/kids-alarm-clock

DIY alarm clock for kids

Primary LanguageC++MIT LicenseMIT

DIY Kids Alarm Clock

A DIY alarm clock for kids: display cute pictures and play their favorite tunes when it's time to wake up!

Approved by Marion, 7.

DIY alarm clock

Uses WiFi to get time, ring settings, pictures and tunes: no fiddly local setup, no power loss resets.

More a proof-of-concept than anything else, feel free to hack around!

Hardware

  • ESP32 (ESP8266 is probably memory short)
  • ILI9341 TFT screen
  • I2S MAX98357A 3W amplifier, Adafruit board
  • 3W audio speaker

Less than $40, add $10 if you need a prototype board, some wires and headers for a clean setup.

alarm clock components

Wiring

wiring diagram

Software

ESP program

Add the following libraries to your Arduino/PlatformIO/whatever setup:

  • TFT_eSPI (screen)
  • TJpg_Decoder
  • ESP8266Audio (ESP32 compliant)

Create a config.ino file (see config.ino.sample)

You must also configure TFT_eSPI library, in its User_Setup.h (most values have correct default):

#define ILI9341_DRIVER
…
#define TFT_HEIGHT 240
…
#define TFT_MISO 19
#define TFT_MOSI 23
#define TFT_SCLK 18
#define TFT_CS   15  // Chip select control pin
#define TFT_DC    2  // Data Command control pin
#define TFT_RST   4  // Reset pin (could connect to RST pin)
…
#define TOUCH_CS 21     // Chip select pin (T_CS) of touch screen

Server

In config.ino, 4 URLs are defined, see the following list. You can drop the provided PHP script somewhere or write your own server following the correct data formats.

  • URL_TIME_GET (time.php): return the current date/time in Y-m-d H:i:s.u format (ex: 2021-05-10 11:24:36.254200)
  • URL_RING_TIME_GET (ring.php): return the next ring time in Y-m-d H:i:s format (ex: 2021-05-11 07:55:00)
  • URL_IMAGE_RAND (rand_image.php): return raw JPEG image data (image/jpeg content type)
  • URL_RINGTONE_RAND (rand_ringtone.php): return the absolute URL of the MP3 file to play

Configure ring time

To configure the time (and days of the week) of the alarm with the provided scripts, see ring.php → ring_this_day() function.

Assets

Provided PHP scripts will look for the following sub-directories:

  • images: JPEG files, 320x160, non-progressive
  • ringtones: MP3 files, no duration limit (streamed)