Building a Digital Clock with Arduino Uno Rev4 WiFi's RTC and LED Matrix 

This is the second project I've seen using the R4 . The first one showed access to I believe Wifi with a phone. This one shows more, such as RTC use. Little by little people are doing projects. Each one adds a sketch which expands our tools. Thanks.

This is cool to the max! I love it, have it installed on my R-4 right now. I have ordered a new RTC battery for an old DELL I am fixing up for my daughter to use to play pinball games on using an emulator, when I ordered the battery, I ordered 4 as I always order a few extra to save on shipping and stash a few extras in a drawer. On of them is going to hook to the RTC battery pin on the Uno R4 to keep the clock time up when I disconnect it from the power. I have dozens of old home built digital clocks around the house, this one will make a nice centerpiece for the clock shelf which is next to my AM transistor radio shelf containing all the old Transistors I got off Ebay and rebuilt to working order using Caps I got in a box of misc caps from electronic gold mine out of Arizona.

Arduino needs Dump the 12x8 LED Matrix to have an OLED Display on the up an coming (REV-5) Just a suggestion (And Request) if Arduino is reading this.. 👍👍👍👍😎.. Thanks for sharing your "Ideas"

very good job

In the code, why don't you go "secondsON_OFF = 1-secondsON_OFF ;" Instead of "secondsON_OFF ? secondsON_OFF = 0 : secondsON_OFF = 1;" The later seems less efficient (a bit) ? The ?: construct is cute but not always the best option ! Or am I missing something ? Thanks a lot ! I've put the blinking colon at the right of the hour instead of left of seconds ! Can I stop the little yellow led blinking on the board each time the display changes ?

Excellent tutorial congratulation, is it possible to connect a buffer battery and keep the time even when turned off ?

Freue mich schon auf Teil2 mit NTP-Server. Wann wird denn der Teil2 erscheinen? Viele Grüße

In case I run out of power, how can I don't lose date and time? How do I connect a external battery? Thanks.

Hello, nice project. Where can I find the description of the project and the code including the NTP server?

how to change the time on this

The RTC in the Uno R4 is so inaccurate it is not useable

Interesting that it takes the time at compilation and not reset. I would have thought that when reset it would get the current time off the PC again.

About 13:43: If you just use an bool instead of a byte, then you even don't need an if-command nor the binary conditional assignment operator.

thanks for your video. I have a question, your Arduino IDE install on Windows 11 or 7? I can't make UNO connected with Windows 7 because lack of driver, even i try to find althrough internet. If you have driver, could you share?

Is there a 12 hour way of writing this, rather then just 24 hour?

Splendid video. I really like the various iterations you used to explain the process involved in obtaining the time in different formats and displaying it. Most of all you kept it simple and concise. Thank you for sharing. ❤

... and I thought setting the clock on my VCR was complicated ... (What's a VCR, Daddy? - Later, Dear.)

About 04:28: hmm.. isn't it better to just add a delay(1000) instead of the if-command, because in that case the CPU has maybe less to do and can save some power (if the delay function is coded good and/or compiled well by the compiler; i didn't checked that).

When you write: `secondsON_OFF ? secondsON_OFF = 1 : secondsON_OFF = 0;` That is a less conventional use of the ternary operator. Typically we return a value based on a condition, not use it rather for its side effects. Better alternatives are: 1. ` secondsON_OFF = 1 - secondsON_OFF;` 2. `secondsON_OFF = secondsON_OFF ? 0 : 1;` Remember, too smart code is not clean code. Clean code is what you can easily understand.

Is it possible to connect a MAX7219 8x8 LED matrix to Arduino® UNO R4 WiFi to show the clock?

I keep getting #include error

Running Light

theres a pin for powering the RTC should have mentioned that

great project

Hello Mario, can you build an LED arcade button into an enclosure so that any time the button is pressed it lights up and makes a buzzing noise?

Nice work

Hallo, ghibt es schon einen Part 2 mit NTP-Lösung? VG ULLI

Pretty interesting, as always.

The RTC is very inaccurate, 1 second per minute advance

Will there be a part 2?

Hallo, ich bekomme eine Fehlermeldung beim Kompellieren in der Zeile: getcurTime(timeStamp,&dayofWeek,&month,&dayofMon,&hours,&minutes,&seconds,&year); Meldung: Compilation error: 'getcurTime' was not declared in this scope