Now I know why I2C was not working in my nixie clock. Today I got an arduino nano from helsinki hacklab, and started to troubleshoot my circuit. Oddly RTC worked when I tried it in breadboard, and also in clock’s motherboard, when nothing else were connected. Also noticed that when nixie driverboard was connected, both of the i2c lines had weird resistance to 5v and ground. I once again removed driver board from case and measured. It was ok, of course. I didn’t even tough about cabling <.< Read More …
Tag: i2c
Flashing monitor EDID
Yesterday I got a HD4850 card from post and happily installed it to my desktop computer. I noticed that my 15″ secondary monitor was not detected, but I ignored it until today. Working with two monitor is so much easier and faster, so I started to investigate problem. Read More …
Why u no work >:C
So the Nixie-clock isn’t working,.I don’t know why, but the AVR hangs when an I2C routine starts. RTC and I/O extender ic’s should be alright, because they are brand new from ESD tube. And yes, the pull-up resistors are also connected rightly and are 4,7k, which worked on the breadboard perfectly. I’m out of ideas how to make it work. My last resort is to try new AVR when it comes from ebay. If it will not work then, I don’t want to continue whole project <.<
Also, my 8800GT GPU card died today. 
Yes, something went horribly wrong and now it crashes every 5 minutes. Last spring I did reflow soldering because memory IC’s were detached from PCB. Maybe it’s now time to say good bye to an old friend and let it rest in peace. I will buy used 4850 for 50€ so wish me luck!
There’s something good, I found a broken and wet TravelMate 7520G 17″ laptop from the garbage one rainy day. It had broken LCD inverter cable which was an easy fix, and some coke on keyboard. I dried it, washed mobo with G20 dry cleaner (amazing stuff), changed the bios battery and it started to work \o/. Some days later i found another ACER 17″ with broken integrated GPU, which had same keyboard, so now I have a working high performance laptop (yeah I know, over 5 years old amd X2 64 TL-58, HD2400XT, 2GB PC2-6400 and 2x 160GiB WD blues is not even near high performance by todays standard(I could probably get faster netbook or tablet), but more than enough for me).