Ok, makes sense. I'll do that once the account approval goes through:
" Your account is pending approval from your GitLab administrator and hence blocked. Please contact your GitLab administrator if you think this is an error."
I've written a register dump code for the BQ24297 power management chip. I wanted to see why the charging fault is flashing and to gain general understanding of the chip. The fault state is reported at the end of the output.
Note that there is a similar program for the BQ27421 fuel guage...
On the schematics there is a INA231YFF chip to monitor the current going into the modem with I2C address 0x4F.
This can give you the current used by the modem by typing "sensors" at the terminal. Maybe that can give some clues?
@pyra:~$ sensors
ina231-i2c-1-4f
Adapter: OMAP I2C adapter
in0...
The last couple of days I've used the Pyra to slice and 3D print components of the MPCNC Primo. Maybe one day I'll be able to mill case parts for the pyra from aluminium, but that will be at least 6 months off.
* MPCNC = Mostly Printed CNC
I'm using PrusaSlicer-2.3.0 compiled for armhf. This...
I see it as more of a subscription service at the rate of 700€ / 2months™ = 15€ per month. I've got a spare prototype case, and a 3D printer if needed.
In case its of help to someone, here's how I let the blue smoke out of my Pyra and put it back in again. The schematics and datasheets being open source means I can write up the experience from the now repaired Pyra.
As you may have read, I've been adding heatsinks and cold fingers to my Pyra...
In schematic order (v20190717, see replies below):
Nubs (x2)
AMS N50P105 - Miniature Joystick Modules
=> contains AMS AS5013 - Hall Effect XY Linear Position Sensor
MLX90248ESE-EBA-000-SP - Display Lid Sensor Hall Effect Switch
V5.5MLA0603NT - 8 x Transient voltage suppressor varistors on...
Does anyone have a directory full of datasheets for the various chips used in the Pyra? I've been reading up on a few things but keep having to search for the datasheets. I expect someone has got all these in one place already though.
If not, is it ok if I create a list of datasheet links...
Something like this? I've attached a bigger aluminium heat sink to the original heat spreader that goes to the CPU chips and usb ports. Its in good contact with both usb ports.
The bottom of the CPU board has the cold finger going to the side of the case with a low profile NVMe heatsink...
Yes, keep in mind that I've bought into the Pyra because I love taking things apart for fun to understand how it works. The thermal design got my interest first as I often do thermal calculations at work.
Id rather try to help out software / kernel but that's a bigger learning curve for me.
Going back to the original thermal design but adding heat sink compound between the heat spreader and the motherboard is messy and didnt help with CPU throttling. It doesn't get any more heat to the keyboard than the original heat spreader contact with the motherboard. I think the keymat must...
The heat path to the keyboard is not as easy as to the battery because the flat bottom of the CPU board is facing the battery, but there's the motherboard PCB and keymat out to the keyboard side
Can we get more conduction to the keyboard side by filling the gap above the CPU chips with...
Yeah, I hope evildragon orders a few spare cases as chopping them up is a rush!
About putting a bigger heat sink on the cpu to usb heat path: I think we need to work out the thermal resistances for the original cpu board heat spreader and the thermal resistance for the heat sink.....
The cpu...
The priority for me is to get an air gap between the CPU board and the battery into the case mold. This can then be covered over with the existing sticker and optionally packed with a very open insulating foam. I think this helps with charging the pyra when in use as the battery runs 4 or 5C...
The safety of this is a good point. The CPU reaches 90C and can brand ARM on my tongue if I lick it, but this is for a tiny surface area.
Im trying to get an area outside of the case as hot as possible and the hottest external temperature I've got so far is ~40C. This is comfortable.
If we...
The small 10mm high heat sink, now with tape on, is still hot to the touch despite the tape. If it gives a stable pyra that charges whilst coding / browsing then its working fine.
Its been charging fine for the last hour at 1Amp whilst browsing. The battery is holding at 43C as set by evil...
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