TreadBot

[skimask]

well, right now my power board works great with a 16f877a, the motor driver and the motors. (both motors togetehr are around 200mA at full speed). when im playing with the 18f6585, i dont have the motors, motor driver and all the other little stuff isnt hooked up. just the pic and an led!!! when i measure the resistance across the board, (with the PIC in) i get about 1 Mohm. input voltage is around 7.4 (fully charged cells). but ohms law says that 5V going through 1Mohm, there is almost no current... not a short... even when i hook my multimeter up, it shows no current.. but the voltage drops right down to around 2V

Ok, all notes noted....
You're using a '6585 now...
You didn't by chance get the pinouts between the TQFP and PLCC pinouts mixed up did you?

[dragons_fire]

yeah, i was trying to use a 6585... i did use the pLCC pinouts. i need to look into that some more though, cause i was thinking that maybe my pins dont match.. in expresspcb, when i click on a pin, it tels me the #, i think maybe its wrong, or it might be different than my socket, and that could be causing my problem..

nothing heats up anymore, i just lose voltage, and my "power" LED dims. maybe this PIC is shot from my mess up earlier, that its not allowing things to work now..

i put this project on hold for the weekend, im building a lightning trigger for my DSLR camera. sensor works great on the breadboard, im just trying to figure out my optoisolator to keep my circuit seperate from the camera... im using a 16F88 for this (i was going to use a SMT 12F675, but i have lots of room and lots of 88s).

im still thinking about my robot, so i didnt give up on it, so im open to any suggestions.. im trying to avoid making an adaptor to breadboard it first.

[Darrel Taylor]

Hey Dragon,

It appears that all the VDD and VSS on your PCB are backwards.

Here's a 68-PLCC socket and 18F6585 pinout

<table><tr><td valign=bottom></td><td valign=top></td></tr></table>

and here's your PCB

I haven't checked the rest of the pins.

HTH,

Added: Oops, and PIN 49 is VDD

AddedMore: No doubt the original chip is Fried.
<br>

[mister_e]

that confirm my thoughts 72-73 post ago

[dragons_fire]

thank you so much!!! i have been over this board so many times, with the datasheet in one hand, and the schematic in the other..

i new it had to be something stupid like that, i just couldnt find it..

i definately feel like a retard now!!! 2 different boards (designed from the beginning both times) and a weeks worth of going over and measuring..

thanks again!!!

[mister_e]

**** happen my friend. I guess you will'nt do it again

[Darrel Taylor]

Never done THAT before. ... Yes I have.
(that's how I knew to look for it)
<br>

[dragons_fire]

it is actually my first time doing that... but im sure it wont be the last..

at least i enjoy making the boards, i think its part of the fun. i also only soldered on the basics, so its not much of a loss of money...

i cant believe i didnt notice it.. i started from scratch on the second board, and i still didnt get it right...

thanks again!!