RA3 won't get a high level.

[selbstdual]

Well if the simple TOGGLE PORTA.3 loop don't work, you have to fix it first. Trust me it's working here.

I fixed it, now it works. Let's see if the other code works aswell.

Tell me something: How can I be sure that a problem can be found in the externals ? There are so many switches in the chip - the manufacturer calls them features, I name them obstacles.

[selbstdual]

The other code doesn't work, because the capacitor doesn't discharge.

I am using a WIMA MKS 4 0,01/250-N4 capacitor, I guess that means 10nF.

The resistor is 40K.

That should mean it takes 0,00004 seconds to charge and at a maximum the same to recharge due to - er - well-intended voltage levels.

Then I am recharging it, while counting, but it doesn't stop. When short circuiting the capacitor it works, so the code is OK.

Is this cap no 10nF - cap ?

Is there anything to be changed in the code ?

ADCWert = 0
Trisa.3 = 0
High Porta.3

Pauseus 244


Trisa.3 = 1
High Gruene_LED
WHILE Porta.3 = 1
ADCWert = ADCWert + 1
WEND
Low Gruene_LED
Zaehler = 600 - ( (600 / 1200) * ADCWert) ;to keep time even
Pauseus Zaehler
RETURN

[mister_e]

maybe because your Pauseus 244 is way too high? try to remove it.

[selbstdual]

This is right. It should be 40.

But.

I found out that the circuitry itself acts as a huge capacitor compared to this one.

I replaced it with 58 pF and threw away my calculations. Now it's time
to experiment....

I am using it ratiometrically but the same value doesn't seem to exist two times.

Wert:
	ADCWert = 0
	Trisa.3 = 0
	High Porta.3

	;Pauseus 800
	
	
	Trisa.3 = 1			
	WHILE Porta.3 = 1
		ADCWert = ADCWert + 1
	WEND
	Trisa.3 = 0
	Low Porta.3 ;To make UC = Vss
	Pauseus 100 ;To make UC = Vss
	RETURN

Somehow the capacitor has to have time to charge, having a too high value for Pauseus doesn't affect the measurement, it makes sure that the cap is surely charged. But here I cannot know when it's surely charged, but this must be more than zero.

[selbstdual]

I did some testing. This is the result: Max = maximum value of the resistor, InB = In Between. Pause = Pause to load the cap.

		Max	InB	Min	Min	InB	Max
Pause 3		46336	54273	16388	8965	48132	30980
Pauseus 5	39433	54025	11274	64777	11529	27145

It should be in the form of x² or -x². But both show strange behaviour.

Do you have an idea ?

[sotoshie]

I fixed it, now it works. Let's see if the other code works aswell.

how did you fix it? do you still remember?

[Acetronics2]

how did you fix it? do you still remember?

Hummmmm,

how to tell it ???

Last Activity:- 8th May 2008 12:14.

6 years after his last post ...
( and moreover ... I thought he had been banned !!! )

Alain