Homemade Arduino digital watch | internal 8MHz clock

Thanks to JLCPCB for supporting this video.

You will learn how to use the ATMega328p-AU smd version chip using the internal 8MHz clock. Also, the low power mode for this chip.

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[rishabhkumardjain]

To increase the precision upto a minute, you can blink minute LED from 1 to 5 times. Ex- 2 times for 1:02 and 3 times for 1:03 and so on

[the_perigoso]

project that needs precise timing? let's use the internal oscillator! better yet also use an mcu without rtc!
you could at least have showed how to use the internal oscillator calibration registers

[nielsgillet]

Good realisation but why are you still using Arduino IDE ? With a proper programmer and atmel studio, you dont need bootloader anymore and could run this chip with a 32, 768khz crystal. This configuration consume almost no current and have a much better clock accuracy

[NNNILabs]

This is really nice! I mean, imagine me wearing a watch I 'made' that says 'NNNI' to school!

[kubaaseph]

You can make this much more power-efficient by decreasing the clock speed

[GRBtutorials]

You don’t really need the SPI pins. You can use a ZIF socket to program the ATmega328 and then solder it. It’d be troublesome to change the code, though.

[dominogolian]

internal 8mhz oscilator isn't very accurate ... i think that every day time will be about 24 minuts shifted... and second think is that when u use a low power modes on atmega and use async timer2 with external 32khz crystal, consuption ist about 1.3uA ... when u use external 32khz oscilator internal clock can be 1Mhz that means Atmega tuns to 1.8V ... I think u should try this things

[mihaelpanjkrc]

That is awesome!
I will try to do it myself

[dabupk]

your idea of using only one button is amazing and how Arduino is working at low voltage

[jabkowy]

To burn 8MHz on used atmega you gotta connect external clock at first ;)

[SverdIndustries]

That's really cool. I just made an atmega328p digital watch as well

[codingmaster]

Keep up the great work ! this helped me so much ! ;)

[lctrstone]

Maybe will be good if you added a Quartz to it to increase the accuracy of time.

[martinhavshjsrensen]

Nice watch! I´m a little of a strange-watch-guy, so it´s right down my alley! Love it! Keep up the good work! :)

[rajeshguptarj]

very
can you make this same watch with hand shake feature instead of push

[aminezitouni]

I like the design of this watch, it looks like we find in the year 3000.

[jyotishmanbharali]

the time drift is caused due the interrupt which is turned on by the arduino ide. you can disable that in order to get very precise timing.

[bajojohn]

I thought about doing something similar with neopixels. Neat idea.

[mesquitamk]

very good .. friend that same BOOTLOADER can be used for atmega8a?

[ViralPatels]

Can you add bluetooth connectivity to this project? We can add more features to it, like adding gyro+acc, It would become a smart watch then...