Python time.sleep_us() Examples

The following are 16 code examples of time.sleep_us(). You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may also want to check out all available functions/classes of the module time , or try the search function .
Example #1
Source File: hcsr04.py    From micropython-hcsr04 with Apache License 2.0 6 votes vote down vote up 
def _send_pulse_and_wait(self):
        """
        Send the pulse to trigger and listen on echo pin.
        We use the method `machine.time_pulse_us()` to get the microseconds until the echo is received.
        """
        self.trigger.value(0) # Stabilize the sensor
        time.sleep_us(5)
        self.trigger.value(1)
        # Send a 10us pulse.
        time.sleep_us(10)
        self.trigger.value(0)
        try:
            pulse_time = machine.time_pulse_us(self.echo, 1, self.echo_timeout_us)
            return pulse_time
        except OSError as ex:
            if ex.args[0] == 110: # 110 = ETIMEDOUT
                raise OSError('Out of range')
            raise ex
Example #2
Source File: gp2y1014au.py    From developer-badge-2018-apps with Apache License 2.0 6 votes vote down vote up 
def readVoRaw(self, samplingTime, deltaTime):
        # Turn on ILED
        self.sharpLEDPin.value(0)

        # Wait 0.28ms 
        time.sleep_us(samplingTime)

        VoRaw = self.sharpVoPin.read()

        # Wait 0.04ms
        time.sleep_us(deltaTime)

        # Turn off ILED
        self.sharpLEDPin.value(1)

        return VoRaw
Example #3
Source File: hcsr04.py    From pysmartnode with MIT License 6 votes vote down vote up 
def _pulse(self) -> int:
        """
        Send a pulse and wait for the echo pin using machine.time_pulse_us() to measure us.
        :return: int
        """
        tr = self._tr
        tr.value(0)
        time.sleep_us(5)
        tr.value(1)
        time.sleep_us(10)
        tr.value(0)
        try:
            return machine.time_pulse_us(self._ec, 1, self._to)
        except OSError as e:
            if e.args[0] == 100:  # TIMEOUT
                raise OSError("Object too far")
            raise e
Example #4
Source File: dust_firmware_avg.py    From developer-badge-2018-apps with Apache License 2.0 5 votes vote down vote up 
def readValue():
    global Voc, Vos, idx

    VoRaw = dust_sensor.readRawVo(220, 40) # adjusted 280 -> 220

    # Compute the output voltage in Volts.
    Vo = VoRaw / 4095.0 * 5.0

    # Exponential Moving Average
    # https://www.investopedia.com/terms/e/ema.asp
    # EMA(t) = Value(t)*k + EMA(y) * (1-k)
    # k = 2 / (N+1)
    # k = 0.005 where N = 399
    Vos = Vo * 0.005 + Vos * 0.995
        
    # print('{}, {}, {}, {}'.format(idx, VoRaw, Vo*1000.0, Vos*1000.0))

    density = (Vos - 0.6) / 0.5 * 100.0
    if density < 0:
      density = 0

    print('{}, {}, {}'.format(Vo*1000.0, Vos*1000.0, density*10))
    
    status_box.text(density+'ug/m3')

    idx += 1

    #time.sleep_us(10000 - 320)
    time.sleep_us(4000)
Example #5
Source File: dust_average.py    From developer-badge-2018-apps with Apache License 2.0 5 votes vote down vote up 
def readValue():
    global Voc, Vos, idx

    # Turn on ILED
    sharpLEDPin.value(0)

    # Wait 0.28 ms 
    time.sleep_us(280)

    VoRaw = sharpVoPin.read()

    # Wait 0.04 ms
    #time.sleep_us(40)

    # Turn off ILED
    sharpLEDPin.value(1)

    # Compute the output voltage in Volts.
    Vo = VoRaw / 4095.0 * 3.3

    # Exponential Moving Average
    # https://www.investopedia.com/terms/e/ema.asp
    # EMA(t) = Value(t)*k + EMA(y) * (1-k)
    # k = 2 / (N+1)
    # k = 0.005 where N = 399
    Vos = Vo * 0.005 + Vos * 0.995
    dV = Vos - Voc
    if dV < 0:
        dV = 0
        Voc = Vo

    # Convert to Dust Density in units of ug/m3.
    dustDensity = dV / K * 100.0
    
    print('VoRaw={}, Vo={} mV, Density={} ug/m3'.format(VoRaw, Vo*1000.0, dustDensity))

    idx += 1

    time.sleep_us(10000 - 320)
Example #6
Source File: dust_firmware.py    From developer-badge-2018-apps with Apache License 2.0 5 votes vote down vote up 
def readValue():
    global Voc

    # Turn on ILED
    sharpLEDPin.value(0)

    # Wait 0.28 ms 
    # time.sleep_us(280) # Actually, it took 0.4 ms.
    time.sleep_us(196) # It was measured about value of 0.28 ms

    VoRaw = sharpVoPin.read()

    # Wait 0.04 ms
    #time.sleep_us(40)

    # Turn off ILED
    sharpLEDPin.value(1)

    # Compute the output voltage in Volts.
    Vo = VoRaw / 4095.0 * 5.0

    # Convert to Dust Density in units of ug/m3.
    dV = Vo - Voc
    if dV < 0:
        dV = 0
        Voc = Vo
    
    dustDensity = dV / K * 100.0
    
    print('VoRaw={}, Vo={} mV, Density={} ug/m3'.format(VoRaw, Vo*1000.0, dustDensity))

    #time.sleep_us(10000 - 320)
    time.sleep_us(4000)
Example #7
Source File: dust.py    From developer-badge-2018-apps with Apache License 2.0 5 votes vote down vote up 
def readValue():
    global Voc

    # Turn on ILED
    sharpLEDPin.value(0)

    # Wait 0.28 ms 
    time.sleep_us(280)

    VoRaw = sharpVoPin.read()

    # Wait 0.04 ms
    #time.sleep_us(40)

    # Turn off ILED
    sharpLEDPin.value(1)

    # Compute the output voltage in Volts.
    Vo = VoRaw / 4095.0 * 3.3

    # Convert to Dust Density in units of ug/m3.
    dV = Vo - Voc
    if dV < 0:
        dV = 0
        Voc = Vo

    # Convert to Dust Density in units of ug/m3.
    dustDensity = dV / K * 100.0
    
    print('VoRaw={}, Vo={} mV, Density={} ug/m3'.format(VoRaw, Vo*1000.0, dustDensity))

    time.sleep_us(10000 - 320)
Example #8
Source File: pca9685.py    From 1ZLAB_PyEspCar with GNU General Public License v3.0 5 votes vote down vote up 
def freq(self, freq=None):
        if freq is None:
            return int(25000000.0 / 4096 / (self._read(0xfe) - 0.5))
        prescale = int(25000000.0 / 4096.0 / freq + 0.5)
        old_mode = self._read(0x00) # Mode 1
        self._write(0x00, (old_mode & 0x7F) | 0x10) # Mode 1, sleep
        self._write(0xfe, prescale) # Prescale
        self._write(0x00, old_mode) # Mode 1
        time.sleep_us(5)
        self._write(0x00, old_mode | 0xa1) # Mode 1, autoincrement on
Example #9
Source File: upcd8544.py    From Smart-IoT-Planting-System with MIT License 5 votes vote down vote up 
def sleep_us(self, useconds):
        try:
            time.sleep_us(useconds)
        except AttributeError:
            machine.udelay(useconds)
Example #10
Source File: upcd8544.py    From Smart-IoT-Planting-System with MIT License 5 votes vote down vote up 
def reset(self):
        """ issue reset impulse to reset the display """
        self.rst.value(0)  # RST on
        self.sleep_us(100) # reset impulse has to be >100 ns and <100 ms
        self.rst.value(1)  # RST off
        # Defaults after reset:
        self.power      = self.POWER_DOWN
        self.addressing = self.ADDRESSING_HORIZ
        self.instr      = self.INSTR_BASIC
        self.display_mode = self.DISPLAY_BLANK
        self.temp_coeff = self.TEMP_COEFF_0
        self.bias       = self.BIAS_1_11
        self.voltage    = 3060
Example #11
Source File: hcsr04.py    From uPySensors with Apache License 2.0 5 votes vote down vote up 
def _send_pulse_and_wait(self):
        """
        Send the pulse to trigger and listen on echo pin.
        We use the method `machine.time_pulse_us()` to get the microseconds until the echo is received.
        """
        self.trigger.value(0) # Stabilize the sensor
        time.sleep_us(5)
        self.trigger.value(1)
        # Send a 10us pulse.
        time.sleep_us(10)
        self.trigger.value(0)
        try:
            if (uname().sysname == 'WiPy'):
                pulse_list = pulses_get(self.echo, self.echo_timeout_us)
                if(len(pulse_list) == 0):
                    pulse_time = -1
                else:
                    pulse_time = pulse_list[0][1]
            else:
                pulse_time = time_pulse_us(self.echo, 1, self.echo_timeout_us)

            return pulse_time
        except OSError as ex:
            if ex.args[0] == 110: # 110 = ETIMEDOUT
                raise OSError('Out of range')
            raise ex
Example #12
Source File: ST7735.py    From uPySensors with Apache License 2.0 5 votes vote down vote up 
def _reset( self ) :
    '''Reset the device.'''
    self.dc(0)
    self.reset(1)
    time.sleep_us(500)
    self.reset(0)
    time.sleep_us(500)
    self.reset(1)
    time.sleep_us(500)
Example #13
Source File: RGB_LED.py    From MaixPy_scripts with MIT License 5 votes vote down vote up 
def write_clk(self):
        self.clk.value(0)
        time.sleep_us(20)
        self.clk.value(1)
        time.sleep_us(20)
Example #14
Source File: pca9685.py    From 1ZLAB_Face_Track_Robot with GNU General Public License v3.0 5 votes vote down vote up 
def freq(self, freq=None):
        if freq is None:
            return int(25000000.0 / 4096 / (self._read(0xfe) - 0.5))
        prescale = int(25000000.0 / 4096.0 / freq + 0.5)
        old_mode = self._read(0x00) # Mode 1
        self._write(0x00, (old_mode & 0x7F) | 0x10) # Mode 1, sleep
        self._write(0xfe, prescale) # Prescale
        self._write(0x00, old_mode) # Mode 1
        time.sleep_us(5)
        self._write(0x00, old_mode | 0xa1) # Mode 1, autoincrement on
Example #15
Source File: pca9685.py    From micropython-adafruit-pca9685 with MIT License 5 votes vote down vote up 
def freq(self, freq=None):
        if freq is None:
            return int(25000000.0 / 4096 / (self._read(0xfe) - 0.5))
        prescale = int(25000000.0 / 4096.0 / freq + 0.5)
        old_mode = self._read(0x00) # Mode 1
        self._write(0x00, (old_mode & 0x7F) | 0x10) # Mode 1, sleep
        self._write(0xfe, prescale) # Prescale
        self._write(0x00, old_mode) # Mode 1
        time.sleep_us(5)
        self._write(0x00, old_mode | 0xa1) # Mode 1, autoincrement on
Example #16
Source File: dust_average copy.py    From developer-badge-2018-apps with Apache License 2.0 4 votes vote down vote up 
def readValue():
    global Voc, Vos, idx

    # Turn on ILED
    sharpLEDPin.value(0)

    # Wait 0.28 ms 
    # time.sleep_us(280) # Actually, it took 0.4 ms.
    time.sleep_us(196) # It was measured about value of 0.28 ms

    VoRaw = sharpVoPin.read()

    # Wait 0.04 ms
    #time.sleep_us(40)

    # Turn off ILED
    sharpLEDPin.value(1)

    # Compute the output voltage in Volts.
    Vo = VoRaw / 4095.0 * 3.3

    # Exponential Moving Average
    # https://www.investopedia.com/terms/e/ema.asp
    # EMA(t) = Value(t)*k + EMA(y) * (1-k)
    # k = 2 / (N+1)
    # k = 0.005 where N = 399
    Vos = Vo * 0.005 + Vos * 0.995
    dV = Vos - Voc
    if dV < 0:
        dV = 0

    # Convert to Dust Density in units of ug/m3.
    dustDensity = dV / K * 100.0
    
    #print('VoRaw={}, Vo={} mV, Density={} ug/m3'.format(VoRaw, Vo*1000.0, dustDensity))
    
    print('{}, {}, {}'.format(idx, Vo*1000.0, Vos*1000.0))

    status_box.text(str(dustDensity)+'ug/m3')

    idx += 1

    #time.sleep_us(10000 - 320)
    time.sleep_us(4000)