This is
a hobby page of someone with the lowest possible technical education
(automobile an metalwork)
Do not believe everything i say or write, i could be wrong
Dutch is my mothers language and i find dutch hard enough=> so thats
why the scrappy englisch
Micro Something
new!, not so new, but for me it is new
So i bought a Pic16f877 and a programming
device =(+-35)
Euro Would have
been better to buy
pic18f452
wich has the same pin layout Can run at 40mhz and has more
program memory AND Microchip has a C18 C-Compiler
Demo for the 18xxxx series
(all for 1usdollar more)
Pic 18f452 is a
40 pin
microcontroller upto 40Mhz
Clockspeed 10
milion instructions per second
32k FLASH (16K) code
256 bytes EEPROM
1536 bytes RAM
33 I/O pinnen waarvan (8
analoog 10bit A/D),
UART, 3 timers, 2 x PWM, I2C,
Microchip has 60day demo C18 C-compiler for this
18f452 (C-compiler Priced 392 Euro = too much for me)
Farmers explanation of the pic
the pic is a microcontroller
when you buy one its empty/blank and does not do anything
you need to burn a program in the pic microcontroller
this program is a *.hex file human unreadable (like *.exe
on the pc)
hex files are made out of assembler or for example basic pascal c
compilers
assembler is like writing a letter with your feet
practice does wonders
c compilers are much easier
so need to make a program in c compile that to a *.hex file
and burn that program into the pic microcontroller using a programmer
(bit of hardware that connects to the pc and the pic)
and if the program is correct the pic microcontroller wil start running
doing what it is programmed to do => 10 milion instructions
per second
Pinout image 18f452
I like the fact that this
hardware allows Linux, Mac, Windows
or any other
multitasking OS to control steppers via serial line Because timing is done by
the Pic
original (http://cryolite.ath.cx/i/pcb-router)
Windows
program talks to the pic16f877 running at 4mhz at
2400Baud
Would like to make a lot of changes
But that will be hard for me to do => in assembler
So i need a C-compiler
8 maart 2004 => Samples requested http://sample.microchip.com/ Great!!! =>
maadag 29 maart 2004 Microchip 18f452 samples have arived
and 2 hours later the table is moving Forwarded 1 sample 18f452 to Mathijs a
dutch student (wants to make an engraving machine of a
scrap autosampler)
maandag 5 april
got visual basic program working
a little sendig hpgl drawing xy to pic
pic performs these xy motion commands well
PStep_VisualBasic_9_april_2004.zip
Mathijs helped a little how to use mscomm
cannot get 115200baud working on a 10Mhz*4=40Mhz
(maybe because of 4 x error of a 10mhz )
will try a 40Mhz Quartz
so 57600baud is the fastest for now
Some Dutch spraypaint the black back off gravoply red, so he has new
cheap
testing material, Scrooge
Should spend some time to remove freeplay from nut and spindle
Then the result will be much better
Yes sure!?, start with the right depth (see E)
hpgl file outline created with eagle pcb designer Design your board with Eagle then use => file => run
=> outline.ulp (Creates the outline
HPGL plotfile )
or use => file
=> run
=> mill-outline.ulp (more advanced
as outline.ulp) Eagle pcb designer demo
=> http://www.cadsoftusa.com/
some hyperterminal test screens
serial connection the pic18f452 talks to the PC
400thousand (400000 micro)step-pulses => 3 axis interpolating
in 5 seconds
for x 99milion steps => hmmm, whats the use
my table is only 350thousand microsteps wide
but it works well with long
Looks like the Pic performs better as that i had thought
Hate to say it, but i think this is a better setup as the DOS computer
its strange
to watch tv on the pc,
hear that you have new mail,
and are
browsing the internet with 9 mozilla windows
having mplab, acrobat ,hyperterm msvc and a few
other programs running
and still serial exe and the engraving table is running smooth
first messy try
second a little bit better try
in circuit programmer connected to print and
com1 (much easyer re/programming of pic this
way)
pic16f877 upgraded
to 18f452 connected to max232 and com2
i didnt have a 33kohm resistor => thats why the messy series of
3x10k an 1x 3k3 in series
so the setup is as next
a windows computer
connects via com 1 and com2
to programmer and pic16f877 upgraded
to 18f452
because there is a free c compilerdemo for 18f452
and this compilerdemo is not crippled to int => allows longint
the pic16f877 (upgraded
to 18f452)connects
3steppulse and 3direction lines to 3 axis
stepper
driver
and the 3 axis stepperdriver connects to the xyz engraving table
low
cost PIC
Development boards PIC 18f452 development board PIC
Development Package
=>
http://www.sparkfun.com/shop/index.php?shop=1&itemid=173 OR http://www.olimex.com/dev/ I cannot get it to work with the
programmer included
and the programmer is awfull slow
and i get a lot off times verify errors
so make the delays longer and programming takes more time (verry slow) They call it in circuit
programer => but you have to disconnect all before you can start
programming
so the http://www.voti.nl wisp programmer is better/faster then
this one (but has an uglier user interface dos command) but advance is it doesnt freeze
your windows
added 9pin sub d info
why 10=t2in and 8=r2in connected to ground?
part of schematic of original http://cryolite.ath.cx/i/pcb-router
zip file on that page http://cryolite.ath.cx/pics/pcb-router.zip
PIC pcb Drill
http://www.elex.camosun.bc.ca/programs/2001/PCBDrillTable/drilltable2.htm
MAX233 better as MAX232
The dallas
ds275 has
less pins and NO external capacitors
