Design also like Polar loop, LG smart activity tracker ... Because I have led obsession :-)
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Features:
- Atmega328
- 22x5 0603 LED Matrix charlieplexed display https://hackaday.io/project/18014-5-alphabets-charlieplexed-matrix-display-22x5
- DS3231
- Liion USB charging
- Buzzer
- MMA8452Q accelerometer
I have plan now work without communication with phone. there is lot products with pedometers, sleep tracker and more. This is for my dumbest things. It's stupid leave machine to make decisions how to sleep, eat, walk ....
Display testYesterday I received boards from OSH PARK.
Thanks very much for ulra fast shipping, there is result.
just one small bug MMA8452Q is rated on max supply voltage 3.6V
but watch are powered with lion battery full charged on 4.2V
all working now, firmware is very simple now, just display time, temperature and voltage. Display is activated with hand rise (no touch, no shaking).
Screen filter, just thin board with 110 holes
1.73x0.78 inch (43.82x19.74 mm) 2 layer board.
This is awesome! Does the USB also connect power? Nice connector choice regardless.
On USB male is power for charging, on USB female are mosi, miso, sck, reset for programing
Hi, this looks awesome!
I'm new to charlieplexing. Looking at the code, only 1 led is ON for 100 microsecond at any time, so the brightness for every led is always the same, correct?
bobricius
Dimitar
joshua.vader
Steve Smith
Nice project ;)
Should I have a question about PCBs? I have seen, that You are using a LED display from your previous project. But how is the display connected to device? Over A0-A3, D4-D10? From the pictures looks like, there are only 2PCBs. One 2-layer control board and one 1-layer shield. So where the display is?
Thank You for clarification