Weekmeter

This here is a project I took on after a 3D printing shop popped up in my street. I wanted to get something to design and print but couldn't come up with an idea for something useful. Then I realized that at work, we schedule everything based on the calendar week and I always need to check it from a calendar. So I decided to make a "Weekmeter".

The device uses an Arduino Nano to receive the real-time clock from a DS3231 chip, calculate the week of the year, and then print it to the LED screen. The LEDs are controlled by two TM74HC595 chips. The week calculation is done using code by 'madepablo', which I share below. This code calculates the week of the year according to the ISO 8601 standard.

The device also has a DS18B20 temperature sensor and with the help of a switch, it can show the current temperature. I stuck the temp probe outside the device because inside the device it measured about 4 degrees higher. I don't know why the temperature was so much higher. I suppose the LED screen heats up a lot.

The enclosure design was the most interesting part about this project and I used Creo Parametric for this one. It took me a while to get it to look good but I was happy in the end.

I had the part printed in Triaxis Gent, using FDM ABS.
All the electronics were bought from Banggood.com.

Thanks Hatem Medhat for his help with the code :)

Documentation

Here are the Arduino codes, libraries and the 3D CAD file.

• Week calculation by 'madepablo'
• Weekmeter_s7.stp (CAD file)
• Arduino code
• Library for plotting on the LED screen. (built upon the work of Kostarev here.)
• Communication with the temperature sensor using OneWire library.

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.