http://rogerparks.com/allprojects/other/simple-arduino-lcd-clock/
SEE ATTACHED SCHEMATIC
NOTE THE VOLTAGE DEVIDER
YOU WILL NEED TO ADD YOUR SWITCHES WIRED PER THE SCHEMATIC
The following array shows the high limit analogRead value for each buttton
int adc_key_val[5] ={ 30, 150, 360, 535, 760 };
1602+LCD+Shield+Sch.pdf (163 KB)