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[solved]18f4550 and usb not recognized
hi all, i am trying to interface my 18f4550 pic to the usb but i am getting usb not recognized messagethe connection scheme is equal to the help of the mikroc:http://digilander.libero.it/naimah81/usb/easy_usb.jpgnotice: d- and d+ pins are wrong and i...
Microcontrollers :: 22 Nov 2009 10:24 :: elrayes :: Replies: 8 :: Views: 795
enc28j60 - very precise value for rbias is needed? - solved
i started building an embedded webserver with enc28j60 and atmega16. the circuit is inspired from http://www.tuxgraphics.org/electronics/200611/embedded-webserver.shtml, adapted for atmega16, and with a few additions.i started testing with firmware f...
Microcontrollers :: 22 Nov 2009 3:07 :: Vandal S :: Replies: 7 :: Views: 2574
need some opinions on temperature sensor
i am currently working on a project that will give temperature reading.is there any disadvantage of using microcontroller with built in temperature sensor instead of using external temperature sensor?does external temperature sensor give a more accur...
Hobby Circuits and Small Projects Problems :: 21 Nov 2009 17:24 :: Aeddon :: Replies: 15 :: Views: 1737
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how to know whether microcontroller is working
hi, i am using a development board in which when i am dumping some small programs like glowing an led also it is not working ... i think the microcontroller is not working. so can anyone please tell me how can i identify the problem. especially how...
Microcontrollers :: 21 Nov 2009 12:40 :: shamikrudra :: Replies: 15 :: Views: 861
programming a pic18f hardware
i was handed six pic microcontrollers. three are 18f2550 and three are 18f4550. i am really having a hard time finding a cheap solution for flashing these chips. seems like all the easy circuits to build do not support these usb2 chips. and a lot of ...
Microcontrollers :: 21 Nov 2009 9:45 :: mvs sarma :: Replies: 22 :: Views: 498
uart in msp430
hello,i am writing a uart code to communicate with pc.#include "msp430x23x0.h"void main(void){ wdtctl = wdtpw + wdthold; // stop wdt if (calbc1_1mhz ==0xff || caldco_1mhz == 0xff) ...
Microcontrollers :: 21 Nov 2009 9:11 :: bobcat1 :: Replies: 2 :: Views: 72
pic16f628 pure sine wave inverter circuits
pic16f628 pure sine wave dc to ac inverter circuits i mean practicable circuits, under voltage shut down, a/c change over...
Hobby Circuits and Small Projects Problems :: 20 Nov 2009 20:13 :: hameeds01 :: Replies: 10 :: Views: 4264
pwm pic16f877 problem.
hi all,i am generating a pwm using pic16f877. i had been trying out example code in ccs compiler for setting up pwm. when doing simulation using proteus isis, i cant see any pwm pulse from pin c2. please help. is it the frequency problem? or the head...
Embedded Systems and Real-Time OS :: 20 Nov 2009 16:28 :: ulderico :: Replies: 2 :: Views: 108
latest rf tutorial uploaded
hi all,its been a while but ive managed to upload another tutorial to www.rfic.co.ukthis one is satellite communications and is under the systems & devices section...differential lna almost finished - just need to add some equations for linearity.bye...
RF, Microwave, Antennas and Optics :: 19 Nov 2009 16:08 :: echostar :: Replies: 80 :: Views: 52330
total power down mode current.....
rrent in total power down mode mentioned in datasheet is 5-10 micro-amps.but i am getting around 90 micro-amps. i dont know what is the reason , but i certainly want to reduce it. i am using internal crystal of 7.37m hz. is this is the reason ????not...
Analog Circuit Design :: 19 Nov 2009 5:58 :: mandar_mahajan :: Replies: 3 :: Views: 123
hi friends
im new to this forum and i have a problem in calibrating ad7730.im working on ad7730 evaluation board. my problem is im not getting the required output constantly.upon continous resets, i would see the desired results.i made many changes in programm...
Microcontrollers :: 18 Nov 2009 21:52 :: daviddlc :: Replies: 1 :: Views: 99
piezo elctric crystal degradation
hi,i have a doubt.when a piezoelectric crystal degrades, ideal what parameter of the crystal is causing degradation?is it electrostatic cap of piezo changing? can anyone pls pass on any interesting material on piezo?sita...
Electronic Elementary Questions :: 16 Nov 2009 20:50 :: flatulent :: Replies: 3 :: Views: 102
looking for motherboard repair training ebooks..
looking for motherboard repair training ebooks..thanks for reply.....
Service Manuals, Requests, Repair Tips :: 16 Nov 2009 15:43 :: intersoft05 :: Replies: 11 :: Views: 2408
laptop chip level training in5 full days with motherboard
learn laptop chip level trainingthe first in laptop service training in india• laptop chip level training full day batch • basic electronics, desktop motherboard chip level coursebasic electronics analog digital .block diagram, how wor...
EDA Jobs, Promotions, Advertising :: 16 Nov 2009 15:33 :: intersoft05 :: Replies: 0 :: Views: 102
pic18f2550, c18 - what setting to choose for cpudiv?
pll // prescaler selection bits:plldiv = 1 // no prescale (4 mhz oscillator input drives pll directly)plldiv = 2 // divide by 2 (8 mhz oscillator input)plldiv = 3 // divide by 3 (12 mhz oscillator input)plldiv = 4 // divid...
Microcontrollers :: 14 Nov 2009 22:19 :: hkBattousai :: Replies: 20 :: Views: 648
picpgm lvisp programmer help!
hello everyone!ive a problem regarding the picpgm programmer. ive built the lvisp programmer. picpgm detects the programmer but not the pic. ive tried two pics uptil now and they are pic18f4550 and pic16f877 but none could be detected. ive checked t...
Microcontrollers :: 14 Nov 2009 19:41 :: picpgm :: Replies: 6 :: Views: 372
low cost power line communication
hi!i am salma,working on power line communication.trying to develop low cost am amr with plc.using tda 5051 plc modem and microcontroller 89c51.crystal required for tda is 7 mhz and for c51 is 12 mhz, how can i interface tdawith c51 to generate cloc...
Microcontrollers :: 14 Nov 2009 18:34 :: myselfsalma :: Replies: 2 :: Views: 78
pic18f4550 pwm with a pc fan
i was trying to make a speed controller for a pc fan, and encountered a rather odd problem. ive calculated and set up the pwm module the way the datasheet describes it: 4mhz crystal, pll-ed and postscaled to 48mhz for the cpu, pr2 set to 0xff (giving...
Microcontrollers :: 13 Nov 2009 18:48 :: jumper2high :: Replies: 6 :: Views: 198
communication atmega 8535 with rs232
i want to connect the 2 micro controller . atmega 8535 i used to take temperature data in some remote place. while 89s52, i use to view data and controls all atmega 8535 ( 10 pcs). can anyone provide solutions for data communications between atmega ...
Microcontrollers :: 13 Nov 2009 16:06 :: dimas_lilik :: Replies: 5 :: Views: 216
gausian distribution in matlab
hi all, i am working on photonic crystal slab waveguide having line defect and want to work on structural losses in it using matlab. i want to include gaussian distribution disorder into my structure. i was wondering if someone could help me how i ca...
RF, Microwave, Antennas and Optics :: 13 Nov 2009 13:28 :: mya21 :: Replies: 0 :: Views: 39
i have all the codes:fdtd scattering matrix
helllo, i have all the codes: fdtd(1d,2d,3d),plane wave mothod and scattering atrix(2d,3d) codes. now i mainly deal with the photonic crystals. every one can contacts me.xshsren@126.com...
Electromagnetic Design and Simulation :: 13 Nov 2009 10:26 :: Mei :: Replies: 24 :: Views: 4506
pic 16f84a uart problem
hii am using mikroc to program my 16f84a as u know it doesnot have a hardware uart pins so i am using the soft_uart library provided with mickroc ( it is the same provided with mikrobasic and mikropascal ) i have programmed the pic with a simple test...
Microcontrollers :: 12 Nov 2009 21:53 :: minep :: Replies: 5 :: Views: 1839
problem interfaceing pic18f2550 and ks0108 lcd
ive been trying to interface 18f2550 and a 128x64 pixel graphic lcd for weeks. i tried several libraries found on the web, but none of them made the lcd print a single pixel on the screen. im really stuck at the moment, and i need guidance and new id...
Microcontrollers :: 12 Nov 2009 21:09 :: hkBattousai :: Replies: 3 :: Views: 510
ad7730 and crystal freq. is it critical ?
please friends.does the crystal freq. (4.9152 mhz) is a critical factor for the ad7730, coz im getting no response from the ic and the only thing which could be the error is that im using (4mhz) crystal.thanks in advance for the help....
Professional Hardware and Electronics Design :: 11 Nov 2009 13:57 :: paurelian :: Replies: 1 :: Views: 99
altera up2 board - getting 19.2khzclock for uart
eh everyone i am new to verilog and i am doing uart on cpld i want to use a baud rate of 1200 so my clock frequency should be 19.2khzthe problem is i only have 25.7mhz crystal on altera up2 boardhow can i write a verilog program to drive this frequ...
PLD, SPLD, GAL, CPLD, FPGA Design :: 11 Nov 2009 8:51 :: wd5gnr :: Replies: 1 :: Views: 117
radiated emission from quartz
hi guys,im new here and i am asking your suggestion to solve a radiated emission problem thats afflicting a device i am working on.i am facing high radiated emissions from a quartz running at 20 mhz frequency (checked that the quartz was the emitter ...
Professional Hardware and Electronics Design :: 10 Nov 2009 19:24 :: FvM :: Replies: 3 :: Views: 90
frequency generator output causing problem
hi,i designed a simple 3 channel frequency measuring unit with pit(82c54) and a microcontroller. it measures the frequency from 3 channels simultaneoulsy and display it in an lcd. i am using the read-back function of pit to indicate the null count. a...
Analog Circuit Design :: 10 Nov 2009 9:53 :: PRAVEEN K :: Replies: 2 :: Views: 108
paper "active control of slow light on.." nature 4
hi.i need this paper of natureactive control of slow light on a chip with photonic crystal waveguidesnature 438, 65-69 (3 november 2005)please help me.thanks...
Electromagnetic Design and Simulation :: 10 Nov 2009 9:52 :: optic :: Replies: 0 :: Views: 42
gsm modem with pic 16f877a
my project is send message from pic to handset through gsm modem..i know we can used hyperterminal and at command..but, how ?what kind of languange can used..c or assembly..what software and compiler need...plz help me...this is my circuit for interf...
Microcontrollers :: 10 Nov 2009 8:56 :: amila133 :: Replies: 17 :: Views: 3270
hemon heart rate monitor
hello,i wish to build the hemon circuit which the schematic is located here: http://web-ee.com/images/schematic.pdf. im having problems understanding the design because of the style in which the author has used. chiefly, the leads on the resistor n...
Hobby Circuits and Small Projects Problems :: 10 Nov 2009 6:15 :: pranam77 :: Replies: 10 :: Views: 1400
cmos logic circuit design uyemura is here
cmos logic circuit design is the perfect way to start your journey into vlsi. this book is crystal clear in explaining the circuits and their working. the reader will get complete satisfaction out of this book http://rapidshare.com/files/21736414/_eb...
Analog IC Design & Layout :: 09 Nov 2009 13:46 :: amir88 :: Replies: 0 :: Views: 66
my experiments with pic18f4550 <> usb
te some time for experiments. at the beginning i took the necessary elements: http://www.sigma-shop.com/e_images/pic18f4550_usb_01.jpg1 pc universal board 1 pc. pic18f4550 1 pc. 40pin socet1 pc 20mhz crystal1 pc usb connector1 pc. 470nf capacitor1 pc...
Microcontrollers :: 09 Nov 2009 5:12 :: maroot :: Replies: 51 :: Views: 22218
square wave generator
i need to design 11.0592mhz square wave generatori need help in thatthanks....
Analog Circuit Design :: 08 Nov 2009 13:26 :: n_huda2006 :: Replies: 10 :: Views: 654
locked atmega ...
is it possible to reset or do something with locked atmega 8. what i mean by locked is that while programming something happened and chip got locked. now i cant erase it, reprogram it or do anything with it. well at least not with standard isp progra...
Microcontrollers :: 08 Nov 2009 13:10 :: ctownsend :: Replies: 85 :: Views: 11926
help: midi keyboard controller mkc
i would like to extend the capability of this mkc from the basic 64 key controller (there is also a 128 key available) to a full 8 octave keyboard...i know somhow we have to add more 3x8 decoder (74ls138) as to make a grid to cover all 8 octave (ful...
Hobby Circuits and Small Projects Problems :: 06 Nov 2009 20:51 :: ron roberts :: Replies: 15 :: Views: 1074
counting pulses of 500ns by 89c55wd
is it possible to count pulses of 500ns using counter in 89c55wd and crystal of freq 12mhz...??...
Microcontrollers :: 06 Nov 2009 15:09 :: nandhu015 :: Replies: 1 :: Views: 75
made a brenner8p (rev-5) usb pic program
i have made a brenner8p (rev-5) usb pic programmer. but when i connect it to the usb port of my pc it says usb device not recognizable. both leds are on. the blinking pattern is not observed. few changes i have made to the board are that bat43 is sub...
Microcontrollers :: 06 Nov 2009 7:26 :: mclarenrulz :: Replies: 2 :: Views: 183
200mhz filter with 200khz bandwidth
i need to design a 200mhz filter with 200khz bandwidth and a very steep rolloff. in particular, i need to expressly reject everything at 200khz intervals from the 200mhz center.active filters are totally fine, and im already using a number of bf998 ...
RF, Microwave, Antennas and Optics :: 05 Nov 2009 21:44 :: Daryl Kemper :: Replies: 4 :: Views: 306
interfacing bluetooth usb dongle with microcontroller
do anyone know how to interface bluetooth usb dongle(which is easily available for pc) with microcontrollers?coz these dongles r easily available n cheaper than bluetooth module so if its possible to interface with ucs than it becomes cheaper bluetoo...
Microcontrollers :: 05 Nov 2009 7:25 :: dannym :: Replies: 115 :: Views: 25014
video pattern generator
video pattern generator with pic16f84 and mc1377...
Hobby Circuits and Small Projects Problems :: 03 Nov 2009 23:57 :: betwixt :: Replies: 23 :: Views: 7577
pll spurious ouput?
hello friendsi designed a pll+vco circuit at 160mhz with lmx2316 and minicircuit vcos and 25mhz crystal osc as ref.output is stable (fcom=20khz,loop filter bw = 1khz),but as shown below have spurs at output near 160mhz carrier.please guide me to remo...
RF, Microwave, Antennas and Optics :: 03 Nov 2009 9:31 :: No one :: Replies: 7 :: Views: 480
at89s52 programmer
hello friends............i am doing my project using at89s52. for this i need to build an isp programmer. i have checked out the one given by asim khan. do u have any other schematics ?please help me out.... i am in great trouble...
Microcontrollers :: 31 Oct 2009 10:59 :: wilson16 :: Replies: 20 :: Views: 3234
crystal vs crystal oscillator differences?
i have not been able to find the stated differences between a crystal and a crystal oscillator.can someone please explain the pros and cons to each of these? what applications would each be better used in?looking at the datasheets it looks as though...
Electronic Elementary Questions :: 31 Oct 2009 6:47 :: Jack// ani :: Replies: 1 :: Views: 159
willman microcontroller programer kit
i need gtp usb and gtp usb-232 schematics, pcb can any one help ? and also want to kno the difference betn these two.thx...
Microcontrollers :: 30 Oct 2009 16:25 :: israel200 :: Replies: 85 :: Views: 42861
plz i need this code urgently
hello every bodymy graduation project is sms remote control,im using t290i ericsson ive tested it with at commands and hyper terminal it works well when i send message to mobile i could read it on hyperterminal.but now i dont know how can i make the ...
Microcontrollers :: 30 Oct 2009 10:13 :: ahmadabad :: Replies: 10 :: Views: 822
friends, help to find out the bug of this charger
guys,ive added the schematic and bascom codes for the whole thing. now i am a bit confused about the reset pin. also i am not sure about the fuse bits for this uc.external crystal at 10mhz. and the whole thing is a 12v charger that will do 13.8v and ...
Microcontrollers :: 29 Oct 2009 18:15 :: aq_mishu :: Replies: 82 :: Views: 3315
pic microcontroller does not work
dear all,i am facing a problem in testing a very simple code with pic16f73.i just want to set the pa0 pin high, so that i can see the led switched on.but unfortunately i cannt see this happening in the hardware.but at the same time i can see the same...
Microcontrollers :: 29 Oct 2009 15:55 :: peacezim :: Replies: 15 :: Views: 621
diy moving message display
hi alli want to have moving message display program for atmel at89c251. may some one help me?...
Microcontrollers :: 29 Oct 2009 11:11 :: madicalphy :: Replies: 565 :: Views: 215053
delay before rf amplifier gives stabilized output gain
hi,i am designing power supply sequencing for rf monolithic amplifier. i want to know the delay time of amplifier response. after switch on the power supply, how many ns that amplifier will take to give stabilized output gain?what are all the paramet...
RF, Microwave, Antennas and Optics :: 28 Oct 2009 16:11 :: vfone :: Replies: 4 :: Views: 168
coil less fm transmeter
any body can prov. me ;coil less fm transmeter; or ;ic based fm transmeter; max 10 meter rang....
Hobby Circuits and Small Projects Problems :: 27 Oct 2009 17:48 :: sajal1975 :: Replies: 5 :: Views: 423
design a helical cavity filter
im run the helical cavity bandpass filter for very narrow bandwidth filter 0.5mhz, and center frequency is 30 or 90 mhz, i have done lots research on this topic, but few materials can be found, and this technology is being used for very long time, bu...
RF, Microwave, Antennas and Optics :: 26 Oct 2009 17:42 :: freeman T :: Replies: 21 :: Views: 1685
i need 12v dc to 220v ac inverter circuit
hi alli need 12v dc to 220v ac inverter circuits.plz give me with small working circuits which r not difficult to make...
Hobby Circuits and Small Projects Problems :: 26 Oct 2009 10:57 :: sajal1975 :: Replies: 44 :: Views: 30090
change the frequency of the transmiter
how can i change the frequency from the external tuning port on this chip???use pin12??or waht??...
RF, Microwave, Antennas and Optics :: 25 Oct 2009 17:14 :: FANT :: Replies: 3 :: Views: 153
bandsolve for metallic pbg
does any body try to calculate metallic photonic band structures using bandsolve? if so, did you see plasmon bands in h polarization?thank you....
Electromagnetic Design and Simulation :: 23 Oct 2009 22:57 :: zhu_yan :: Replies: 20 :: Views: 1593
microphonic problem in frequency synthesizer unit
hi i bought frequency synthesizer unit and i found if i applied vibration to that unit waveform comming out form synthesizer is not remain good .i can see lots of spur during vibration.can anyone suggest me what shoud i do?...
RF, Microwave, Antennas and Optics :: 23 Oct 2009 21:40 :: biff44 :: Replies: 1 :: Views: 69
project to replace cy7c64613 in the icd2
i am evaluating the posibitity to replace the cypress usb on the icd2 with a pic18f2550 or similarreasons for this are:-cy7c64613 seems to be dificult to obtain. -lower price ($20 vs $10). -smd package requires a pcb and more or less skilled solderin...
Microcontrollers :: 23 Oct 2009 17:33 :: SG61-addict :: Replies: 1847 :: Views: 374354
low jitter clock generation with a external crystal
hi folks:we are leaning to design a clock generator with a external crystal. whats the term people use for such kind of circuits?just want to better shoot at the searching. regards,neo...
Analog IC Design & Layout :: 21 Oct 2009 21:23 :: JoannesPaulus :: Replies: 14 :: Views: 603
help me in mikroc usart
hii try to use pic18f452 to send data to hyperterminal but i do notget anything . i user hyperterminal in the mikroc compiler and i putit in the hex display but i do not get any thing may be the mistakecome from code.....can any one tell me what is ...
Microcontrollers :: 21 Oct 2009 10:29 :: amila133 :: Replies: 11 :: Views: 1257
vhf/uhf transmitter- how to change the frequency?
rfmd,rf2514,i want to know how to change the frequency?the dt said ,it can fine-tuned via internal varactor diodes, but when i change the voltage of pin10, the frequency didnt change,,,,,who can help me??thanks...
RF, Microwave, Antennas and Optics :: 20 Oct 2009 17:07 :: Mazz :: Replies: 11 :: Views: 684
go to school at uc berkeley for free
i am a student at berkeley and am also half polish, so it is only natural to want to help you guys! berkeley is expensive, but they are very nice about posting all class notes and homeworks in pdf. if you put effort into learning these courses (eve...
Electronic Elementary Questions :: 20 Oct 2009 10:31 :: jameswong227 :: Replies: 56 :: Views: 11568
supercell method
please all:i am new user of plane wave method. i know that it uses supercell method to calculate the bandgap diagram for photonic crystal fiber.could any one expalin to me this method or seggest me a resource for this methid....
Electromagnetic Design and Simulation :: 20 Oct 2009 10:19 :: abdoeng :: Replies: 5 :: Views: 400
regarind sleep instruction in pic18f452
well i am workiong on pic 18f452, using c18 compiler and using mplab 6.62plz have a look at this code : when i run this code in the simulator and watch on the timer 1 contents, the timer 1l dont increase from 0, and as aresult program never comes out...
Microcontrollers :: 20 Oct 2009 4:34 :: sairasaleem :: Replies: 8 :: Views: 648
warpdrives - ontopic links collection
are there any types of the following devices that implement warpdrives.instrumentation: rf, wireless, microwave, optical, photonic, fiber optic, laser, electromagnetic, plasma, holographic, electro optic, optoelectronic, gps.http://www.google.ca/sear...
Analog Circuit Design :: 19 Oct 2009 22:56 :: betwixt :: Replies: 2 :: Views: 159
a question on the xtal osc deisgn
is a typical cross-coupled oscillator.the negative impedence anlaysis is ok. but i can not make it oscillate.would anyone pls. tell me any wrong with the schematic? is ithis topology suitble for the crystal osc deisgn?thanks in advance...
Analog IC Design & Layout :: 17 Oct 2009 4:05 :: chang830 :: Replies: 13 :: Views: 567
pic volt & amp meterattin6
hello everyone, im looking for any suggestions for a pic controlled dvm to read voltage (0-30vdc) & current (0-10a).... i have on hand some pic16f84s and some tlc0831 adcs i need some help on code (assembly) any ideas or links out there???...
Microcontrollers :: 15 Oct 2009 22:38 :: THANOS10 :: Replies: 53 :: Views: 11158
i need to frequency meter
i need to make frequency meter in 8051....i must use lcd thanks a lot...
Hobby Circuits and Small Projects Problems :: 15 Oct 2009 15:33 :: coolsonia :: Replies: 12 :: Views: 1695
vhf if filter design
hi,im designing an fm broadcast radio receiver front-end as a method to teach myself about rf design. im having some trouble designing the bandpass filter for my if stage.to increase selectivity and eliminate image frequencies, i decided to design a...
RF, Microwave, Antennas and Optics :: 14 Oct 2009 1:24 :: Annirak :: Replies: 4 :: Views: 297
gsm sms 8051 controlling relays
dear friends, ok .. thr is a lot of discussions on sending the sms through mobile phonelets now talk abt receiving sms and making a relay on with 8051 controller. if some one has done anything.. about this using at commands, please share it---> reply...
Microcontrollers :: 13 Oct 2009 16:33 :: vicky89 :: Replies: 54 :: Views: 6391
photonic crystal
hiiiiiiiiiiiiiiiiiii every on iam ms student iam trying to simulate photonic crystal structure can any one advice me which software is good hfss or translight software i need som examples pleasethanks alot...
Electromagnetic Design and Simulation :: 13 Oct 2009 11:07 :: Ashubhu :: Replies: 6 :: Views: 486
rsoft bandsolve problem for photonic crystal
hi,i want to calculate the bandgap of a y-splitter photonic crystal with rsoft. the schematic is attached. the structure is airhole triangular photonic crystal in gaas. the refractive index of the y-shaped waveguide differs from the air holes. does a...
Electromagnetic Design and Simulation :: 13 Oct 2009 11:00 :: samiye :: Replies: 1 :: Views: 123
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