Connect wires to corresponding pin on the pico

Introduction: Pi Pico Reaction Light Game