fallberg / mysensorsnode Goto Github PK
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License: Other
My personal MySensors Node sketches and HW designs
License: Other
Just like the BOX-2252 layout, just with more space to spare.
The 5V regulator does not work properly when cascaded with the 3.3v regulator.
It should not be mounted on this board, or the board should be rewired to connect the 5V regulator directly to +BATT.
Dependencies to the MySensors libraries are acceptable.
This may lead to undetermined behavior on some SPI devices.
Schematic parts are not fully updated yet with sourcing details
Low-cost 5x5cm layout is needed. It will not carry all battery options like the other layouts do due to size constraints.
Output should be in a format that online retailers are capable of importing.
If some of the selected retailers capable of importing BOM cannot accept a format with other retailers present, there will be multiple BOMs where only the primary source retailer will be included in the BOM. The retailer in question will be present in the BOM filename to clarify this.
It is recommended to add one or two additional capacitors to suppress input noise (~47 to ~470uF).
The layout of CON1 is incorrect with respect to normal battery connectors so battery polarity will be reversed. Do NOT connect a battery with JST connector to this board (Rev 1.0).
That means it could start up in "off" state which mean that if battery level is too high (>4.1V) SPI flash could fry. If battery level is too low (<1.8V), MCU might not start in order to enable the regulator. A workaround if this situation is undesirable is to solder a pull-up resistor between REG_BYPASS and +BATT signals.
This can wait until all boards are laid out.
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