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yes, i have mentioned that in the first post.

i have a 220nf capacitor on Vusb. i changed that to 470nf, still nothing changed

here is simple schematic for basic connections

4951

thx darrel,

I already have 100nf ceramic capacitor between vdd and vss so close to PIC.

LVP disabled, IESO disabled

i have 100nf close to used connector.

the crystal is the same. i dont...

Yes i m using USB rail to power up my MCU. but i dont use a capacitor on MCLR.

I only use a 4k7 resistor connected to USB (+5v) supply.

the strange thing is as i said before, i m using the...

in fact, i was interested to answer your signature statement "EVERYTHING IS RANDOM" more than your question about virtual 3d world !!

Hi all,

I was working on USB HID and CDC last weeks with successful applications using 18f2550.

I made alot of codes and tested them on breadboard.

yesterday, i made a prototype PCB for my...

Nothing is random !! ;)

Hi Darrel,

in fact, row 1 problem was not related to software!! after i tried your last code. i found nothing changed.

I then checked all npn transistors used in rows. i found the transistor...

Darrel,

thx alot for helping, it worked really well.

i always wished to thank you in person. cuz from 3 years i enter this forum as a visitor and i always see ur post. you always find the...

to summerize the problem here is what is happening

* i m loading column data to shift register then latch it
* i m scanning the rows each for 1 ms

* when moving from a row that has a pattern...

Hi everyone,

I m trying to drive 8x8 dot matrix and i m facing a weird problem.

when i try to display simple pattern like this
4917

i got

4918

i recommend "30 projects in pic basic and pic basic pro" by dogan ibrahim as a starting point.

the good thing about this book is that it is simple, step by step, and include simple projects to do...

i m reading what you have posted. specially the assembler manual, i find it very useful

:o thx for the links

i know all the basics of programming. i worked on pic for more than tow years and i developed some good project. i do know how to write programs with assembly and basic.

however, sometimes i see...

ok, i wish you good luck

do u know how to program a PIC ?

if you dont, you have to learn PIC programming first.( it is easy !!)

i can suggest some books with experements inside them and...

hi

i have a piece of code i wrote and examined in university. it takes two variable analog voltages and generate two pwm signals on portb.0 and portb.1 depending on the difference between...

thanks alot

thats what i was looking for. i did understand what darrel wrote.

so is it right to say that using
call instead of
L?call will do the job ? but it is more simple for the...

Hello every one

i m new to this forum and i feel sad to start posting questions instead of answers!! but you guyz are so smart and i learned alot from you.

i want to ask about 3 lines in an...

THX FOR YOUR REPLY

robert, i m sending 7 bytes with a baud rate of 2400 . this means 240 byte per second will be recived, that is 0.24 byte per millisecond.

since i m doing a PWM signal, the...

HI EVERY ONE

i m trying to control a robotic arm with wireless serial communication between two PICs. the sender pic takes and input from a joustick potintiometers and send instructios to the...

thank you Darrel for ur help. i ll m reading the codes now and i ll try to understand the main thoughts of controlling servos. thank you so much

hi Darrel,

thx for ur reply.

i m using 6 servo motors ( may be modified to be 8 ) to control the robotic arm. i read about getting 2 PWM signals from 18f2550 but it didnt help since i need...

hi Darrel,

i found a good code for controlling 8 servo motors and i tried it.

its very awsome and it contains a pc sofware too.

unfortunatily, it is written in mokrobasic and it contains...

hi Darrel

thx alot for ur help. this code was very important to me.

my problem now is that i want to control a robotic arm after i made my pc talk to my pic. the problem is that servo control...

hi

i need to know more about interrupts. when using usb communication i have to excute usbservice every milisecond or so. should interrupts help me ?

well, thats something new to learn. thx Darrel

i m now trying to control a robtic arm using USB communication. i m reading about intruppts. i ll report my work in this thread.