AbidingOhmsLaw

Decipher #88
deciphered in ⏱️ 2m 8s
⭐⭐⭐⭐⭐
https://decipher.wtf

I have a project that is using a Teensy 4.1, the cheep 5v regulator I was using in the project let the magic smoke out for no good reason. I replaced that but now the Teensy boots and runs for about a min then quits. There is a TLV75733P power IC that is supplying the 3v3 and it gets hot then quits supplying power. Since that IC is $0.46 vs a new Teensy 4.1 ~ $40 I want to try and replace it. I have done a bit of SMD work but not tried to remove a tiny chip with a GND pad before so I’m looking for any tips. The PCB of the Teensy has header pins so I can’t really get good contact to a hot plate to preheat the board.

I installed Bookworm, Docker and Frigate (in docker) on an older i5 Dell with a Coral TPU (USB) and an old GeForce 6600 GPU, the TPU and GPU are for use with Frigate frame processing and video conversion. It was working well for months and then I upset the apple cart by adding whisper and Piper in the docker for my Home Assistant (different server) to use. After I got that all working I noticed that Debian would freeze after several hours of no user use (no one logged in either on the console or SSH). This seems to happen now even after I removed the Piper and whisper containers. Thinking it might be a suspend issue I masked all the suspend points and set the power profile to “never” but that did not help. Looking at journalctl does not show anything I can see, it seems to just stop logging at the freeze point, interestingly the ethernet jack still shows activity but no ping :(

What would be the next troubleshooting steps to find what is causing the freeze?

I discovered some items on clearance at Home Depot, a Wyze Outdoor duplex plug and a Defiant smart plug. Did a little research on the modules I found inside and was pleased that both used esp32 microcontrollers. I got both disassembled, soldered up, and got to work flashing ESPHome, The Wyze was went well and is now integrated into my HA. Unfortunately the Defiant smart plug was defiant and when hooked up to do the flash I got a “Download mode disabled, reset with GPIO0 high.” Researching that I found that newer esp32 chips have a “Secure boot” fuse that once set disables future firmware updates from the UART. Not sure yet if there is an OTA exploit like the with BK7321 toya chips, but i’m not hopefull. If anyone knows of something let me know.

I have an old Raspberry Pi B+ (cica 2015) it came out after the Pi 1s and before the Pi 2s. I would like to use it with a Pi 7” touchscreen to make a touch screen dashboard for my HA. I been trying different solutions I’ve found but most of them make use of chromium in kiosk mode, chromium won’t run on the B+ 🙁. I found several other older solutions but with all of them I’ve run into issues like files can’t be found anymore or have dependencies on libraries that can no longer be found like kweb kiosk browser or use things that are no longer supported by the OS like OTX.

Anyone using a B+ for an HA dashboard? Got any tips?

I’ve had this iseebell video doorbell for a few years and a year or so ago their web site disappeared as well as the app from the mobile stores. I still have the app on my phone and it does still work but, since the company seems now be defunct I expect that the app will cease working soon. I’m not thrilled that there is an app and need to proxy through a external server anyway and I would like to add the streams to my Friget/HA setup. Does anyone have any info on the iseebell streams, alternate firmwares, hardware hacks, etc.?