Grove Base Kit for Raspberry Pi - Lesson 2: Button with a red LED

Lesson 2: Button with red LED

Objective

Using the Grove - a button with a red LED to control the LED flashing and to allow the buzzer to generate various sound effects.

Hardware requirement

Prepare:

  • microUSB cable
  • Raspberry Pi 3 Model B
  • Computer

Included in the set

  • Grove Base Hat
  • Grove wire
  • Grove - button with red LED
  • Grove - Buzzer

Connecting equipment

Step 1: Use the Grove cable to connect the Grove-Buzzer to the PWM port and the Grove-Buzzer to the red LED button to D5 on the Base Hat, and put an overlay on the Raspberry Pi.

Step 2: Connect the Raspberry Pi to the power source using the microUSB cable.

Programming

Step 1: Enter the following commands to create a Python file

cd grove.py
nano lesson_2.py

Step 2: Copy the following code

#!/usr/bin/env python

import time
from mraa import getGpioLookup
from upm import pyupm_buzzer as upmBuzzer

from grove.button import Button
from grove.grove_ryb_led_button import GroveLedButton

def main():
    # Grove - LED Button connected to port D5
    button = GroveLedButton(5)

    # Grove - Buzzer connected to PWM port
    buzzer = upmBuzzer.Buzzer(getGpioLookup('GPIO12'))

    def on_event(index, event, tm):
        if event & Button.EV_SINGLE_CLICK:
            print('single click')
            button.led.light(True)
            buzzer.playSound(upmBuzzer.BUZZER_DO, 500000)

        elif event & Button.EV_LONG_PRESS:
            print('long press')
            button.led.light(False)
            buzzer.playSound(upmBuzzer.BUZZER_DO, 1000000)

    button.on_event = on_event

    while True:
        time.sleep(1)

if __name__ === '__main__':
    main()

Step 3：Uruchomprogram

sudo chmod +x lesson_2.py
sudo ./lesson_2.py

Success

If everything goes well, you will see that when you press the button for a long time, the LED will go out and the buzzer will give a long "Do" sound. If you press the button once, the LED will light up and the buzzer will give a short "Do" sound.

 

pi@raspberrypi:~/grove.py $ sudo ./lesson_2.py
single click
single click
single click
long press
single click
long press
long press
Traceback (most recent call last):
  File "./lesson2.py", line 34, in 
    main()
  File "./lesson2.py", line 31, in main
    time.sleep(1)
KeyboardInterrupt
^Araspberrypipe: ~/grove.

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