cuicocha

My project uses a Sparkfun Artemis, along with peripherals connected by I2C (LED Stick, GPS, and I2C mulitplexer with a few sensors). The system works at first, but after a variable amount of time operating (seconds to hours, depending on how the connections are made), all I2C communication stops. The code keeps running but fails to change the LED display or collect info from the sensors or GPS.

Upon a non-power-cycle reset of the Artemis, sometimes (maybe always) the I2C components remain unresponsive (the .begin() commands fail). So, the watchdog timer I've already implemented won't solve the problem. O

I'm thinking of something like what gets used in mains wiring (wire nut or wago), but I don't know how available or recommended those are for narrow wires (AWG 22-28). Ideally, it would be somewhat resistant to vibration, but it doesn't need to be as rugged as soldered connections.

I supervise a team of student lab employees; they graduate and leave after a couple years so there's a lot of turnover and loss of knowledge. So, it's really important for me to be able to teach inexperienced people to do good work consistently.

Most recently, an employee overtightened the mounting screws for a batch of PCBs (screw tightness is not really covered by current training). This mounting screws go between two PCBs with a plastic spacer in the middle, and screw into a nut on the bottom side of the bottom board. Overtightening meant that the screw head abraded the soldermask on the top of the top board and the nut abraded the soldermask on the bottom of the bottom board, exposing b

Along with how much I actually owe in taxes, I'd like to find out things like whether my deductions exceed the standard deduction, and what credits I could benefit from.

I understand that the inputs will just be estimates without a W2, etc.

I own a house and have a fixed-rate mortgage at 4.375%. Virtually my remaining wealth is in low-fee stock funds (both taxable and retirement). In my late 30s, I feel old enough that I should start having some significant amount of bonds too.

I had the idea that if I pay an extra $1k on my mortgage this year, my future payments will have $45/yr less interest, meaning that my equity will increase by $45/yr until the mortgage ends (and the mortgage will end earlier). Seems like it has the predictability benefit and low return downside of a bond, just with less liquidity. Further, suppose I re-cast the loan (lump-sum payment to reduce the monthly payment while keeping it a 30-year loan)--then I

My team uses a shared department CentOS server for most of our data work, and for reasons, we don't have easy access to a sysadmin with root permissions. A typical workflow is that lab techs collect and upload data to folders I own, and I handle data organization (including moving and renaming files, and changing permissions of primary data to read-only for safety). Linux/Mac users normally upload data using rsync -avz; Windows users use Moba which I think uses SFTP protocol.

The problem is that when a user uploads a file, it automatically belongs to them. I normally have them change the permissions to 777 so I can at least move and rename files (which is an annoyance, as most lab techs are