DS1307 RTC module With Arduino (Tiny RTC ). 

very detailed and clear, thank you

you used the 2032 non li rechargeable battery? If so then wouldnt you remove the charging circuit from the ds 1307 because that will force the battery to charge and can cause it to explode.

can i buy this and use 24c32 eeprom only for store memory

Is it 12hr clock?

how i can do if it plot on my serial monitor a lot of no sense symbols? (on the example code)

Bom dia amigo. Muito bom seu projeto, bem explicativo e pratico. Parabéns. Vc poderia me dar um auxilio? Tenho um módulo de 8 relés e um rtc ds1307. Programei um horário para ligar o módulo, porem gostaria de ligar cada um dos relés em 1 minuto após o outro. Tipo ligo todos juntos as 12:00 e desligo um por minutos tipo 13:00, 13:01, 13:02, 13:03, 13:04, 13:05, 13:06, 13:07, 13:08. Teria como me dar um auxilio? Agradeço desde ja

how can ı fix "couldnt find rtc" eror ?

The sketch for the LCD has all kinds of errors in it! I had to edit the line for LiquidCrystal_I2C to say " LiquidCrystal_I2C lcd(0x27, 16, 2);".

how much peripherals could we connect parallely for sda&scl pins?????

Usiny my windows PC clock - I'm getting wrong time.

Your video is about led matrix esp8266 i took the code from that video but got the error "MD_MAX72xx.h: No such file or dictory" can you tell me how to fix it. Thanks

message d'erreur dans le code 'POSITIVE' was not declared in this scope