This clock is my submission to Hackaday and Digikey’s 555 Timer Contest this year. All the details are on my project page on Hackaday here [https://hackaday.io/project/183327-mcu-less-ds1302-calendar-clock](https://hackaday.io/project/183327-mcu-less-ds1302-calendar-clock)
TLDR: I hate having to set the time of my logic clock every time I unplugged it, so having the RTC chip to keep the time running is the best logical (pun intended?) way to go. But what’s the fun in using a microcontroller, right? That’s already all over the internet.
At first, I thought of using DS3231 I2C RTC, but I2C is apparently too hard to do, so I switched to DS1302 which uses SPI. The SPI bus uses a circular shift register topology which is much easier to implement with logic chips. Unfortunately, DS1302 shares data I/O pins so it starts to get complicated, but here we go! A battery-backed RTC calendar clock that doesn’t use any microcontroller.
Noted that I still use Arduino to set the time. At present, the logic circuit could only get the time out, but not set it.
It uses 7-segment to output the data for now, but I already have nixie tubes in hand. I will post a new update here when that is done.
Nice ! I was making my own and this make me realize that clocks made excellent projects since their task is really simple, require basic math, way of getting regular impulses(for time measurements), and displaying few digits (+ setting time). And there’s SO MANY ways of doing each of those things.
I made my clock with Attiny13a counting impulses from board token from broken “analogue clock” (u know electronic but uses servo to move sticks that point at numbers) clock so kinda a opposite of your. except i also used 7 seg. LED but i got mine from microwave oven control board
And yea for me resting after power off is also pain in the rear but i plan to make “UPS” like circuit with li-po battery.
Hello.
This clock is my submission to Hackaday and Digikey’s 555 Timer Contest this year. All the details are on my project page on Hackaday here [https://hackaday.io/project/183327-mcu-less-ds1302-calendar-clock](https://hackaday.io/project/183327-mcu-less-ds1302-calendar-clock)
TLDR: I hate having to set the time of my logic clock every time I unplugged it, so having the RTC chip to keep the time running is the best logical (pun intended?) way to go. But what’s the fun in using a microcontroller, right? That’s already all over the internet.
At first, I thought of using DS3231 I2C RTC, but I2C is apparently too hard to do, so I switched to DS1302 which uses SPI. The SPI bus uses a circular shift register topology which is much easier to implement with logic chips. Unfortunately, DS1302 shares data I/O pins so it starts to get complicated, but here we go! A battery-backed RTC calendar clock that doesn’t use any microcontroller.
Noted that I still use Arduino to set the time. At present, the logic circuit could only get the time out, but not set it.
It uses 7-segment to output the data for now, but I already have nixie tubes in hand. I will post a new update here when that is done.
Github repos are [https://github.com/Sirawit7205/logic-ds1302](https://github.com/Sirawit7205/logic-ds1302) and [https://github.com/Sirawit7205/logic-ds1302-segment-output](https://github.com/Sirawit7205/logic-ds1302-segment-output) if you are interested.
Thank you.
Cut the blue, no wait, the red wire!
Looks retro cool! Definitely worthy of it’s own stand in the corner of the living room.
It’s the bomb. I mean it looks like one so why not.
Nice ! I was making my own and this make me realize that clocks made excellent projects since their task is really simple, require basic math, way of getting regular impulses(for time measurements), and displaying few digits (+ setting time). And there’s SO MANY ways of doing each of those things.
I made my clock with Attiny13a counting impulses from board token from broken “analogue clock” (u know electronic but uses servo to move sticks that point at numbers) clock so kinda a opposite of your. except i also used 7 seg. LED but i got mine from microwave oven control board
And yea for me resting after power off is also pain in the rear but i plan to make “UPS” like circuit with li-po battery.
PS. Here is github if you interested [https://github.com/radekrudak/A-TinyClock](https://github.com/radekrudak/A-TinyClock)
I wanted to make post on this subredit but it endup removed.
Chip shortage is that bad for you? Haha
This is great! Work of art, too.
What do you use as a timing reference? A crystal?
EDIT: I think I see the crystal.
At that point isn’t it a lot more work to add everything to interface with the IC than it is to just do those functions in hardware?
Does it do more than add an oscillator and a counter?
I always rip them off. Should I be leaving the plastic on my seven segment displays?
That looks excellent. Love the looks of the partly metal leds, they look like ancient soviet artefacts.
Also, what are the chips in blue case?
I’m thinking about what career to study and I like that, what should I study?
We just need a car that has a flux something, something.