Hi Rob, 2009/4/5 Rob Hamerling <[email protected]>: > > I tried a 16f876A: works! But the maximum lighting with PWM is much > darker than when I feed pin 15 of the LCD directly with 5V (via a diode > to het approx 4.3V). I don't know how much mA backlight draws. I > currently feed it directly from pin_C2, but I probably need a transistor > or mosfet. A backlight might well take 100mA, way to much for a PIC pin to supply. It can make a start, but don't forget to add a resistor to limit te current. When you use a transistor, but a resistor in the base circuit, but the backlight can do without (or one of 10E).
> I also tried a 16f886 on the same board. Does not work reliably. Starts > OK immediately after downloading the hex file, but gives left-shifted > text or even totally random text when repowering it. Could it have to > do with the 'enhanced' PWM? Maybe there is some interference. Works fine > with another sample program without PWM. That's strange... The lcd and pwm routine are unrelated, so maybe there is a power supply issue? I don't know what 'enhanced pwm' is. Is it a feature of 16f886? And does the pwm test programs of Seb run okay on this chip? Joep --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "jallib" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/jallib?hl=en -~----------~----~----~----~------~----~------~--~---
