I seem to be having issues with a Monochron similar to some previously posted. It passes the initial power supply and no-display "beep" tests. The clock boots, can be set, runs for a while (minutes to overnight), then the display freezes/freaks out. I can reset it by pulling and replacing the power. Alarm & 12/24hr settings are preserved on restart, time and date are not (implying an RTC issue?). Testing the coin cell gives 3.3V so I can rule that out. I'm tempted to wipe down the board to remove flux & remelt joints near the RTC.
If need be, I'll post better photos later; the phone camera seems to want to make everything smudgy and washed-out.
Yes, C2 should be lying flat. Also, that's a replacement LED for similar reasons. :/
Just noticed R10 is missing (confessional debugging); will investigate the significance of that ASAP.
Thanks much,
-- Bob
PS: This is not my week; software issues drove me to hardware. I expect the clock problems to be minor setbacks, though it's part of a long string of failure. Most upsetting was the build process for the IoT Printer kit, but that's a subject for another post (short answer: soldering wire to header pins is a hack, a particularly BANNED and frustrating one to spring on someone building a kit. Zero fun.)
Monochron working ... for a while
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- adafruit_support_bill
- Posts: 88087
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Re: Monochron working ... for a while
Hi Bob,
R10 is not used, so don't worry about that. Can't really see much detail in the soldering. If you can get some better photos, that would help. A little larger would be good too. About 800x600 should be fine.
I have heard of crystal oscillators misbehaving due to residual carbonized solder flux, but yours doesn't look all that bad from what I can see from here.
R10 is not used, so don't worry about that. Can't really see much detail in the soldering. If you can get some better photos, that would help. A little larger would be good too. About 800x600 should be fine.
I have heard of crystal oscillators misbehaving due to residual carbonized solder flux, but yours doesn't look all that bad from what I can see from here.
- at2marty
- Posts: 46
- Joined: Sun Mar 27, 2011 1:15 pm
Re: Monochron working ... for a while
I know this is off topic, but I'm curious... In the first picture I noticed that there is an R2' and an R2, the same with IC2' and IC2. What is the difference and why are they labeled that way?
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- Posts: 66
- Joined: Thu Jul 12, 2012 5:19 pm
Re: Monochron working ... for a while
The answers are in the instructions, at http://www.ladyada.net/make/monochron/solder.htmlat2marty wrote:What is the difference and why are they labeled that way?
Just search for IC2 and R2
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