TiaCSys / CoffeeCaller - History

Merge branch 'askz/fix-levelshifter'

Signed-off-by: Andreas Kurz <info@akurz.net>

fix: level in levelshifter too low on high frequencies

The pull-up resistor to 5V was too big causing the levels not raising
high enough to provide a good signal for the WS2812 RGB LEDs. This is
fixed by choosing a smaller resistor and removing the current limiter
from the microcontroller to the source of the levelshifter's MOSFET.

Signed-off-by: Andreas Kurz <info@akurz.net>

Merge branch 'askz/add-license'

Signed-off-by: Andreas Kurz <info@akurz.net>

feat: add license to repo

Signed-off-by: Andreas Kurz <info@akurz.net>

Merge branch 'askz/corrections'

Signed-off-by: Andreas Kurz <info@akurz.net>

chore: redraw levelshifting circuit

No changes in PCB

chore: increase LED resistor to 5k1

The power and normal GPIO driven LEDs are quite bright. So the resistor
is increased to 5k1 as this type is already in use on the board.

chore: use more correct trace width for RF

For a two layer board the correct trace width for 50 Ohms should be
around 2,7 mm. This is quite thick and doesn't connect well to the
existing pads. Therefore it's reduced to 1,7 mm as mentioned in the
datasheet for the antenna.

Also a test point is added to connect analyzers directly to the RF
output.