The code works on a medical detector called Astragalus detector.And the device is based on Arduino UNO.
Althon I delete the algorithm for calculating medical values, you can still learn the way using Arduino to contorl TF Strorage Card/LCD screen/Membrane keyboard/buzzer/LED and so on . I have record a video to show the effect.Arduino
The sparkling point of the project is using one wire to control an 4×4 keypad.This can save some pin port.The connect way show as below:
The libray file for one wire to control the keypad is OnewireKeypad-master.rar,you can download it and try to run on your Arduino device.
The whole project's circuit layout shows as below:
Hope this can help you.