i have added a 10k pullup to MCLR.
for the fuses i have NOBROWNOUT, NOWDT, NOMCLR...
(#fuses NOWDT, NOPROTECT, NOBROWNOUT, NOPUT, NOLVP, XT, NOMCLR)
in my earlier posts I had not connected the DC/DC converter yet.
now that I do i get resets.
If i completely disconnect the motor and the tip42 I still get the resets.
Should I also add a small capacitor on MCLR... i have read a 1-10nf helps.
updated schematic: **broken link removed**
I have also heard the 4550 is partularly buggy when it comes to resets. (?)
Even with the 10K it still resets.
i have tried previously adding a 7805 thinking that the DC/DC was not regulated well.
This did not help. Then I tried a 5V MCP1702... with 1uF caps and this did not help.
the small drop in the diode is good enough... wont affect the pic at all since it has a wide voltage range. It also does not seem to bother the LCD at all.
I am at a loss... i have checked the circuit numerous times. I have added the pullup resistor.
on the 'Brightness' pin, I could not get the backlight to light up at all without it. Just doing a PWM didnt seem to work.
If i disconnect them both and just run a line straight to Vdd it is very bright, but then I cannot adjust it.
Maybe I will try to remove this from the circuit. since I have not added a screen yet for adjusting it anyways. But again, when the PICKIT2 is connected it is not an issue.
Would it be better to enable MCLR and keep the 10k resistor?
---------- Post added at 02:08 AM ---------- Previous post was at 02:03 AM ----------
I will try to add the 100uf cap as well. I think I may have a fast switching one around, but i dont know its P/N off hand so I am not sure of the voltage drop. I believe it is small though (just judging from its size :/
This 100Uf cap you are proposing should also stay in series i presume?
thanks again all of you... After it is all working I wil post some good pictures of the whole project for you. As well as the zipped code.