fwatch issueshttps://ohwr.org/project/f-watch/issues2019-02-12T11:18:40Zhttps://ohwr.org/project/f-watch/issues/1Add ohwr.org on the case2019-02-12T11:18:40ZMaciej LipinskiAdd ohwr.org on the caseadd "ohwr.org" on the case cover, next to the ohwr logoMaciej LipinskiMaciej Lipinskihttps://ohwr.org/project/f-watch/issues/2PWM outputs2019-02-12T11:18:40ZMaciej SumiĆskiPWM outputsIf PWM outputs for backlight & buzzer were connected to LETIM0\_OUTx
pins, then the watch could go into EM2 sleep mode with PWM outputs
enabled. Now the OS has to wait until backlight & buzzer are turned off
in order to switch to EM2.https://ohwr.org/project/f-watch/issues/3External interrupt sources2019-02-12T11:18:40ZProjectsExternal interrupt sourcesThere is a minor issue with interrupt pins. According to the AN0012
\[1\]:
"The pins with the same number from each of the ports are grouped
together to generate an interrupt, meaning that the user can't, for
instances, use pin 0 from both PORT A and B as external interrupt
sources. There can be up to 16 external interrupt sources, which are
connected to 2 interrupt lines. The even numbered pins will generate
an interrupt on the even interrupt line, and the odd numbered pins on
the odd line. The interrupts can be generated by a rising edge
transition, falling edge or both."
It means that we cannot easily distinguish between an interrupt coming
from the ambient light sensor (PA6) and bottom-left button (PC6).
I think right now we will have timer based polling, but it could be
improved in rev2.https://ohwr.org/project/f-watch/issues/4Make pcb mounting holes bigger2019-02-12T11:18:41ZProjectsMake pcb mounting holes biggerIncrease pcb mounting holes drill size to 1.5mm and use [P-tite 1.4x3mm
screws](http://www.micro-modele.fr/index.php?page=shop.product_details&flypage=flypage.tpl&product_id=16918&category_id=933&option=com_virtuemart&Itemid=17&lang=en)https://ohwr.org/project/f-watch/issues/5Move pressure sensor away from button2019-02-12T11:18:41ZProjectsMove pressure sensor away from buttonThe pressure sensor should be moved away from the push button to allow
thicker wall of the case.https://ohwr.org/project/f-watch/issues/6List of improvements to v3 of the case2019-02-12T11:18:42ZMaciej LipinskiList of improvements to v3 of the case\- width of the pocket for screen connector - make it wider on the side
wall
\- improve the bug introduced by correcting USB wall (added pad, screwed
place for seal)
\- the bending/angles in the pocket for the case seal/o-ring are to
sharp
\- pockets for the screws to attach both parts of the case are too big
\- add "ohwr.org" on the case cover, next to the ohwr logoMaciej LipinskiMaciej Lipinskihttps://ohwr.org/project/f-watch/issues/7Ambient light sensor placement2019-02-12T11:18:42ZMaciej LipinskiAmbient light sensor placementIt is slightly hidden behind the screen, it could be moved a bit closer
to the edge of the PCB so that it's better exposed to the lighthttps://ohwr.org/project/f-watch/issues/8Replace the splash-proof micro-USB connector by a water-proof IP67 model2019-02-12T11:18:43ZProjectsReplace the splash-proof micro-USB connector by a water-proof IP67 modelA new model of water-proof micro-USB connector is
available:
http://www.selectronix.co.uk/series.asp?did=277\&sid=426\&campaign=wizemail\&dm_i=KF3,2MTDM,44SQXT,9MDU8,1
It might simplify the case sealing (no need of an extra joint around the
connector).https://ohwr.org/project/f-watch/issues/9Add an LNA between ANT_OUT and pi filter2019-02-12T11:18:43ZProjectsAdd an LNA between ANT_OUT and pi filterAccording to Antenova, to improve the GPS module sensitivity, a Low
Noise Amplifier should be added between ANT\_OUT and the pi filter.
e-mail from
Rob.Orford@antenova.com
For a watch application meaning a very small GND plane I would highly recommend an external LNA between the ANT_OUT (pin4) and the pi network.https://ohwr.org/project/f-watch/issues/10Vsel badly connected on TPS780180300 LDOs2019-02-12T11:18:43ZProjectsVsel badly connected on TPS780180300 LDOsAccording to datasheet:
Vsel \< 0.4V =\> output voltage high (3V)
Vsel \> 1.2V =\> output voltage low (1.8V)
But in reality, it is the opposite.