Circuit diagram :

data recorder schematic

A card holder holds the card and it communicates with harware SPI port of the arduino.

SD card attachements : MOSI = arduino pin 11, MISO = arduino pin 12, CLK = arduino pin 13, CS = arduino pin 10 
LCD connections : RS = arduino pin 7, EN = arduino pin 6, D4 = arduini pin 5, D5 = arduino pin 4, D6 = arduino pin 3, D7 = arduino pin 2, D0 to D3 = ground.

DS1307 connections : SCL = arduino pin 19(AN5), SDA = arduino pin 18(AN4)

Button connections : Up = arduino pin 8, Down = arduino pin 9, Menu = arduino pin 16(AN2), OK = arduino pin 17(AN3)

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