M5Stack Real Time Clock (RTC) Unit

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Product Link

M5Stack Real Time Clock (RTC) UnitOpenELAB

Description

UNIT RTC is a programmable real-time clock module, integrated HYM8563 low-power CMOS real-time clock/calendar chip, using I2C communication interface, full-coverage case can effectively protect the circuit, making its operation more stable. Applicable to a variety of embedded devices, instruments and instruments as a system clock.

Role of RTC

Most MCUs are built-in timers, which usually start working automatically when the hardware is powered on, and reset when the hardware is powered off. The built-in timer can handle some simple timing tasks, but if we want to implement data timestamp recording, clock, alarm clock and other time-span functions, a system power-independent clock RTC is the best choice.

Features

• Support second/minute/hour/day/month/year. time data reading and writing

• 32.768kHz high-precision clock crystal, greatly reducing the time error

• Low power consumption, coin battery can work continuously for years

• With century mark

• I2C communication interface

Applications

• Clock, alarm clock

• Power down time synchronization

Specifications

Specifications	Parameters
Clock chip	HYM8563
Crystal Frequency	32.768kHz
Communication interface	I2C, addr: 0x51, bus max speed 400Kbps
Power supply voltage	5V DC
Net weight	4.1g
Gross Weight	8.3g
Product Dimensions	48 * 24 * 8mm
Package Size	136 * 92 * 13mm

Schematic

Related Links

• Datasheet

  • HYM8563

Example

Arduino

• M5Unit-RTC - with M5Series

• M5Unit-RTC III with M5Atom

• M5Unit-RTC III with M5Core

• M5Unit-RTC III with M5Core2

• M5Unit-RTC III with M5StickC

• M5Unit-RTC III with M5StickCPlus

UIFlow Example

• Clock Example

• Timer Example

• Alarm Example

UIFlow

• Set RTC(year(0 - 99), month, date, weekday(1 - 7), hour, minute, second)

  • weekday

    • 1: Sunday

    • 2: Monday

    • 3: Tuesday

    • 4: Wednesday

    • 5: Thursday

    • 6: Friday

    • 7: Saturday

• Get RTC Get list of RTCData. ex. (22, 7, 23, 6, 13, 0, 0) notice: Before UIFlow v1.10.1

  • year(0 - 99)

  • month(1 - 12)

  • date(0 - 31)

  • weekday(1:Sunday - 7:Saturday)

  • hour(0 - 23)

  • minute(0 - 59)

  • second(0 - 59)

• Get RTC Get RTCData. notice: After UIFlow v1.10.2

  • year(0 - 99)

  • month(1 - 12)

  • date(0 - 31)

  • weekday(1:Sunday - 7:Saturday)

  • hour(0 - 23)

  • minute(0 - 59)

  • second(0 - 59)

• Set alarm (date, hour, minute) Set the alarm date and time.

• Check alarm flag Returns True at the specified date and time.

• Turn off alarm Turn off alarm and reset alarm flag.

• Disable alarm

• Set timer value(count, unit) Set timer in minutes or seconds.

• Get timer value Get current timer count.

• Check timer flag Returns True at the specified date and time.

• Turn off timer Reset timer flag. but timer count don't stop.

• Disable timer. Reset timer flag and count stop .

• Pause timer. Pause timer count.

• Resume timer. Resume after pause is executed.