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interfacing pic18f2550 to labview 7.1 or later
hi im new to microcontroller but im expert in labviewso is there anyone help me in finding out how to interface pic18f2550 to labview using usb.thanksbye[/b]...
Microcontrollers :: 21 Aug 2009 1:53 :: Osolong :: Replies: 18 :: Views: 7850
ps/2 mouse communication issue
dear alli am interfacing ps/2 mouse with pic 18f452....i have sent all the initial commands to mouse ie reset (ff from pic and i get fa,aa and 0 from mouse),then i send remote setting command and i get fa from mouse,then i send enable command and get...
Microcontrollers :: 20 Aug 2009 15:52 :: akvii :: Replies: 2 :: Views: 363
light and heavy holes and e-k diagrams
what are heavy and light holes???? and whats crystal momentum???? and can sumone tell me this.... is it possible to have an an e-k diag where e=0 when k=0? ok now ive seen that diag....now es k.e,ok?? but then in some other diags,they show that when ...
Electronic Elementary Questions :: 20 Aug 2009 6:47 :: timof :: Replies: 1 :: Views: 278
through-hole or surface mount crystal?
o be home long enough to finish it i guess i should get it fabricated. however, one thing needs to be decided before i order it and that is whether or not i should use a through-hole or surface mount crystal.originally i was going to just use ......
Hobby Circuits and Small Projects Problems :: 20 Aug 2009 5:25 :: doraemon :: Replies: 5 :: Views: 385
building the pickit2 from scratch
microchip has offered the schematic here :http://www.microchip.com/stellent/idcplg?idcservice=ss_get_page&nodeid=1406&ddocname=en023805from what i gather, the firmware is also available here.so, before i build it myself, i would like to know if anybo...
Microcontrollers :: 20 Aug 2009 0:40 :: CanaKit :: Replies: 37 :: Views: 16236
help needed in generating pwm signal using atmega8
hi guys,i am using atmega8 µc. i want to generate a pwm of 1mhz frequency.so can any one help me in programing in assembler.thankyou...
PC Programming and Interfacing :: 19 Aug 2009 9:07 :: pepakpan :: Replies: 5 :: Views: 1072
help on bandgap of photonic crystal slab on soi substrate
hi,everyone,im doing some research on 2d photonic crystal slab based on soi substrate. i know that the bandgap of it can be calculated by pwe and supercell method. but i dont know how to solve it by matlab? how to define supercell? how to calculate t...
Electromagnetic Design and Simulation :: 19 Aug 2009 3:20 :: bhuvneshwer :: Replies: 22 :: Views: 3076
bb0703+,pickit2 with buck/boost circuit&upto 256k eeprom
the new released bb0703+ family (bb0703+128k and bb0703+256k) has the following enhanced features to pickit 2:1. usb buck/boost circuits, guarantee internal +5v supply at all usb normal voltage inputs situation (4.1v to 5v normal), this will secure h...
Microcontrollers :: 17 Aug 2009 22:43 :: funnynypd :: Replies: 40 :: Views: 3684
can i generate a pwm frequency of 5hz using pic16f877
the lowest possible pwm frequency using a pic16f877. ive tried using maximum values for pr2(i.e 255) and to slow down timer2 with a prescale option of 1:16, but i can only go down to 247hz.im using a crystal oscillator of 4mhz and assembly as a progr...
Microcontrollers :: 17 Aug 2009 22:25 :: millwood :: Replies: 15 :: Views: 705
usb blaster download cable design, need help!
hi, i want to make a usb blaster download cable for altera fpga. could you please give me some suggestions or schematic? thanks.air2008...
PLD, SPLD, GAL, CPLD, FPGA Design :: 16 Aug 2009 19:19 :: uyouta11 :: Replies: 104 :: Views: 48430
photonic band simulation, mpb
i have to simulate photonic band gap in photonic crystal for slow light.as i searched the net, may be mit photonic band (mpb) can be usefull,but as i am new about linux (unix), realy i dont know this software can be helpfull for my propose or not?any...
Linux Software :: 16 Aug 2009 19:07 :: Sohrab_Tapar :: Replies: 4 :: Views: 848
at89isp programmer cable
please , i need a at89isp programmer cable pinout because the pdf manual in atmel web site are not complete. i use it with at89s52. <--pc lpt-------to--------userboard microprocessor-->thanksfrigo...
Microcontrollers :: 13 Aug 2009 20:11 :: ark5230 :: Replies: 104 :: Views: 67797
ftdi - ft245bm & microchip - pic16f877a?
hello,i am developing a board which consist of these two ics. i do not know which brand of crystals oscillator to buy? i know the setup for the ftdi chip needs a 6mhz crystal with 2 capacitors and the microchip needs a 20mhz crystal oscillator with 2...
PLD, SPLD, GAL, CPLD, FPGA Design :: 12 Aug 2009 21:59 :: elrayes :: Replies: 3 :: Views: 389
debug_problem
i use mplab ide v8.30 ( debugger: mplab sim, compiler: picc-18_pro_9.61 ),i write a small program (for pic18f4420) just turn on/off leds while using a simple delay function, it compiles fine with build succeeded, but the following error occurred whe...
Microcontrollers :: 12 Aug 2009 7:43 :: eng_rania :: Replies: 3 :: Views: 363
proteus mmc image file help ?
hi all,i want to know how to make a .mmc image file to insert it in a proteus simualtion thanks...
Microcontrollers :: 12 Aug 2009 5:24 :: doraemon :: Replies: 17 :: Views: 2382
pic16f627a mcu usart asynch, spbrg value query
im trying to interface a pic16f627a mcu to a pc (running linux) via an rs-232 serial interface.ive chosen to use the 16f627a as it has on-board usart. presumably the easiest method for comms is for me to use this in asynchronous mode?im a little conf...
Microcontrollers :: 10 Aug 2009 17:16 :: the_merovingian :: Replies: 2 :: Views: 231
need help to make usb icd2clone work ( 4550 & 877a versi
i built the icd according to the info posted by pics there: http://www.edaboard.com/viewtopic.php?t=161641&start=420&sid=1b18e31069a55140f08abe1a5d20b037( top of page 16)i didnt want to pollute the other thread with my struggling so i created another...
Microcontrollers :: 10 Aug 2009 12:19 :: mz_fadhli :: Replies: 70 :: Views: 13614
problems measuring time between two pulses
just for fun im trying to make a digital rpm meter for my car. but im not able to get exact readings.i have measured with an oscilloscope that there should be ~0,06802721 sec (14,7hz) between the pulses when my engine is idling. tmr_count in my sourc...
Microcontrollers :: 09 Aug 2009 15:24 :: zanor :: Replies: 2 :: Views: 240
how can pic16f84a blink a led without external oscillator
can pic16f84a blink a led without an external oscillator or control a lcd without one?how can i do that if that is possible?thank you....
Microcontrollers :: 08 Aug 2009 17:57 :: wp100 :: Replies: 11 :: Views: 270
anyone can help me on fdtd...
anyone have fdtd code for photonic crystal.please send me on my email: bhuvneshwer@yahoo.co.in...
Electromagnetic Design and Simulation :: 08 Aug 2009 14:33 :: bhuvneshwer :: Replies: 0 :: Views: 159
anyone have the pwe manual of dr. shangping guo?
i have download the pwe codes for pbg calculation of photonic crystals. but i cant find the pwe manual. anyone can paste it here?thanks!...
Electromagnetic Design and Simulation :: 08 Aug 2009 2:53 :: bhuvneshwer :: Replies: 16 :: Views: 2586
short version of help for the icd2
hi guys and newbies,i started this thread because i cannot see any of you guys trying to build the icd2 reading 55 pages and then try to figure out what and where to go with this.i will post what i have but does not guarantee it is the latest. so if ...
Microcontrollers :: 08 Aug 2009 2:36 :: mz_fadhli :: Replies: 46 :: Views: 8780
build easy mplab-6 icd-2
this is an in-circuit-debugger compatible to microchips new mplab-6 ide (icd2). it was designed to use as few as possible and only common parts while providing basic functionality sufficient for home use. http://www.stolz.de.be/sar...
Microcontrollers :: 08 Aug 2009 2:34 :: mz_fadhli :: Replies: 226 :: Views: 114111
8051 square wavw
oscillation using uc8051 with fixed duty cycle say 50% but i want to be able to change the frequency of oscillation from 1hz to 2khz by keying in the required value and make the uc generate it. 12mhz crystal oscillator is used. pls, i need help on ho...
Microcontrollers :: 06 Aug 2009 9:37 :: osoenbolsa :: Replies: 3 :: Views: 243
sync 2 usart at the same time
im using dspic30f3014 mcu, mikro c compiler. my problem is im trying to connect cmucam(rx tx) to uart1(tx rx) and then using the uart2_write_char(uart1_read_char()); codeto transmit the data to uart2 to pc. my problem is when transmit to uart2 the ou...
Microcontrollers :: 06 Aug 2009 8:30 :: YAWN :: Replies: 0 :: Views: 126
how can you set sampling rate of an adc?
hi all,i have been searching about sampling rate setting of an adc.what is the main criteria (or criterias) of its operating rate? clock frequency, equipments time delays, or what?please, would you like to explain how does manufacturer set this and h...
Digital Signal Processing :: 05 Aug 2009 22:47 :: haydaa :: Replies: 10 :: Views: 889
18f delay_us problem
hi all,i having a problem to generate a 1us delay in my program. details:ic - 18f4550crystal - 4mhzcompiler - c18i am able to generate 1us by calling function delay1tcy() 12 times. but i convert it to for..next to run 12 times, it will generate longe...
Microcontrollers :: 05 Aug 2009 6:59 :: wcgan :: Replies: 2 :: Views: 411
how to write code for 4 digit 7 segment display using c lang
hi , any one know how to write 4 digit 7 segment led display with multiplexing approach for pic18f2480 plz guide meregradsr.anandaraj...
Electronic Elementary Questions :: 05 Aug 2009 3:46 :: Anandarj :: Replies: 2 :: Views: 834
usb - max3421e enumeration transfers
hi, im implementing the max3421e in host mode with a small microcontroller, and using the maxim c code for guidance. ive managed to transfer the detect device and detect device removal routines for my microcontroller, and now need to write the enumer...
Embedded Systems and Real-Time OS :: 03 Aug 2009 21:29 :: GetDeviceInfo :: Replies: 12 :: Views: 664
unidirectional analog switch/buffer
hii am using an external crystal to supply clock to pic microcontroller and am using xtal out(12mhz) of microcontroller as an input clock of an other microcontroller and everything works fine.problem starts when the second microcontroller is plugged...
Microcontrollers :: 03 Aug 2009 11:02 :: wp100 :: Replies: 1 :: Views: 222
about clock of msp430
hi guys,i wrote the following code://*************************************#include <msp430x14x.h>int main( void ){ // stop watchdog timer to prevent time out reset wdtctl = wdtpw + wdthold; p1dir=0x01; p1out=0; while (1) { p1out^=...
Microcontrollers :: 02 Aug 2009 14:11 :: doraemon :: Replies: 3 :: Views: 426
i want to build a pic development board.
i have been using a pic18f4550 to teach myself how to program microcontrollers and how to build circuits. i just have it in a breadboard and wired a icsp header, a little lm1705 power supply and a crystal with the requisite caps. problem is that tho...
Microcontrollers :: 01 Aug 2009 4:42 :: funnynypd :: Replies: 9 :: Views: 804
need help on the atmega32
roller i am going to burn.what does this mean to disable the jtag interface it my first time i only progam pic.programming the atmega32burn the atmega32 with avr_oscilloscope.hex and select external crystal at the fuses section.after that, you must ...
Microcontrollers :: 31 Jul 2009 23:25 :: rank900 :: Replies: 2 :: Views: 225
pic18f and watchdog timer?
hello guys,i am a beginner with microcontrollers and need some advice on how to implment this power saving feature.i need to put the 18f series pic device to sleep and wake it up ever 20 ms to check the state of various inputs. the main reason for th...
Microcontrollers :: 31 Jul 2009 16:56 :: M3GAPL3X :: Replies: 16 :: Views: 1560
at89c5131
i have put the at89c5131 in isp mode..i have install flip.now i my laptop cannot recognise the at89c5131 yet..i follow the flip steps open the device manager and choose the directory to install the driver manually..but, still my laptop cannot find a ...
Microcontrollers :: 29 Jul 2009 17:19 :: xylon89del :: Replies: 7 :: Views: 393
help identifying breadboard-like part for pcb
hey! im designing a project in which i want to use a strip of holes in which you can push a wire, just like a breadboard. i am having trouble identifying what should be used for this. should i use a straight female pin header (but they have no spring...
Hobby Circuits and Small Projects Problems :: 29 Jul 2009 16:08 :: wp100 :: Replies: 9 :: Views: 318
how clk timming affects a design in fpga?
hi friends!, im doing a qpsk communication project.and using virtex-4,xilinx ise8.2i. my adcs and dacs require 100 mhz as clk input in order to work. in our circuit,we have not provided a separate crystal or oscillator for adc\dac in pcb. so while p...
PLD, SPLD, GAL, CPLD, FPGA Design :: 29 Jul 2009 7:01 :: xtcx :: Replies: 0 :: Views: 120
oscillator design in sa602
hi,i am trying to use sa602 to design a mixer/osc mainly because it is readily available and popular. the main problem i have is the oscillator design. the data sheet does not have much information on how to design the oscillator. my goal is to desi...
RF, Microwave, Antennas and Optics :: 29 Jul 2009 6:33 :: ekhorasan :: Replies: 5 :: Views: 369
pic12f508 with internal oscillator
hello,i want to use pic12f508 without external crystal osc.i have read from datasheet bit 1-0 fosc<1:0>: oscillator selection bits10 = intrc = internal rc oscillatorcan i select internal osc by setting above bits in configuration word for pic1...
Microcontrollers :: 28 Jul 2009 20:35 :: wp100 :: Replies: 1 :: Views: 177
why is odd overtone more efficient in a crystal's operation?
ive read in a book that a crystal set to work in its odd overtone is more efficiently operated compared to that of its even overtone. if anyone can explain it to me in detail, or provide a link that provides a detailed explanation, it would really be...
Electronic Elementary Questions :: 28 Jul 2009 8:36 :: FvM :: Replies: 3 :: Views: 225
delay in pic
hii use delay(1000) of mikroc in the programming pic18f452 but the problem the pic wlll not delay correct and i see sometimes if the voltage of pic between 5v and 6v thepic will give you correct delay if more or less than this the pic will ...
Microcontrollers :: 27 Jul 2009 14:06 :: the lion :: Replies: 10 :: Views: 612
need ur help in my gsm modem project
dear friends,there is a lot of discussions on sending the sms through mobile phonelets now talk about receiving sms and making a relay on with 8051 controller.now> im trying to connect my 8051 u.c wz the t28 ericsson mobile phone to make a smart syst...
Microcontrollers :: 27 Jul 2009 11:52 :: yasir9909 :: Replies: 4 :: Views: 1041
debug this code...if possible
kindly debug the following code if u can:its about a counter which counts feed_in pulses for 1sec. the clock used as a reference is 50mhz.library ieee;use ieee.std_logic_1164.all;use ieee.numeric_std.all;use ieee.std_logic_unsigned.all;entity feedbac...
PLD, SPLD, GAL, CPLD, FPGA Design :: 26 Jul 2009 11:39 :: VSMVDD :: Replies: 11 :: Views: 1083
how i am convert asm to hex file for 89c51 atmal help me
:?::?:how i am convert asm to hex file for 89c51 plz................]...
Microcontrollers :: 24 Jul 2009 19:44 :: Micro Lover :: Replies: 6 :: Views: 924
vga controller board.
hi everybody.i want to design a board that drives a vga display.i have searched so much for a vga controller, but i couldnt find anything unfortunately. is there anyone that can help me or suggest any chip or any method to me for designing such a sys...
Professional Hardware and Electronics Design :: 24 Jul 2009 11:24 :: itaig :: Replies: 5 :: Views: 859
comport speed
hello,in the context of a low data rate project i need to know what is the lowers com (rs-232) port speed. the hyper terminal has 110bps as a lowers speed but i need something like 8bps.can i set this value arbitrary in my program or there are some s...
Electronic Elementary Questions :: 23 Jul 2009 9:42 :: neazoi :: Replies: 12 :: Views: 471
power supply problems - l7805 on breadboard
ok i have a 240v to 6v ac transformer. it has a maximum current output of 1.2a.i connected it to a diode rectifier and it produces 6.45v dc. when i connect this to my micro controller circuit, the micro controller doesnt initialize and my circuit doe...
Hobby Circuits and Small Projects Problems :: 22 Jul 2009 11:35 :: JoKKeR :: Replies: 18 :: Views: 666
attiny 2313 programmer
hi,i need simple programmer (hardware and software) to program attiny2313 - 20 mhz,regards...
Microcontrollers :: 21 Jul 2009 10:08 :: astina76 :: Replies: 31 :: Views: 10530
propagation constant in photonic crystal waveguide - comsol
hi all,how can i calculate propagation constant in a photonic crystal waveguide with comsol?thanks in advance...
Electromagnetic Design and Simulation :: 20 Jul 2009 15:03 :: elifelite :: Replies: 0 :: Views: 210
retrieving the refractive index
is there any simple matlab code to retrieve the refractive index for a metamaterial structure ?...
Electromagnetic Design and Simulation :: 20 Jul 2009 14:19 :: sandeep_voore21 :: Replies: 46 :: Views: 4895
about pll loop bandwidth....
dear all : i have some questions about pll loop bandwidth. 1. if decrease loop bw , in band phase noise is increase , right ? 2. if decrease loop bw , vco phase noise cant sppress , right ? ...
RF, Microwave, Antennas and Optics :: 20 Jul 2009 10:41 :: biff44 :: Replies: 17 :: Views: 1830
rtc with pic18f4550 in c++
how to make a real time clock with pic18f4450 in c++? i dont understand the interrupt concept that used in this application....
Microcontrollers :: 19 Jul 2009 23:45 :: hugo :: Replies: 1 :: Views: 528
max3100 problem!
i have some problems interface with max3100 through spi. i used spi of pic18f4620 to interface with max3100 and connect the pins tx,rx of max 3100 to rx,tx of pic respectively. i successfully write and read the configuration register. for the write d...
Microcontrollers :: 19 Jul 2009 21:31 :: wp100 :: Replies: 1 :: Views: 153
variable frequency from input button
lation using pic16f873a with fixed duty cycle say 50% but i want to be able to change the frequency of oscillation from 1hz to 1mhz by keying in the required value and make the pic generate it. 20mhz crystal oscillator is used. pls, i need help on ho...
Other Design :: 19 Jul 2009 12:47 :: smd_lover :: Replies: 1 :: Views: 365
icd2 compatible/clone for 18f4550
hi all,i am looking for an icd 2 clone/compatible in ebay.what do you suggest me?thanks in advance...
Microcontrollers :: 18 Jul 2009 11:54 :: mailken :: Replies: 55 :: Views: 14178
need a help with proteus simulation using 18f4550 usb hid
simply i need my computer to detect a usb connection in proteus my sch as shown http://img254.imageshack.us/img254/7250/31613192.jpg the crystal is 20mhz and i setup usb driversmy simple code is the example at the mikroc projects usb read and wr...
Microcontrollers :: 18 Jul 2009 10:22 :: dodonet :: Replies: 0 :: Views: 378
meep simulation of photonic crystals, loop problem
hi,im trying to write scheme code to use for meep, but i keep running into problems with my loop.first, im trying to create the following geometry: 21x27 rods in the cell, and a single wave guide channel where there are 10 rods with a smaller radius ...
Electromagnetic Design and Simulation :: 17 Jul 2009 2:13 :: amitalon :: Replies: 0 :: Views: 129
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sine lookup table with 16 bit value...
hi,i want to generate sine wave using asm code in 16f877.it has 10-bit adc. data in adc is 16 bit wide.the result will be stored in adresh and adresl.how can i use the sine lut for 16 bit variable or is there any method to implement.if i store the v...
Microcontrollers :: 16 Jul 2009 20:36 :: Tahmid :: Replies: 8 :: Views: 2745
digital clock using 18f4550
hie....i tried to count the second but its not working.i just take a look on some examples that is given in the ccs compiler but my program does not count the second properly. it becomes slow.any body can give me some tips about this?================...
Microcontrollers :: 16 Jul 2009 7:10 :: codewiz :: Replies: 2 :: Views: 255
icd-u40 - circuit and pcb
icd-u40 is a perfect solution for debugging and programming pic. its fully independant from mplab, well integrated in pcw and is quite cheap. it has very advantages vs icd2, at least its faster. here is the circuit and pcb for those who want to make ...
Microcontrollers :: 16 Jul 2009 6:17 :: arash_tah :: Replies: 67 :: Views: 18258
why silicon is used in all aplications then germanium
can u please tell why silicon is used in all applications then germanium...
Analog IC Design & Layout :: 15 Jul 2009 23:09 :: sutapanaki :: Replies: 6 :: Views: 405
pcb layout considerations
hi guys, i have come across with this site that presents some things that need to be understood before doing pcb layouting...http://pcb1001.blogspot.com/...
PCB Routing & Schematic Layout software & Simulation :: 15 Jul 2009 12:10 :: Gundam001 :: Replies: 9 :: Views: 2154
pic16f877a and eeprom 24lc512 problem
hi, im having problems reading and writing a 24lc512 ext eeprom to pic16f877a. i tested using led to see if the eeprom is reading the data that i wrote into it. however the only result that im getting is that the eeprom reads 0xff no matter what data...
Microcontrollers :: 14 Jul 2009 9:19 :: dilraj.n :: Replies: 1 :: Views: 390
test pic microcontroller
i have written a simple led program which makes portb highand leds glow.i am able to program it.but there is no output at portb. what does this mean is the pic working or not....
Microcontrollers :: 14 Jul 2009 0:28 :: codewiz :: Replies: 7 :: Views: 277
best 3d em simulator
what is the best 3d em simulator?regards...
Electromagnetic Design and Simulation :: 11 Jul 2009 22:24 :: emcguy :: Replies: 55 :: Views: 9466
errors and warnings when i want to creat netlist!! please he
hi guys hope to be finei designed my schematic and i want to creat my netlist1)for checking rules i use tools->check rule and i solved all the errors but i still have some warnings like:warning: duplicate pin name gnd found on package ep3c80-pa , u...
PCB Routing & Schematic Layout software & Simulation :: 11 Jul 2009 17:58 :: majnoon :: Replies: 2 :: Views: 201
1 mhz clock generation - need suggestion of oscillator
i have to design a circuit for clock generation. clock frequency is in the range of 1 - 10mhz and the special requirement is stability over temperature (lower then 2%) and tunability of oscillation frequency with 10 bits (step of 500hz).i think that ...
Analog Circuit Design :: 11 Jul 2009 11:57 :: mengcy :: Replies: 5 :: Views: 309
ds1302 rtc interfacing with 8051
hi,c code....
PC Programming and Interfacing :: 10 Jul 2009 10:33 :: Alyaa :: Replies: 6 :: Views: 2722
which microcontroller do you use?
i peek into the world of available microcontrollers and the options are making my head spin! arduino, pic, atmel, etc probably all have different strengths and weaknesses but rather than diligently read piles of spec sheets and applications notes i ...
Hobby Circuits and Small Projects Problems :: 10 Jul 2009 7:29 :: dibagay :: Replies: 43 :: Views: 4365
rs485/pic18f4520-interrupt not firing for all recieved bytes
hello to all forum members, hopefully somebody can point me in the right direction.i have setup a simple pic18f4520 demo board, using a 10mhz crystal. my rx + tx pins are connected directly to a maxim 3080 rs485 transciever. pic port d0 is connected ...
Professional Hardware and Electronics Design :: 09 Jul 2009 15:39 :: GrandAlf :: Replies: 2 :: Views: 318
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