I have a question about the DS1302... What can cause that my Arduino-based clock with that IC skews when it is powered from its internal battery?
I have built a timer circuit, which displays the time and temperature. It has an external power adapter, and i have connected a battery to DS1302, to preserve time when external power is unplugged.
Now, when powered from wall socket, the time is accurate, but when i plug it out, and leave the DS1302 to run from its own battery, the clock skews (forward, or backwards!).
Can anyone give a point, about what can cause this?
Some minutes. But randomly forward, and backwards. And as i observed, only when there is no external power.
External power and DS1302's CR2032 battery (brand new) haven't got any common points except common ground
Not per day. It rns normally when powered from PSU, but when i pull out, and leave it for a couple of minutes, or half an hour, its time differs from any other clocks i have. (Phone, wall clock, PC clock...)
Will be easy to locate the rrror if the skew were constant from every power source.
DS1302's backup battery is brand nev... It's a CR2032.
Hmm, Radio Shack (AKA TAndy) died a miserable death in this country, and its scavenger, Dick Smith Electronics, no longer sells electronic parts as such but does sell Iphone cases.
I wonder - does Radio Shack still count as an electronics parts shop?