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№1 слайд![Raspberry PI. Описание](/documents_6/564999d48441729bde819c5e31f9cee1/img0.jpg)
Содержание слайда: Raspberry PI. Описание возможностей GPIO
лекция 1
№2 слайд![Raspberry PI](/documents_6/564999d48441729bde819c5e31f9cee1/img1.jpg)
Содержание слайда: Raspberry PI 3
№3 слайд![CSI камера](/documents_6/564999d48441729bde819c5e31f9cee1/img2.jpg)
Содержание слайда: CSI камера
№4 слайд![GPIO](/documents_6/564999d48441729bde819c5e31f9cee1/img3.jpg)
№5 слайд![I C](/documents_6/564999d48441729bde819c5e31f9cee1/img4.jpg)
№6 слайд![I C. Датчика давления,](/documents_6/564999d48441729bde819c5e31f9cee1/img5.jpg)
Содержание слайда: I2C. Датчика давления, температуры и влажности BME280 производства Bosch Sensortec
№7 слайд![UART](/documents_6/564999d48441729bde819c5e31f9cee1/img6.jpg)
№8 слайд![SPI](/documents_6/564999d48441729bde819c5e31f9cee1/img7.jpg)
№9 слайд![Аналоги Raspberry](/documents_6/564999d48441729bde819c5e31f9cee1/img8.jpg)
Содержание слайда: Аналоги Raspberry
№10 слайд![Raspbian](/documents_6/564999d48441729bde819c5e31f9cee1/img9.jpg)
Содержание слайда: Raspbian
№11 слайд![raspberry-gpio-python](/documents_6/564999d48441729bde819c5e31f9cee1/img10.jpg)
Содержание слайда: raspberry-gpio-python
Importing the module
try:
import RPi.GPIO as GPIO
except RuntimeError:
print("Error importing RPi.GPIO! This is probably because you need superuser privileges. You can
achieve this by using 'sudo' to run your script")
Pin numbering
GPIO.setmode(GPIO.BOARD) mode = GPIO.getmode()
# or
GPIO.setmode(GPIO.BCM)
№12 слайд![Channels Warnings](/documents_6/564999d48441729bde819c5e31f9cee1/img11.jpg)
Содержание слайда: Channels
Warnings
GPIO.setwarnings(False)
Setup up a channel
GPIO.setup(channel, GPIO.IN)
GPIO.setup(channel, GPIO.OUT)
GPIO.setup(channel, GPIO.OUT, initial=GPIO.HIGH)
chan_list = [11,12] # add as many channels as you want!
# you can tuples instead i.e.:
# chan_list = (11,12)
GPIO.setup(chan_list, GPIO.OUT)
Input
To read the value of a GPIO pin:
GPIO.input(channel)
This will return either 0 / GPIO.LOW / False or
1 / GPIO.HIGH / True.
№13 слайд![Cleanup GPIO.cleanup channel](/documents_6/564999d48441729bde819c5e31f9cee1/img12.jpg)
Содержание слайда: Cleanup
GPIO.cleanup(channel)
GPIO.cleanup( (channel1, channel2) )
GPIO.cleanup( [channel1, channel2] )
import atexit
def cleanup():
GPIO.cleanup()
print("Cleaning up!!")
atexit.register(cleanup)
№14 слайд![Inputs Pull up Pull down](/documents_6/564999d48441729bde819c5e31f9cee1/img13.jpg)
Содержание слайда: Inputs
Pull up / Pull down resistors
GPIO.setup(channel, GPIO.IN, pull_up_down=GPIO.PUD_UP)
# or
GPIO.setup(channel, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
Снимок в определенный момент
if GPIO.input(channel):
print('Input was HIGH')
else:
print('Input was LOW')
Или цикл:
(this assumes that pressing the button changes the input from LOW to HIGH)
while GPIO.input(channel) == GPIO.LOW:
time.sleep(0.01) # wait 10 ms to give CPU chance to do other things
№15 слайд![Inputs. Как опрашивать](/documents_6/564999d48441729bde819c5e31f9cee1/img14.jpg)
Содержание слайда: Inputs. Как опрашивать правильно?
Interrupts and Edge detection!
LOW -> HIGH = rising edge
HIGH -> LOW = falling edge
wait_for_edge() function
GPIO.wait_for_edge(channel, GPIO.RISING) Блокировка программы!!!
# wait for up to 5 seconds for a rising edge (timeout is in milliseconds)
channel = GPIO.wait_for_edge(channel, GPIO_RISING, timeout=5000)
if channel is None:
print('Timeout occurred')
else:
print('Edge detected on channel', channel)
event_detected() function
GPIO.add_event_detect(channel, GPIO.RISING) # add rising edge detection on a channel
do_something()
if GPIO.event_detected(channel):
print('Button pressed')
№16 слайд![Threaded callbacks def my](/documents_6/564999d48441729bde819c5e31f9cee1/img15.jpg)
Содержание слайда: Threaded callbacks
def my_callback(channel):
print('This is a edge event callback function!')
print('Edge detected on channel %s'%channel)
print('This is run in a different thread to your main program')
GPIO.add_event_detect(channel, GPIO.RISING, callback=my_callback) # add rising edge detection on a channel
...the rest of your program...
def my_callback_one(channel):
print('Callback one')
def my_callback_two(channel):
print('Callback two')
GPIO.add_event_detect(channel, GPIO.RISING)
GPIO.add_event_callback(channel, my_callback_one)
GPIO.add_event_callback(channel, my_callback_two)
№17 слайд![Switch debounce](/documents_6/564999d48441729bde819c5e31f9cee1/img16.jpg)
Содержание слайда: Switch debounce (шумоподавитель)
You may notice that the callbacks are called more than once for each button press. This is as a result of what is known as 'switch bounce'. There are two ways of dealing with switch bounce:
add a 0.1uF capacitor across your switch.
software debouncing
a combination of both
To debounce using software, add the bouncetime= parameter to a function where you specify a callback function. Bouncetime should be specified in milliseconds. For example:
# add rising edge detection on a channel, ignoring further edges for 200ms for switch bounce handling
GPIO.add_event_detect(channel, GPIO.RISING, callback=my_callback, bouncetime=200)
or
GPIO.add_event_callback(channel, my_callback, bouncetime=200)
№18 слайд![Пример, на input coding utf-](/documents_6/564999d48441729bde819c5e31f9cee1/img17.jpg)
Содержание слайда: Пример, на input
# coding: utf-8
import RPi.GPIO as GPIO
import time, datetime
import atexit
import lab_work_3_telegram
def cleanup():
GPIO.cleanup()
print("Cleaning up!!")
atexit.register(cleanup)
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(19,GPIO.IN)
GPIO.setup(20,GPIO.IN)
def mic_fc_04(channel): #power 3.3v
if GPIO.event_detected(channel):
print(str(datetime.datetime.now()),' Шум в помещении!')
№19 слайд![GPIO Outputs . First set up](/documents_6/564999d48441729bde819c5e31f9cee1/img18.jpg)
Содержание слайда: GPIO Outputs
1. First set up RPi.GPIO
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BOARD)
GPIO.setup(12, GPIO.OUT)
2. To set an output high:
GPIO.output(12, GPIO.HIGH)
# or
GPIO.output(12, 1)
# or
GPIO.output(12, True)
3. To set an output low:
GPIO.output(12, GPIO.LOW)
# or
GPIO.output(12, 0)
# or
GPIO.output(12, False)
№20 слайд![PWM Широтно-импульсная](/documents_6/564999d48441729bde819c5e31f9cee1/img19.jpg)
Содержание слайда: PWM
Широтно-импульсная модуляция (ШИМ, англ. pulse-width modulation (PWM)) — процесс управления мощностью, подводимой к нагрузке, путём изменения скважности импульсов, при постоянной частоте.
№21 слайд![Using PWM in RPi.GPIO To](/documents_6/564999d48441729bde819c5e31f9cee1/img20.jpg)
Содержание слайда: Using PWM in RPi.GPIO
To create a PWM instance:
p = GPIO.PWM(channel, frequency)
To start PWM:
p.start(dc) # where dc is the duty cycle (0.0 <= dc <= 100.0)
To change the frequency:
p.ChangeFrequency(freq) # where freq is the new frequency in Hz
To change the duty cycle:
p.ChangeDutyCycle(dc) # where 0.0 <= dc <= 100.0
To stop PWM:
p.stop()
№22 слайд![Using PWM in RPi.GPIO An](/documents_6/564999d48441729bde819c5e31f9cee1/img21.jpg)
Содержание слайда: Using PWM in RPi.GPIO
An example to brighten/dim an LED:
import time
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BOARD)
GPIO.setup(12, GPIO.OUT)
p = GPIO.PWM(12, 50) # channel=12 frequency=50Hz
p.start(0)
try:
while 1:
for dc in range(0, 101, 5):
p.ChangeDutyCycle(dc)
time.sleep(0.1)
for dc in range(100, -1, -5):
p.ChangeDutyCycle(dc)
time.sleep(0.1)
except KeyboardInterrupt:
pass
p.stop()
GPIO.cleanup()
№23 слайд![Checking function of GPIO](/documents_6/564999d48441729bde819c5e31f9cee1/img22.jpg)
Содержание слайда: Checking function of GPIO channels
gpio_function(channel)
Shows the function of a GPIO channel.
For example:
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BOARD)
func = GPIO.gpio_function(pin)
will return a value from:
GPIO.IN, GPIO.OUT, GPIO.SPI, GPIO.I2C, GPIO.HARD_PWM, GPIO.SERIAL, GPIO.UNKNOWN