Raspberry Kit support

Welcome to Malina V4: Raspberry kit support page. Here you can download all the files necessary for our kit completion. Also, the source code for every project is provided.

Setup

If you've got no spare monitor or keyboard, you may connect Raspberry Pi via SSH, VNC, and FTP protocols. Complete instruction is provided at the beginning of the book. Here are all the third-party programs you need for that.

For Windows

• Angry IP Scanner
• VNC-Viewer
• FileZilla

For MacOS

• Angry IP Scanner
• VNC-Viewer
• FileZilla

3. Blink

import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)
GPIO.setup(17, GPIO.OUT)

try:
    while True:
        time.sleep(0.5)
        GPIO.output(17, GPIO.HIGH)
        time.sleep(0.5)
        GPIO.output(17, GPIO.LOW)
except KeyboardInterrupt:
    print('The program was stopped by keyboard.')
finally:
    GPIO.cleanup()
    print('GPIO cleanup completed.')

4. Button

import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)
GPIO.setup(2, GPIO.IN)

while True:
    time.sleep(0.5)
    button = GPIO.input(2)
    print(button)

Transfer the button variable to the output function to control the LED.

while (True):
    button = GPIO.input(2)
    GPIO.output(24, button)

Don't forget to add the pin initialization code for the output:

GPIO.setup(24, GPIO.OUT)

Finally, adding exceptions handling:

import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)
GPIO.setup(2, GPIO.IN)
GPIO.setup(24, GPIO.OUT)

try:
    while True:
        button = GPIO.input(2)
        GPIO.output(24, button)
except KeyboardInterupt:
    print('The program was stopped by keyboard.')
finally:
    GPIO.cleanup()
    print('GPIO cleanup completed')

5. Switch

import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BCM)
GPIO.setup(8, GPIO.IN)
GPIO.setup(24, GPIO.OUT)
GPIO.setup(26, GPIO.OUT)

try:
    while True:
        button = GPIO.input(8)
        if button == False:
            GPIO.output(24, GPIO.HIGH)
            GPIO.output(26, GPIO.LOW)
        else:
            GPIO.output(24, GPIO.LOW)
            GPIO.output(26, GPIO.HIGH)

except KeyboardInterrupt:
    print('The program was stopped by keyboard.')
finally:
    GPIO.cleanup()
    print('GPIO cleanup completed.')

6. LED brightness

import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)
GPIO.setup(18, GPIO.OUT)
pwm = GPIO.PWM(18, 1000)
dutyCycle = 50
pwm.start(dutyCycle)

try:
    while True:
        time.sleep(0.01)
        dutyCycle = dutyCycle + 1
        if dutyCycle > 100:
            dutyCycle = 0
        pwm.ChangeDutyCycle(dutyCycle)

except KeyboardInterrupt:
    print('The program was stopped by keyboard.')
finally:
    GPIO.cleanup()
    print('GPIO cleanup completed.')

7. Light control panel

import RPi.GPIO as GPIO


def isPressed(btn, led):
    if GPIO.input(btn) == False:
        GPIO.output(led, GPIO.HIGH)
    else:
        GPIO.output(led, GPIO.LOW)


button1 = 3
button2 = 4
led1 = 14
led2 = 15

GPIO.setmode(GPIO.BCM)
GPIO.setup(button1, GPIO.IN)
GPIO.setup(button2, GPIO.IN)
GPIO.setup(led1, GPIO.OUT)
GPIO.setup(led2, GPIO.OUT)

try:
    while True:
        isPressed(button1, led1)
        isPressed(button2, led2)
except KeyboardInterrupt:
    print('The program was stopped by keyboard.')
finally:
    GPIO.cleanup()
    print('GPIO cleanup completed.')

8. Massive optimization

import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)
leds = [12, 13, 14, 18]

for led in leds:
    GPIO.setup(led, GPIO.OUT)
    GPIO.output(led, GPIO.HIGH)

time.sleep(3)

for led in leds:
    GPIO.output(led, GPIO.LOW)

GPIO.cleanup()

import RPi.GPIO as GPIO


def isPressed(btn, led):
    state = 1 - GPIO.input(btn)
    GPIO.output(led, state)


leds = [12, 13, 14, 18]
buttons = [2, 3, 4, 8]

GPIO.setmode(GPIO.BCM)
for i in range(4):
    GPIO.setup(leds[i], GPIO.OUT)
    GPIO.setup(buttons[i], GPIO.IN)

try:
    while True:
        for i in range(4):
            isPressed(buttons[i], leds[i])
except KeyboardInterrupt:
    print('The program was stopped by keyboard.')
finally:
    GPIO.cleanup()
    print('GPIO cleanup completed.')

9. Web server

from flask import Flask

app = Flask('simpleServer')


@app.route('/')
def index():
    return 'Hello, Amperka!'


app.run(port=3000, host='0.0.0.0')

10. Landing page

Web-server archive download line bellow:

wget http://raspberry.amperka.com/web-server.zip -0 web-server.zip

from flask import Flask, send_file

app = Flask('landingPage')

@app.route('/')
def index():
    return send_file('landing.html')

@app.route('/images/<filename>')
def get_image(filename):
    return send_file('images/'+filename)

app.run(port=3000, host='0.0.0.0')

Sometimes following steps 8 to 12, you can get console message:
socket.error: [Errno 48] Address already in use
It means that the server is still running. In this case, use a command:

ps -u | grep python

You will get the list of all processes running. Find the line landing.py, check its number in the second column, and kill it with the command:

kill -9 xxx

where xxx is the number of the line. Then start the server again.

11. LED remote control

from flask import Flask, send_file
import RPi.GPIO as GPIO

led = 18

GPIO.setmode(GPIO.BCM)
GPIO.setup(led, GPIO.OUT)

app = Flask('lightControl')


@app.route('/')
def index():
    return send_file('light.html')


@app.route('/images/<filename>')
def get_image(filename):
    return send_file('images/' + filename)


@app.route('/turnOn')
def turnOn():
    GPIO.output(led, GPIO.HIGH)
    return 'turnedOn'


@app.route('/turnOff')
def turnOff():
    GPIO.output(led, GPIO.LOW)
    return 'turnedOff'

try: 
    app.run(port=3000, host='0.0.0.0')
finally:
    GPIO.cleanup()
    print('GPIO cleanup completed.')

12. Feedback

from flask import Flask, send_file
from flask_socketio import SocketIO
import RPi.GPIO as GPIO

app = Flask('feedback')
socketio = SocketIO(app)

btn = 2

GPIO.setmode(GPIO.BCM)
GPIO.setup(btn, GPIO.IN)


@app.route('/')
def index():
    return send_file('feedback.html')


@app.route('/images/<filename>')
def get_image(filename):
    return send_file('images/' + filename)


@socketio.on('isPressed')
def checkButton(receivedData):
    if GPIO.input(btn) == False:
        socketio.emit('button', 'pressed')
    else:
        socketio.emit('button', 'released')


try: 
    socketio.run(app, port=3000, host='0.0.0.0')
finally:
    GPIO.cleanup()
    print('GPIO cleanup completed.')

13. Weather phidget

import requests, json

url = "http://api.openweathermap.org/data/2.5/forecast"

payload = {
    "lat": "your_city_latitude",
    "lon": "your_city_longitude",
    "units": "metric",
    "appid": "your_key",
}

res = requests.get(url, params=payload)
data = json.loads(res.text)

weather = data["list"][0]


def pars_weather(weatherType, timeRange, measurementUnits):
    if (weatherType in weather) and (
        timeRange in weather[weatherType].keys()
    ):
        print(
            weatherType,
            ": ",
            weather[weatherType][timeRange],
            measurementUnits,
        )
    else:
        print(weatherType, ": ", "none")


pars_weather("clouds", "all", "%")
pars_weather("rain", "3h", "mm")
pars_weather("snow", "3h", "mm")
print("temp:", weather["main"]["temp"], "C")

Our own version of weather phidget:

http://raspberry.amperka.com/weather.py

16. Torrents

There are the movies that are distributed via CC (Creative Commons) license. That means, that one can share and modify these materials in any way. You only have to give a credit to the original authors. Here is one of those:

• "BIG BUCK BUNNY" — a funny Blender Foundation movie about a big bunny seeking peace and quiet. Use .mp4 file.

17. Movie theater

OMX-web.zip link:

http://raspberry.amperka.com/omx-web.zip