Lcd With 16f819

[bbarney]

some thing like this I think and your on the wrong forum

DC_Loops = 20

Main:

ADC_Channel = 1 ' ADC on first reference
GoSub ADC_Average ' Perform an averaging to enhance accuracy

Temp_Float = ADC_Result ' Store the result

ADC_Channel = 0 ' ADC on second reference
GoSub ADC_Average ' Perform an averaging to enhance accuracy

ADC_Result = ADC_Result * 5000 / 1023 ' Convert values into Volts (with a scale of 1000)
Temp_Float = Temp_Float * 5000 / 1023 ' to reduce decimal error
ADC_Result = ADC_Result - Temp_Float ' And calculate difference

ADC_Result = ADC_Result / 10 ' Scale back down remembering 10mV = 1 Deg C

If ADC_Result <> Last_Result1 Then ' Check if the data has changed
Print At 1,1, DEC1 ADC_Result, 0, "C " ' and only update display if it has
Last_Result1 = ADC_Result ' Store new data
EndIf

GoTo Main ' Loop for ever


ADC_Average: ' Perform an averaging on ADC conversions
' to reduce errors
ADC_Total = 0 ' Clear summing register
For Temp = 1 To ADC_Loops ' Loop for a pre-determined number of times
ADC_Result = ADIn ADC_Channel ' Grab a new ADC value
ADC_Total = ADC_Total + ADC_Result ' Sum it to the total register
DelayUS 1 ' Allow internal capacitors to discharge
Next Temp

ADC_Result = ADC_Total / ADC_Loops ' Determin the average of all the equations

Return

[wilfrieds]

Hi guys

thanks for the tips.
The adc jumping was sorted out by putting the cap closer to the 7805 regulator.
A Tantalium cap also improved stability. so for good measure I ised both.

I also tried ceramic caps but they didn't make any difference.

The ADC range adjustments seem interesting, still working and experimenting with that one.
Math calc's don't always seem to be spot on.??? ( maybe it's back to school).

Regards
Wilfried

[wilfrieds]

One more problem remaining.

How to display say 4.85V from a ADC result.
Problem being the dot off course.

Thanks
Wilfried

[mister_e]

As your as your result = 485 or 4850, you just need to format it. Look for DIG and DEC modifier in the LCDOUT section.