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sleemanj / DS3231_Simple

An Arduino Library for EASY communication with DS3231 I2C RTC Clock and Atmel AT24C32 I2C EEPROM commonly found on the same board. Implements setting, getting the time/date, setting, checking and clearing alarms, and dead-easy circular-buffered logging of data with timestamp.
MIT License
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Wake Arduino from Sleep #3

Closed zstergios closed 7 years ago

zstergios commented 7 years ago

I have wrote a test sketch https://ufile.io/989881

It supposed that the DS3221 it will powered by the coin battery and not permanlty from the arduino power.

So VCC connected to PIN 13 pinMode(13, OUTPUT); digitalWrite(13, HIGH); Clock.begin();

When the PIN-13 goes LOW, DS3221 does not send any signal (interrupt) to arduino.

I have connected to UNO: VCC to PIN 13 GND to GND SDA to A4 SCL to A5

Seems like not keeps in memory the alarms? Any help?

sleemanj commented 7 years ago

If you set Pin 13 to Low, you are probably short-circuiting the battery on the clock module.

Send Pin 13 to high impedance state (INPUT), not low.

zstergios commented 7 years ago

I don't think it causes shot-circuit. Module is compatible with v3/v5 logic. Library works great without sleep.

But when the arduino sleeps, SQW (connected to PIN2) works only with permanent power supply of arduino.

I'm reading over the Internet, and says to set to 1HZ the SQW, I don't know how to do that with the library.

What I want: 1)setAlarm 2) Sleep, then the DS3231 will be powered by coin battery 3) DS3231 wakes arduino, and is powered by arduino VCC (I think it's the only way to send commands to RTC)

geologic commented 7 years ago

You need to do some dessoldering if you want to use alarms with coin cell power: https://edwardmallon.wordpress.com/2014/05/21/using-a-cheap-3-ds3231-rtc-at24c32-eeprom-from-ebay

You just need to remove the resistor array, but it is goog idea to get rid of the led and charging circuit

zstergios commented 7 years ago

Thank's mate!

zstergios commented 6 years ago

The solution should be added to library @sleemanj http://prntscr.com/hcst87 Comment from https://edwardmallon.wordpress.com/2014/05/21/using-a-cheap-3-ds3231-rtc-at24c32-eeprom-from-ebay/comment-page-1/#comment-2431

zstergios commented 6 years ago

Can you please add function to squareWave enable/disable?

There is already implemented to other library, but I would like to work with yours