:param float timeout: How long to wait for the device
:return: True if device is ready, False otherwise
"""
t = I2CTransaction()
t.s().a(self.chip_write_address).p()
deadline = time() + timeout
while time() < deadline:
r = self.device.i2c_run(t)
if r.ack(1):
return True
return False
if __name__ == "__main__":
# This example works with any device supporint I2CHelper API.
dev = ArduinoUnoTwi('COM7')
eeprom = Eeprom24lc32(dev)
dev.connect()
dev.i2c_enable = True
# You can experiment with higher speeds, but it can fail ACK if you
# use longer wires or inadequate pull-up resistors. 25kHz is a safe bet.
dev.i2c_clock = ArduinoUnoTwi.I2CClock.F25k
message = b'A secret message'
print('Message size: %s' % len(message))
print('Writing: %s...' % message, end='')
eeprom.write(0, message)
"""
# The code below is equivalent to the following transaction
# t = I2CTransaction()
# t.s().a(self.write_address).w(self.CMD_START_CONVERT).p()
# r = self.device.i2c_run(t)
self.device.i2c_start()
self.device.i2c_address(self.write_address)
self.device.i2c_write(self.CMD_START_CONVERT)
self.device.i2c_stop()
if __name__ == "__main__":
arduino = ArduinoUnoTwi('/dev/ttyACM0')
#arduino = ArduinoLeonardo('/dev/ttyACM0')
arduino.connect()
arduino.i2c_enable = True
arduino.i2c_verbose = False # True will dump every I2C transaction to console
dev = Ds1721(arduino, chip_address=0b111)
print('*** Configure DS1721')
dev.configure()
print('*** Start conversion - it should take ~750ms')
dev.start_conversion()
while True:
