Electronics > Projects, Designs, and Technical Stuff
The (long) story of the relay clock
Spemo:
--- Quote from: Prehistoricman on January 04, 2020, 10:13:14 pm ---You are nuts! I thought it was crazy when I made an EEPROM programmer on perfboard that has 30-40 wires.
I watched the video and you have the worse case of European number 1s I've ever seen. It's like an M got cut in half.
Anyway they're very cool. The night dimming function is great. I like the orange LED one.
Does it make much more sound when the hours turn over?
Why do you use so many relays? 4 7-segment displays and 1 segment for the seconds surely means you only need 29?
--- End quote ---
Hey, that thing with the number 1 : look closely, number one is just a simple / , the other thing is a 7 ;)
I use this many relays because this clock uses decimal counters - so:
10 digits for 10 seconds (=20 relays + 2 to carry over to the next module)
6 digits for the tens of seconds (=12 + 2 relays)
10 digits for 10 minutes (20 + 2)
6 digits for minutes (12+2)
10 digits for 10 hours (20+2)
and 3 for hours (=6 relays)
In this version I just have no 7 segment displays for the seconds - the circuit still has to be there though. The relays are doing the counting.
Startup: 2 relays
1Hz signal: 2 relays
24 Hours reset: 3 relays
auto dimming at 20:00 : 2 relays
Total: 109 relays
The more it has to turn over at once the louder it gets, so turnover from 19:59 to 20:00 is where you get the most noise. it has to turn over all the modules plus the dimming circuit.
Have a nice day
Daniel
Prehistoricman:
--- Quote from: Spemo on January 04, 2020, 11:22:31 pm ---Hey, that thing with the number 1 : look closely, number one is just a simple / , the other thing is a 7 ;)
--- End quote ---
No, on your handwriting on the underside of the orange LED clock.
I didn't understand that you used relays for counting rather than only switching the LEDs. That makes a lot of sense actually.
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