Core PCB

AlarmClockRestoMod

ESP32 Software for an Alarm Clock Resto Mod.

The idea is to use the components of an old alarm clock and replace the electronics with an ESP32, adding a lot of features to it. From an outside perspective, the clock will look as original as possible.

Features

• WiFi connectivity
  • NTP time synchronization
  • Web server for advanced configuration
  • OTA updates
• Bluetooth connection from phone and to headphone/speaker
• Clock:
  • 7 segment display with dimming function
  • RTC for time keeping when power is out
• Alarms:
  • Configurable via web interface (advanced) or via buttons (only next alarm)
  • Configurable music or internet radio or buzzer for each alarm
  • Snooze function (delay configurable via web interface)
  • Vacation mode (turn off all alarms for a configurable period of time)
• Radio:
  • Internet radio stations configurable via web interface
  • Tuner button to switch between internet radio stations or playlists on microSD card
• microSD Card to store pre-owned Music, playlists and configuration files

Components Overview

• Display is a 7 segment 4 digits with a TM1637, dimmable by software
• DS3231 for time keeping when power is out
• microSD Card with:
  • MP3 songs and playlists
  • Configuration file for radio stations (accepts internet radio station or playlist)
  • Configuration file for different alarms
• The tuner button of the alarm clock is a variable capacitor (10 - 500pF) read via a MPR121
  • Each frequency corresponds to an internet radio
• Bluetooth to connect to cellphone (play music from it) or to an external speaker/headphone
• Normal speaker connected via MAX98357A
• Buttons (Telefunken Digital Electronic 101):
  • 2 momentary switches to set time (Fast and slow)
  • 1 latching switch to turn on auto dimm/full light on display
  • 3 mutually-exclusive latching switches: show time, show next alarm (use the 2 momentary switches to set the alarm time) or "sleep mode" (turn on radio for 60min)
  • 1 momentary switch for sleep function (during alarm, press once to delay alarm in 5min, press twice to turn off alarm; during sleep mode, turn off radio)
  • 1 Volume slider (potentiometer)
  • 4 mutually-exclusive latching switches: turn on radio, turn off radio, alarm with radio, alarm with buzzing sound
  • 2 mutually-exclusive latching switches: radio corresponds to playlists, radio corresponds to internet radios
  • 1 momentary switch: one click (tries to connect to configured bluetooth speaker), two clicks (turns on bluetooth for phone to connect); if bluetooth connection is not successful after 1 min, turn off bluetooth
• Alarms:
  • fully configurable via web interface
  • choose days of the week
  • snooze time configurable
  • vacation mode
  • music and internet radio configured via web interface