Standard Parts
All standard parts required for the construction of an overhead alarm clock are listed below with details of the sources of supply. Special parts like "Front Panels", "Mounting Plate", "Printed Circuit Board" as well as small parts (screws, nuts etc.) are listed on Special- & Small Parts.
The parts and shops of this list are of course only suggestions; if you know better or cheaper ones: Infos welcome!
- Wooden box, 1 piece, as cabinet, MidaCreativ
- Red display, 1 piece, clock display, EXP Tech
- Yellow display, 1 piece, alarm display, EXP Tech
- Connection cable with socket and plug, 5-pole, 2 pieces, connection of the displays with the board, Marotronics
- Adafruit DS3231 Precision RTC Breakout, 1 piece, keeps the exact time independent of Arduino, EXP Tech
- CR1220 3V lithium button cell, 1 piece, keeps the watch running, even when 5V supply is interrupted, EXP Tech
- MP3-Player-Module, 1 piece, plays the alarm sound, Amazon
- SD card, 1 piece, contains the MP3 file used as alarm sound Pollin
- Adafruit FRAM Breakout, 1 piece, stores alarm time even if 5V supply is interrupted, EXP Tech
- Button red, 4 pieces, for setting the clock, EXP Tech
- Button yellow, 4 pieces, for setting the alarm, EXP Tech
- Rotary switch, 2 pieces, for operating modes "Clock: Run/Set" and "Alarm: Off/On/Set", Pollin
- Rotary potentiometer, 3 pieces, two for brightness and one for volume, Pollin
- Connection cable with socket and plug, 2-pole, 9 pieces, eight for the push buttons and one for the clock switch, Marotronics
- Connection cable with socket and plug, 3-pole, 4 pieces, three for the potentiometers and one for the alarm switch, Marotronics
- Rotary knob red, 2 pieces, one for the clock potentiometer, the other for the clock switch, Pollin
- Rotary knob yellow, 3 pieces, 1x alarm potentiometer, 1x alarm switch, 1x volume switch, Pollin
- Recessed speaker, 1 piece, output of alarm sound, Amazon
- 1k resistor, 1 piece, for use in PCB, Pollin
- 10k resistor, 11 pieces, for use in PCB, Pollin
- Stacking strip 40pole, 2 pieces (subdivide into 1x 18-pole, 1x 10-pole, 3x 8-pole), Marotronics
- Stackable Header - 8 Pin (pack of 10, only 4 pieces needed), 4 pieces, for RTC, FRAM and MP3 module, EXP Tech
- Configurable Spring Terminal Blocks, 5 pieces, to connect the board with relay PCB and loudspeaker, EXP Tech
- MEGA 2560 R3 ATMEGA Board Arduino Mega 2560 comp., 1 piece, for operation of hardware and software, Eckstein
- Relay, 1 piece, to separate the speaker input as long as no MP3 file is played (avoids noise and hum), Marotronics
- USB cable 1.8m, 1 piece, to connect the Arduino to the Power Bank, EXP Tech
- Power Bank, 1 piece, for power supply of Arduino, also in case of power failure, Amazon
- Switching power supply unit, 1 piece, for power supply of Power Bank, Pollin
Further Material
- Some switching wire
- Shrink tubing
- Plugs + screws for wall mounting
- Optional: Cable duct plus dowels and screws for routing the USB cable (between alarm clock and Power Bank)