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I am making a Wrist Watch!

embedded stm32 stm32l011f4

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andi-makes 90aa258347 [firmware] refactor code		2021-10-30 20:59:22 +02:00
firmware	[firmware] refactor code	2021-10-30 20:59:22 +02:00
hardware	Hw3 (#4 )	2021-05-06 11:14:32 +02:00
model	modified case and wip endcap for wrist-band	2021-05-17 10:54:54 +02:00
.gitignore	hardware revision	2020-12-16 19:23:09 +01:00
README.md	Describe Hardware in README.md	2021-02-16 13:31:58 +01:00

README.md

andi makes a wrist watch! ⌚

It ain't pretty, but it's mine! 😄

Hardware 💡

Microcontroller

The microcontroller used by this project is the STM32L011F4 from STM. It features many peripherals as well as low power operation features.

Display

This watch displays the time using four KCSA02-105 7-Segment displays from Kingbright. They were chosen because of their small footprint. Those 7-Segment displays are driven by the STP08DP05 serial constant current driver from STM.

Power

In it's normal operation, the watch gets powered by a LIPO battery. It can also be powered by an external powersource which provides 5V. The external connection is also used to charge the internal LIPO using a MCP73831 charger IC from Microchip. For OR-ing those two power supplies together so that the battery is not used for powering the circuit during charging two LM66100 ideal diodes are used. The resulting powerline gets regulated by a TLV70033 linear voltage regulator. The resulting 3.3V are used to power the microcontroller. For the powersupply for the display the non regulated voltage is used.