![]() I added holes and cutouts for the power jack, LCD display, time setting push buttons, and speaker. The Fusion 360 Tutorial – Easy Snap Fit Cases! demonstrates a useful technique for designing parameter-driven (length, width, height, shell thickness) cases with snap together features for a no-screws/glue enclosure. This project was a fine opportunity to improve my 3D CAD design skills. ![]() ![]() Resources for the Arduino code and connections: I connected these to 2 pins that are enabled for interrupts and used attachInterrupt()Ĭode is in the "shoni_clock.ino" attachment. Two push buttons increase/decrease the time by one minute. (Of course, this design allows you to use any sound for the alarm.) mp3 file to the SD card and inserted it in the DFPlayer Mini. With Audacity, I converted the recording to mono, trimmed it to a shorter length, added a fadeout, and saved it to a. For an alarm sound, I liked this " Singing bowl struck with a felt-tipped mallet" recording on Freesound. The DFPlayer Mini MP3 Player documentation includes a connection diagram and sample code. Note that the DS3231M is not temperature compensated, so check carefully before purchasing. However, I learned that the DS3231 RTC is a better choice because it includes a temperature-compensated oscillator for more accurate time-keeping. It includes a CR2032 backup battery to keep time when the the overall project isn't powered. I first used the "Tiny RTC" DS1307 real-time clock. This is good platform for prototyping Arduino projects, along with many other similar platforms. I prototyped the design with a SparkFun Inventor's Kit which includes an Arduino Uno board, breadboard, jumper wires, etc.
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