' Name        : VUX2.pbp
' Compiler    : PICBASIC PRO Compiler 2.6
' Assembler   : PM or MPASM
' Target PIC  : 28/40-pin PIC types compatible with LAB-X2 board
' Hardware    : LAB-X2 Experimenter Board
' Oscillator  : 4MHz external crystal
' Keywords    : ADCIN, PWM
' Description : PICBASIC PRO program to display result of ADC in 3
' segment bargraph. The last LED in the graph dims or brightens with
' changes in the analog input.
'

' Define LOADER_USED to allow use of the boot loader.
' This will not affect normal program operation.
Define LOADER_USED 1

' Define ADCIN parameters
Define ADC_BITS     8   ' Set number of bits in result
Define ADC_CLOCK    3   ' Set clock source (3=rc)
Define ADC_SAMPLEUS 50  ' Set sampling time in uS

adval    Var Byte       ' ADC result variable
i        Var Byte       ' For-loop variable
position Var Byte       ' LED position variable
bright   Var Byte       ' Brightness variable

   ADCON1 = %00000010   ' Set PORTA analog

mainloop:
   ADCIN 0, adval             ' Store ADC value to adval
   position = adval / 85      ' Position of last lit LED
   bright = (adval // 85) * 3 ' Brightness of last lit LED

   For i = 0 To 2             ' Set each LED
     If i < position Then
        High i  ' Turn on if lower than last lit LED 
     Else
        Low i   ' Turn off if higher than last lit
     Endif
   Next i
   PWM position,bright,5      ' Dim the last LED
   Goto mainloop              ' Do it forever

   End