How it's work?

Every 0.5 sec CPU wake up(cycle iteration time 100 nS) and increase milliseconds value and come sleep mode(3 uA).

If you press button "TIME();" it show hours and minutes(0.5 seconds per value) in binary mode in 4 LEDs.

Video demonstration:

Source code(for Arduino IDE - "t13B Watches.ino") here:

The thickness of the board is recommended to take 0.8mm otherwise it may not fit into the case.

by Techn0man1ac Labs, 2023

Design Drawing

schematic diagram

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PCB

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BOM

ID	Name	Designator	Footprint	Quantity	Contributor	spiceSymbolName
1	CR2032 3V	B1	BAT-SMD_CR2032-C9900005595	1	Alex710	ER14250-3.6V2032
2	100n	C1,C2	C0805	2	LCEDA_Lib	C_0603_US
3	LED-0805_R	LED0,LED1,LED2,LED3	LED0805	4	LCEDA_01	LED-0603_R
4	10k	R1	R0805	1	LCEDA_Lib	R_0603_EU
5	100k	R2	R0805	1	LCEDA_Lib	R_0603_EU
6	470	R3,R4,R5,R6	R0805	4	LCEDA_Lib	R_0603_EU
7	K2-3.6×6.1_SMD	SHOWTIME	KEY-SMD_2P-L6.2-W3.6-LS8.0	1	LCEDA_Lib	K2-3.6×6.1_SMD
8	ATTINY13A-SN	U1	SOIC-8_L5.3-W5.3-P1.27-LS8.0-BL	1	LCSC	ATTINY13A-SN	Extended Part

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Project Attachments

Order	File name	Download times
1	ATtiny13BinaryWatches-main.zip	2

Project Members

Techn0man1ac