Arduino-powered alarm clock

thingiverse

I Made an Alarm Clock That Was Really Fun to Build, But It's Not Easy to Replicate Because the Electronics Were Mostly Tinkered Together on a Perfboard. This Project Is Powered by an Arduino Nano Pro, an SI4702 FM Radio Connected via Level Shifters, a DS1307 Real-Time Clock, and a Small Audio Amplifier. The Display is Based on Four MAX7219 LED Matrix Modules from Aliexpress. The Left- and Right-Hand Side of the Panel Have Press-Fit Holes for 4 Small 28mm Speakers. The Display Modules Are Mounted on an Insert, Which Is Attached to the Front of the Clock. On the Rightmost Module, I Replaced the 8x8 Matrix with a Daughterboard Featuring a 4-Digit 7-Segment Display and Some Status LEDs. It's Slightly Offset to Compensate for the Difference in Height. To Improve Contrast and Reduce Brightness, I Mounted it Behind Tinted Acrylic Glass. Unfortunately, My Local Supplier Didn't Have Very Dark Acrylic, So I Had to Use Two Layers Instead. The Top and Bottom Are Attached to the Side Panel Using Self-Tapping Screws. These Might Strip Out After Opening and Closing the Clock a Few Times, But Inserting a Match into the Posts Works Fine to Provide More Grip for the Screws. You Can Find the OpenSCAD Source Code Below. I Know It's Not Very Pretty, and It May Not Be the Best Way to Achieve Things. The Source Code Is Located at https://github.com/pienjo/ClockRadio