class RTC – real time clock

The RTC is an independent clock that keeps track of the date and time.

Example usage:

rtc = machine.RTC()
rtc.init((2014, 5, 1, 4, 13, 0, 0, 0))
print(rtc.now())

Constructors

class machine.RTC(id=0, ...)

Create an RTC object. See init for parameters of initialization.

Methods

RTC.init(datetime)

Initialise the RTC. Datetime is a tuple of the form:

(year, month, day[, hour[, minute[, second[, microsecond[, tzinfo]]]]])

RTC.now()

Get get the current datetime tuple.

RTC.deinit()

Resets the RTC to the time of January 1, 2015 and starts running it again.

RTC.alarm(id, time, *, repeat=False)

Set the RTC alarm. Time might be either a millisecond value to program the alarm to current time + time_in_ms in the future, or a datetimetuple. If the time passed is in milliseconds, repeat can be set to True to make the alarm periodic.

RTC.alarm_left(alarm_id=0)

Get the number of milliseconds left before the alarm expires.

RTC.cancel(alarm_id=0)

Cancel a running alarm.

RTC.irq(*, trigger, handler=None, wake=machine.IDLE)

Create an irq object triggered by a real time clock alarm.

• trigger must be RTC.ALARM0

• handler is the function to be called when the callback is triggered.

• wake specifies the sleep mode from where this interrupt can wake up the system.

Constants

RTC.ALARM0

irq trigger source