# Appunti Raspberry/Python
<abstract>
Esempi di codice Python per Raspberry Pi
</abstract>
## Pinout Raspberry Pi 2
<img src="./rp2_pinout.png">
## blinker.py
import RPi.GPIO as GPIO
import time
led=2
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(led, GPIO.OUT)
while True:
GPIO.output(led, True)
time.sleep(1)
GPIO.output(led, False)
time.sleep(1)
## blinker2.py
import RPi.GPIO as GPIO
import time
led=2
switch=3
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(led, GPIO.OUT)
GPIO.setup(switch, GPIO.IN,pull_up_down=GPIO.PUD_UP)
while True:
if GPIO.input(switch):
GPIO.output(led, True)
time.sleep(1)
GPIO.output(led, False)
time.sleep(1)
else:
GPIO.output(led, False)
time.sleep(0.1)
## event.py
import RPi.GPIO as GPIO
import time
led=2
switch=3
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(led, GPIO.OUT)
GPIO.setup(switch, GPIO.IN,pull_up_down=GPIO.PUD_UP)
def my_callback(channel):
if GPIO.input(channel):
print "Rising edge detected"
else:
print "Falling edge detected"
GPIO.add_event_detect(switch, GPIO.BOTH, callback=my_callback)
while True:
GPIO.output(led, True)
time.sleep(1)
GPIO.output(led, False)
time.sleep(1)
## pulse.py
import RPi.GPIO as GPIO
import time
led=2
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(led, GPIO.OUT)
pwm = GPIO.PWM(led, 50)
while True:
for i in range(100):
time.sleep(0.01)
pwm.start(i)
for i in range(100,0,-1):
time.sleep(0.01)
pwm.start(i)
## webserver.py
from BaseHTTPServer import BaseHTTPRequestHandler,HTTPServer
PORT_NUMBER = 80
class myHandler(BaseHTTPRequestHandler):
def do_GET(self):
self.send_response(200)
self.send_header('Content-type','text/html')
self.end_headers()
self.wfile.write("Hello World !")
return
try:
server = HTTPServer(('', PORT_NUMBER), myHandler)
print 'Started httpserver on port ' , PORT_NUMBER
server.serve_forever()
except KeyboardInterrupt:
server.socket.close()
## remote.py
from BaseHTTPServer import BaseHTTPRequestHandler,HTTPServer
import RPi.GPIO as GPIO
import urlparse
PORT_NUMBER = 80
led=2
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(led, GPIO.OUT)
pwm = GPIO.PWM(led, 50)
class myHandler(BaseHTTPRequestHandler):
def do_GET(self):
parsed_path = urlparse.urlparse(self.path)
if parsed_path.path=="/":
self.send_response(200)
self.send_header('Content-type','text/html')
self.end_headers()
self.wfile.write("""
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<h1>Controllo luce</h1>
<br/>
<input type="range" min="0" max="100" value="0" class="slider" id="myRange">
<script>
var slider = document.getElementById("myRange");
var xhttp = new XMLHttpRequest();
slider.oninput = function() {
xhttp.open("GET", "/send?value=" + this.value, true);
xhttp.send();
}
</script>
</body>
</html>
""")
return
if parsed_path.path=="/send":
value=urlparse.parse_qs(parsed_path.query).get('value',None)
pwm.start(float(value[0]))
self.send_response(200)
self.send_header('Content-type','text/html')
self.end_headers()
self.wfile.write("Ok");
return
try:
server = HTTPServer(('', PORT_NUMBER), myHandler)
print 'Started httpserver on port ' , PORT_NUMBER
server.serve_forever()
except KeyboardInterrupt:
server.socket.close()
@include='bio_sergio_tanzilli'
2018 Ⓒ TanzoLab