16F877A and LCD HD44780

[towlerg]

1. It will not work without diodes because ADC needs RMS voltage to operate properly and the diodes (shotky works the best) provide the required RMS voltage.

In that case you've found an error in the sim. Sim show significantly increased "movement" but no other changes.

George

[Archangel]

epilot,
I think you're off base here, A translated portion

BARRA: 'spanish
IF MARCA1 = 1 THEN 'Si es verdadero
LINEA = $2 '1 Linea LCD, muestra canal L
ADCIN 7, CANAL
MARCA1 = 0
ELSE 'Si no lo es
LINEA = $c0 '2 Linea LCD, muestra canal R
ADCIN 6, CANAL
MARCA1 = 1
ENDIF

BAR : 'english
IF Mark1 = 1 THEN                             ' If true
LINE = $2: ADCIN 7, CHANNEL: Mark1 = 0        ' 1st line LCD shows L channel
ELSE                                          ' If it is not
LINE = $c0: ADCIN 6, CHANNEL: Mark1 = 1       ' 2nd Line LCD shows R channel
ENDIF 'End of the comparison

I am pretty sure sensitivity is as I stated above in post 11, ADCON1 & VREF