The idea for this project is to repurpose an analog wall clock to display the date instead of the time. The hour hand will display the month (1 to 12) and the minute hand will correspond to the day.

This hack involves slowing down the clock mechanism so that the minute hand only moves once a day and it takes the hour hand a whole month to move by an hour.

Thus the clock only ticks for a few minutes each day, this reduces the current draw significantly to around 6uA, leading to a theoretical battery life of around 50 years.

The Calendar Clock visually indicates how much of the year has passed by and can potentially incentivize people to plan their days and use time more effectively.

The complete build process can be found here: https://www.instructables.com/Calendar-Clock-50-Year-Battery-Life/

Recognition

Received the battery buster Honour on Hackadays Low Power Challenge

Low-Power Challenge: Making an Analog Clock Into a Calendar With a 50-Year Life

Contributor:

1. Josh Elias Joy