@sxdemon Yeah. Reasonable time keeping requires a clock source with sub-100ppm accuracy. Your typical quartz crystal is rated for 20ppm, where your typical resistor or capacitor is rated for 5-10%, or 50,000-100,000ppm. You can improve the 20ppm by controlling the temperature, but to improve that by much more than one or two orders of magnitude requires something better than quartz, a la atomic time-bases.
@PhirePhly2007 Awesome, I needed something like this for my next project.. I already build a unrealible Binary clock with some Binary counter, 555 timer and logic gates. After one hour I had a 15 minutes error haha, and when it was working.
Now I'm going to do a working and realible one with an Arduino :p
@sxdemon Yeah. Reasonable time keeping requires a clock source with sub-100ppm accuracy. Your typical quartz crystal is rated for 20ppm, where your typical resistor or capacitor is rated for 5-10%, or 50,000-100,000ppm. You can improve the 20ppm by controlling the temperature, but to improve that by much more than one or two orders of magnitude requires something better than quartz, a la atomic time-bases.
PhirePhly2007 1 year ago
@PhirePhly2007 Awesome, I needed something like this for my next project.. I already build a unrealible Binary clock with some Binary counter, 555 timer and logic gates. After one hour I had a 15 minutes error haha, and when it was working.
Now I'm going to do a working and realible one with an Arduino :p
sxdemon 1 year ago
@sxdemon It's a DS1307 chip, but really any I2C RTC would work... 1307, 1330, 3231, 3232, etc.
PhirePhly2007 1 year ago