Battery Vehicle Society

Posted: **Mon Jul 30, 2012 7:33 am**

Thanks alot Greg,

Do you know what sort of accuracy iteadstudio can make the boards to? Have you ever had any trouble with the tracks being too close?

Dan

Posted: **Mon Jul 30, 2012 8:09 pm**

I've not had a problem, but if your layout is very tight you might want to have a look at this goof from itead, but it was over a year ago, it may be better now. http://www.eevblog.com/2011/03/11/eevblog-155-itead-studio-pcb-prototype-goof/

Or you could send a test board and see how it goes. It's around £10 for 10 5x5cm boards. Mine have been dispatched, so I might see them this week, hopefully no later than next week. I'll post pictures.

Posted: **Fri Aug 03, 2012 9:40 pm**

Postman Pat delivered my boards today!

: USB connectors at top for daisy chaining from master to slaves. At the bottom, DB15 for cell voltages and RCA connectors for temperature sensors.; DSC_0011.JPG (186.16 KiB) Viewed 21982 times

I've ordered the rest of the components for Monday.

Posted: **Fri Aug 03, 2012 9:55 pm**

Excellent work Greg, that looks like a nicely laid out board.
Fingers crossed with the 6802 though, 0.5mm pin separation ain't gonna be easy!
Mike

Posted: **Fri Aug 03, 2012 10:34 pm**

I'm saving the 6802 for last. :shock:

First thing will be to get the pic on and test master and slave busses with simulated cell readings in software.

Posted: **Sat Aug 04, 2012 5:15 am**

You are really getting the hang of that pcb layout program now!!

Posted: **Sat Aug 04, 2012 3:24 pm**

Nice and tidy work Greg, I'm salivating :lol:

. What width did you make the traces going to the LTC6802?
I'm using 0.2mm but I've never done them as narrow before and I'm flapping a little about it.
Are you hand soldering? Are your caps and resistors etc 0805 packages? Hope you've bought a flux pen!

Derek

Posted: **Sat Aug 04, 2012 5:14 pm**

They are 0.2mm. I will be hand soldering, but I've made the pads on the 6802 longer than normal which should help make things a bit easier. The resistors are 0603. For the caps I am using 0603 for 100nf and 0805 for 1uf.

Posted: **Sat Aug 04, 2012 10:19 pm**

retepsnikrep wrote:You are really getting the hang of that pcb layout program now!!

I'm pleased with it, and as long as I am trying new things heres a small program to flash the leds on the board. Just a quick test program to check ICSP and basic operation.

Code: Select all

-- ------------------------------------------------------
-- Title: Blink-a-led of the Microchip pic16f886
--
-- Author: Rob Hamerling, Copyright (c) 2008..2010, all rights reserved.
--
-- Adapted-by: Greg Fordyce on 4 Aug 2012
--
-- Compiler: 2.4o
-- Revision: $Revision: 2760 $
--
-- Original file is part of jallib  (http://jallib.googlecode.com)
-- Released under the BSD license (http://www.opensource.org/licenses/bsd-license.php)
--
-- Description:
-- Sample blink-a-led program for Microchip PIC16f690.
--
-- Sources:
--
-- Notes:
--  - Original File creation date/time: 14 Mar 2010 14:33:00.
--
--  A small program to quickly test the 6802 slave board.
--  Red and Green leds should flash alternatly.
-- ------------------------------------------------------
--
-- ******************** Compiler Results *********************************
-- Errors :0       Warnings :0
-- Code   :76/8192    Data:4/352  Hardware Stack : 0/8  Software Stack :96
-- ***********************************************************************

include 16f886                      -- target PICmicro
--
-- This program uses the internal oscillator at 8 MHz
pragma target clock 8_000_000       -- oscillator frequency
-- configuration memory settings (fuses)
pragma target OSC  INTOSC_NOCLKOUT  -- internal oscillator
pragma target WDT  disabled         -- no watchdog
pragma target MCLR external         -- reset externally
--
enable_digital_io()                 -- make all pins digital I/O
--
OSCCON_IRCF = 0b111                 -- set internal oscillator for 8 MHz
--
-- Specify the pin to which the LED (with serial resistor!) is connected:
alias   red_led      is pin_A0
pin_A0_direction =  output

alias   green_led      is pin_A1
pin_A1_direction =  output
--
forever loop
   red_led = on
   green_led = off
   _usec_delay(250_000)
   red_led = off
   green_led = on
   _usec_delay(250_000)
end loop
--

You may have noticed this isn't pbp. :shock:

JAL is open source and free. We'll see how it goes. Program complies with no errors, but is untested.

EDIT: Jal home page is at http://www.casadeyork.com/jalv2/

Posted: **Mon Aug 06, 2012 11:52 pm**

Just tried soldering a couple of boards and have a problem with the ICSP. When I plug it in the pic overheats and won't program. Anyone see a problem with the schematic? http://www.batteryvehiclesociety.org.uk/forums/download/file.php?id=336

EDIT: Found the problem got pins 1, 2 and 3 in the wrong place.

I'll make an adapter and start on a list of corrections for the next board. :shock:

Battery Vehicle Society

LTC6802 based 12 cell slave.

Re: LTC6802 based 12 cell slave.

Re: LTC6802 based 12 cell slave.

Boards have arrived!

Re: LTC6802 based 12 cell slave.

Re: LTC6802 based 12 cell slave.

Re: LTC6802 based 12 cell slave.

Re: LTC6802 based 12 cell slave.

Re: LTC6802 based 12 cell slave.

Re: LTC6802 based 12 cell slave.

ICSP problem