Society of Robots - Robot Forum

Electronics => Electronics => Topic started by: junior000 on July 13, 2008, 12:47:27 PM

Title: my first board!
Post by: junior000 on July 13, 2008, 12:47:27 PM

hi,

    i have designed my first board using pic 18f4550.
   
  here is the link  http://myfirstbot.blogspot.com/2008/07/my-first-board.html (http://myfirstbot.blogspot.com/2008/07/my-first-board.html)

     is the board ok or does it need any changes??

   

Title: Re: my first board!
Post by: paulstreats on July 13, 2008, 04:57:49 PM

The board looks fine at fist glance, the only things that i would do are to change the crystal oscillato to a ceramic one thereby removing the need for any capacito on it. Also add a header for in circuit seial programing. Add a seial or usb output so you can coneect it to a computer while its woking, and maybe swap out the l293 for an l298 (they allow a more poweful motor so you have an opportunity to upgrade)

Title: Re: my first board!
Post by: airman00 on July 13, 2008, 06:04:09 PM

Quote from: paulstreats on July 13, 2008, 04:57:49 PM

fist......oscillato ....capacito...seial.....woking,....poweful

having trouble with the R key on your keyboard paulstreats?

Title: Re: my first board!
Post by: Private Reid on July 13, 2008, 09:21:45 PM

The board looks nice and tidy

Quote from: airman00 on July 13, 2008, 06:04:09 PM

Quote from: paulstreats on July 13, 2008, 04:57:49 PM

fist......oscillato ....capacito...seial.....woking,....poweful

having trouble with the R key on your keyboard paulstreats?

Lol that happens to my "A" key so i have learnt to push slitely harder on it now  :)

Title: Re: my first board!
Post by: junior000 on July 13, 2008, 10:21:14 PM

hi ppl,

  thanks and its nice to hear that the board is good.i ll start my work right away :)
 
  well to use internal interrupts do i have to add something to the board.i mean if i have to use PWM i won't be having problem right?

Title: Re: my first board!
Post by: paulstreats on July 14, 2008, 07:38:32 AM

Quote

having trouble with the R key on your keyboard paulstreats?

Theres a pice of grit underneath my buttons, It chooses a different key to obstruct everyday. I think its intelligent and knows exactly what its doing  ;D

Title: Re: my first board!
Post by: polar bear6 on July 16, 2008, 12:24:46 PM

to stay on topic:
you can use a screwdriver or a knife to pry out the buttons, i had to do it with all my keys cos the keyboard was full of shenanigans.
good way to learn where which buttons are too lol.

Title: Re: my first board!
Post by: Admin on July 25, 2008, 09:14:21 PM

Quote

i would do are to change the crystal oscillato to a ceramic one thereby removing the need for any capacito on it

The ceramic type has a higher error rate, and could cause you problems with the UART. I recommend the xtal.