Hi,
I'm assembling the ice tube clock. I have got to the point where I have placed the 32.768 kHz clock crystal plus capacitors. I have done that, but notice that I no longer get the beep on power up. Looking at the clock pins on the Atmel processor chip (pins 9 and 10), with a scope, I see the correct frequency, but the voltage swing is only 100mV instead of on the order of 5V as required by the chip spec. I have gone through the Ice Tube troubleshooting checklist on this site, and verified that the 5V supply is working etc. I am wondering if somehow the AVR controller is driving the pins as output instead of input. Is there a quick way to verify that the chip is still running the correct program? I am not familiar with AVR programming, but could dive into it if necessary.
Thanks
Jim
icetube clock circuit
Moderators: adafruit_support_bill, adafruit
Please be positive and constructive with your questions and comments.
- adafruit_support_bill
- Posts: 88154
- Joined: Sat Feb 07, 2009 10:11 am
Re: icetube clock circuit
If the clock was beeping on power-up it is most likely correctly programmed. Double check the capacitor values and soldering in the area of the oscillator. If you post photos of both sides of the board we'll have a look too.
-
- Posts: 4
- Joined: Wed May 09, 2012 12:49 pm
Re: icetube clock circuit
I double checked, and took photos of both sides of the board (attached). I will send 3 more photos in another post.
-Jim
-Jim
- Attachments
-
- DSC_0418.jpg (293.66 KiB) Viewed 1438 times
-
- DSC_0419.jpg (285.82 KiB) Viewed 1438 times
-
- DSC_0424.jpg (265.77 KiB) Viewed 1438 times
-
- Posts: 4
- Joined: Wed May 09, 2012 12:49 pm
Re: icetube clock circuit
Here are the last 3 photos. Please have look -
Thanks -
Jim
Thanks -
Jim
- Attachments
-
- DSC_0352.jpg (627.9 KiB) Viewed 1438 times
-
- DSC_0354.jpg (352.69 KiB) Viewed 1438 times
-
- DSC_0355.jpg (184.66 KiB) Viewed 1438 times
- adafruit_support_bill
- Posts: 88154
- Joined: Sat Feb 07, 2009 10:11 am
Re: icetube clock circuit
Just to be clear. You did get a beep on power up at one point, but you are not getting it anymore?
The solder joints on the crystal leads, and some of the capacitor leads as well look as if they may not have properly wetted the solder pad. This can result in intermittent conductivity. Re-touch these joints to look like the diagram below:
The solder joints on the crystal leads, and some of the capacitor leads as well look as if they may not have properly wetted the solder pad. This can result in intermittent conductivity. Re-touch these joints to look like the diagram below:
- Attachments
-
- Solder Joint.gif (7.78 KiB) Viewed 1433 times
-
- Posts: 4
- Joined: Wed May 09, 2012 12:49 pm
Re: icetube clock circuit
Yes I was getting the power-on beep, but not anymore.
I will retouch the solder joints.
Thanks,
Jim
I will retouch the solder joints.
Thanks,
Jim
Please be positive and constructive with your questions and comments.