def measure(trigger, echo):
bbio.digitalWrite(trigger, bbio.HIGH)
time.sleep(DECPULSETRIGGER)
bbio.digitalWrite(trigger, bbio.LOW)
# Wait for echo to go high (or timeout)
intcountdown = INTTIMEOUT
while (bbio.digitalRead(echo) == 0 and intcountdown > 0):
intcountdown = intcountdown - 1
# If echo is high
if intcountdown > 0:
# Start timer and init timeout countdown
echostart = time.time()
intcountdown = INTTIMEOUT
# Wait for echo to go low (or timeout)
while (bbio.digitalRead(echo) == 1 and intcountdown > 0):
intcountdown = intcountdown - 1
# Stop timer
echoend = time.time()
# Echo duration
echoduration = echoend - echostart
intdistance = (echoduration*1000000) / 58.0
return intdistance
def measure(trigger, echo):
bbio.digitalWrite(trigger, bbio.HIGH)
time.sleep(DECPULSETRIGGER)
bbio.digitalWrite(trigger, bbio.LOW)
# Wait for echo to go high (or timeout)
intcountdown = INTTIMEOUT
while (bbio.digitalRead(echo) == 0 and intcountdown > 0):
intcountdown = intcountdown - 1
# If echo is high
if intcountdown > 0:
# Start timer and init timeout countdown
echostart = time.time()
intcountdown = INTTIMEOUT
# Wait for echo to go low (or timeout)
while (bbio.digitalRead(echo) == 1 and intcountdown > 0):
intcountdown = intcountdown - 1
# Stop timer
echoend = time.time()
# Echo duration
echoduration = echoend - echostart
intdistance = (echoduration * 1000000) / 58.0
return intdistance
def is_activated(self):
"""
Tells the user if the button is activated or not.
:returns: True if the button is activated, False otherwise.
:rtype: boolean
"""
return io.digitalRead(self.__pin) == io.HIGH
def onPinChange():
global count
global state
new_state = bbio.digitalRead(PIN)
if new_state == state:
print "Got pin change by value is same; missed one?"
else:
state = new_state
count += 1
def start(freq):
global count
global state
pwm_run = open(PWM_DIR+'run', 'w')
pwm_run.write('0')
pwm_duty = open(PWM_DIR+'duty_ns', 'w')
pwm_duty.write('0')
pwm_period = open(PWM_DIR+'period_ns', 'w')
period = round((1.0/freq)*1e9)
duty = round(period/2.0)
pwm_period.write('%d' % period)
pwm_period.close()
pwm_duty.write('%d' % duty)
pwm_duty.close()
count = 0
state = bbio.digitalRead(PIN);
bbio.attachInterrupt(PIN, onPinChange, bbio.BOTH);
pwm_run.write('1')
pwm_run.close()
