valor Louis Rossmann has some videos where you can see how makes it look really easy 🙂 Do you have hot air station?
valor You could also clean the IMU pads, put some solderpaste on the pads and reflow the whole board again.
Dodo2207 Here is my finished minihub: It took me much time to solder the connectors on it but ithink it turns out well. I will test it tomorrow and hopefully it will work.
valor Dodo2207 From the looks of it, you have some blobs shorting the some pins on the U5. Can you recheck that (im replying from my phone) Are those shiny dots the solder balls all over the pcb? You might have to clean your board with some flux remover and ultrasound. I use MC1 Break and Clutch cleaner which costs fractions of a dedicated fluxcleaner and does the same job.
daylanKifky Quick note: It's ok to clean the Hub with ultrasound but it might destroy the IMU if you do it with the KCeptor. We found this out the hard way: https://forum.chordata.cc/d/63-calibration-issues/52
valor daylanKifky yea it's a good reminder. Most MEMS devices might get destroyed by cheap ultrasonic baths. Higher frequency cleaners with sweep function will work tho.
Dodo2207 Thank you for your tips 😁👍 Ill check my U5 but it will take a bit to clean my board bc I need to buy it first. How nesessary is it to remove little blobballs from the board if they dont connect on any pads? I dont have a ultrasound cleaner
valor Dodo2207 I'd say, it's an extremely good idea to remove the residue solder balls from the board, even if they appear to be "minding their own business". What I learnt the hard way is, that they have a life..and they tend to relocate themselves right in between the critical pins of the ICs. You can also use IPA and brush the board off with a (new) toothbrush.
Dodo2207 Thanks you for all you tips 👍 Ill clean it first and try to remove the flux and the soldering balls. The test is than next week after cleaning. Hopefully I get the cleabing stuff fast.
Dodo2207 Wait you mean I can clean the board with Indian Pale Ale beer to remove flux and soldering balls?
valor Dodo2207 that will be a waste of a perfectly fine beer 🙂 Isopropyl alcohol (2-propanol) is a cheaper option
Dodo2207 And how do I clean with MC1 Brake and Clutch cleaner? Do I need to mix both or spray MC1 Brake first on the board and than clutch cleaner?
valor SDG recently covered this in a video This particular Break Cleaner has always worked for me. It's pressurized and sometimes that alone is enough to clean the boards off, especially if you come back to the same board after a few minutes of initial spraying.
Dodo2207 I orderd MC1 Breakcleaner. It will arrives between 13-16 May. Ill try in the maintime to create some more Kceptors to solder
Dodo2207 After some trying my minihub is working 💪 The raspberry find it. The next step is to make the sensors work too. Ill test it later and update this discussion
Dodo2207 I calibrated my first sensor. My next test is with Blender the next days. I'll build couple more sensors and another hub the next week.
