Hey jplgis,
Strange behavior indeed. I vaguely remember seeing a similar problem with older firmware version. To start with, we’ve seen some issues related to the SD cards that BathyLogger includes in their kit. If it has an SD card, remove it (bonus points if you insert it into your computer and report back about what’s on it / what format it is! We haven’t been able to get ahold of one to figure out what’s going on.) There is a chance that removing/replacing that SD card will fix all issues.
There are three possible ways to force a reset (I would try them in the order I have listed):
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Serial Terminal
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Hardware power button
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Disconnect battery
Serial Terminal: connect the Facet to your computer via USB, open a serial terminal, and see if you can connect to it that way. If you can get a serial connection, you can force a reboot.
Instructions for how to get a serial terminal running: https://docs.sparkfun.com/SparkFun_RTK_ … nal-window
Hardware power button: It is located inside the housing on the display board, just behind where the power button sits. The electronics inside are robust (you won’t damage the electronics by opening the unit), but the ribbon cables are a bit fragile. All you need is a skinny, long neck Phillips head screwdriver (I think it’s a PH0 or PH1 size, but don’t hold me to that). Gently work the black silicone sock off of the top, remove the four screws, then apply light pulling pressure on the two halves of the clamshell, and it will pivot at the front of the device and open. I’m not sure what else BathyLogger does to these units as far as sealant goes, so there may be extra steps that you can ask them about. Once the unit is open, you’ll see a small brass nub sticking out of the display board towards in interior of the device, in-line with the external power button. Use a finger or something else non-conductive to give it a light press; it should give a little click in response. If this doesn’t have an effect, press and hold for about 6 seconds. If this solves your problem, you likely have a bad power button; if that is the case, reach out to BathyLogger for replacement.
Disconnect battery: As a last resort the battery can be unplugged. This requires disassembling all the big components; I think it took me about 15 minutes the first time I tried it. It is not super difficult, just taking out screws, disconnecting ribbon cables (make sure to flip up the black plastic lock on the backside of the connectors; the ribbon cable will be completely loose when those are flipped up), and setting components aside as you disassemble (there is no need to remove the screen or display board, just disconnect the black ribbon cable going to it). Excluding the battery disconnect, nothing should take much force. The last thing you’ll have access to is the battery connection to the receiver board. That connector takes more muscle to remove than anything else (by design!). I’d recommend some serrated needle nose pliers; pinch the male end of the connector going to the battery, gently wiggle it while pulling, it’ll come loose after a second or two.
Pictures and documentation about what each thing is, how it connects, etc, can be found here: https://learn.sparkfun.com/tutorials/sp … e-assembly
