Features

• Minimal jumper wires, 4 on a mini breadboard
• Personalization via LED placements and leg lengths
• Battery operated from 3V
• Use of 32Khz clock crystal to keep time, power-down sleep mode (LPM3) takes less than 1uA power

Parts list

• 170 tie point mini breadboard
• MSP430G2412 (or other G/F series dip 20 pin devices w/ 4k flash)
• Lots of LEDs (1 blue, 9 green, 6 yellow, 9 red)
• Tactile button
• 32Khz clock crystal
• CR2032 button cell holder (battery not included)

Application Notes

• Single button press shows time for a few seconds, TCG returns to sleep after that
• Long press setup time, starting with the hours, related LEDs starts to blink
• Short press advance the hour value. Another Long press confirms the entry
• The tenths of the minutes and the minutes are subsequently entered like the hour
• Once the hours and minutes (tenths and singles) have been entered, TCG returns to show mode

Breadboard Layout

Schematic

Assembling

• Follow breadboard layout and place jumper wire on mini breadboard
• Place MSP430G2412 on breadboard
• Place Tactile Button
• Cut your LEDs into different lengths, *be sure to maintain one leg longer
• Place LEDs in groups of (1..9), opposing pairs on the same pin can be swapped for effect. Ex at b0-b1 #3 and #8 can be swapped. The "+>" is the blue LED indicating 10+ hours
• Place Battery Holder

Source code

Source code usually resides on my github repository. https://github.com/simpleavr?tab=repositories
source code not yet available. needs cleaning up.