Kids player with parent lock

Kids player

The project started out as a user interface to control an MP3 player. Adding a kid lead to a lot of skipping and other interruptions during playback. Seeing how the kid got around the kids lock on the washing machine in five minutes, I decided not to go that way. Instead I changed the project in a game for kids to distract him from the other gadgets around.

The player uses data from an SD card:

• screens
• images
• sounds

The .scr (screen) files tell the player what to do. They are in the JSON (http://www.json.org) format and look like this:

{
        "Init": {
		"image": "4_car.bmp",
		"color": "0xFFFFFF"
	},
	"B1": {
		"sound": "wrong.snd"
	},
	"B2": {
		"sound": "wrong.snd"
	},
	"B3": {
		"sound": "wrong.snd"
	},
	"B4": {
		"sound": "good.snd",
		"screen": "main.scr",
		"color": "0x00FF00"
	}
}

After loading a .scr file, the player executes the "Init" section. The sections "B1" through "B4" are executed in response to pressing one of the 4 buttons.

All sections can have the same fields:

• "image" will put the image on the LCD panel.
• "color" sets the color of the RGB backlight LED of the LCD. The color is specfied in RGB hexadecimal format. So 0xFF0000 is red, 0x00FF00 is green, 0x0000FF is blue.
• "sound" will play the sound from the file. The sound editor "Audacity" was used to create the files. The format is headerless, unsigned 8 bit, mono and 44.1kHz sample rate.
• "screen" tells the player to load another screen.