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This resolves ERC issues. The ERC complains that an power input is not
fed by a power output if there is a component like a ferrite bead or 0
Ohm resistor between the two.
The `PWR_FLAG` tells the ERC that it was explicitly checked that this is
not a mistake.
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The internal pull-up resistor of the STM32 can be used.
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It is hard to say if these are necessary. For sure they are not
necessary anymore when the device is assembled inside the case. Thus the
risk is taken to provide some more space and reduce assembly effort.
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This chip provides a globally unique EUI-48 MAC address. This address
will be printed on the device enclosure.
The IPv6 link-local address of the device can be directly calculated
from this MAC address. Thus a commissioning software can directly access
the device when the user types in this MAC address without any discovery
protocol.
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They are required to drive the transistors properly.
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The idea of the red LED used to be to indicate power delivery to the
board independent of firmware.
While this is good to know it adds the constraint that even without
firmware the LED should light up. Furthermore it should stop lighting up
when the firmware takes over the blinking with different colors. This
was solved with a NOT gate.
This adds more parts to the assembly at the cost of rare space. To
reduce space consumption this feature is removed.
The effect is that the user cannot distinguish anymore if the board has
an issue with power supply or with not running firmware. This is
acceptable because the user cannot do anything about both issues.
Developers have the chance to e.g. connect the UART to validate if the
firmware is running.
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It is required to save as much place as possible on the PCB. There used
to be these reset methods:
- JTAG reset
- button reset
- power-cycle
- firmware-based reset
Taking away the button reset option is reasonable since for the
development and production use case there are still enough options.
Developers should use the JTAG reset or power-cycle and users will
anyway use firmware-based resets (e.g. during updates) or power-cycles
which is anyway most intuitive to users.
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Now there are 6 locations for 3 zero Ohm resistors. Three places to
power by PoE and three to power externally. Never all of them should be
placed.
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The status LED should always display on color either constantly on or
blinking.
To make sure even without firmware this is given a NOT gate is added.
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This is more space efficient and makes it easier to label the LEDs.
There is just one "status LED" lighting up in different colors compared
to one "update LED", "power LED" and "activity LED".
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This table is the result of running:
./tools/resistor_selector.py --output pcb/versions.tsv
Additionally the table was manually edited. The first column now
contains version strings to reserve resistor combinations.
This is used to keep track of existing versions, their resistor values
and related ADC values. The latter will be added to the firmware too.
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Making them active-low makes it easier to reset the MCU. For the wipe
functionality it does not make a role since it will simply be defined in
Devicetree.
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This voltage divider provides an analog voltage between GND and +3.3V to
indicate which hardware revision this board is.
Thus the same firmware image can be used on multiple PCB versions
compensating the hardware differences in software.
The resistor combinations are calculated by
`tools/resistory_selector.py`.
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This reduces the electrical contacts which is possible and necessary
because of size constraints.
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These files seem to be present since KiCad 9.0 and should not be tracked
with version control.
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This can be used to order the PCB depending on the manufacturers
software capabilities.
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Using the installation step to copy selected artifacts into one folder
was anyway a hack.
This commit shows that the complexity can be reduced by adding copy
targets. The `build/artifacts` folder contains the selected artifacts,
they are always up to date, the user does not have to call the install
step separately and the target definitions do not require
install-related keyword arguments.
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A static site generator is currently not really required. A static
index.html is currently sufficient.
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This makes the build system code way less hacky and more modular.
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These important design files should be deployed with the website.
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This allows to install the PCB-related files easier to the website which
is built with Meson.
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KiCad based on the not committed user settings saves backups in
iot-contact-backups. Excluding those backups from Git is important to
not double-track changes.
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This makes it easier to keep the descriptions and the text inside the
schematic in sync.
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