ON 20030501@5:32:42 AM at page: http://www.piclist.com/techref/piclist/questions.htm BRK-stofanet-D83 Bo Riis Toelberg Kristensen Questions: Hello, I'm making a school project with a PIC16F876 where I'm making a traffic counter. I use two contacts so I'm able to log the cars speed also. my problem is that I need to use Timer1 as the other two timers are only 8bit and thus cant measure slow cars without overflow. so the question is: How can I calculate a speed from two registres. (contact distance is 0.3 meters)

Mail: Bo Kristensen

ON 20030504@9:52:30 AM at page: http://www.piclist.compiclist/projects.htm JMN-EFP-786 James Newton removed post 37745.1306828704 |Delete ' hi looking for a project to make a fortune...any ideas' ON 20030505@3:10:32 PM at page: http://www.piclist.compiclist/listfaq.htm JMN-EFP-786 James Newton removed post 37746.1261921296 |Delete 'vesslanpekka@hotmail.com asks:

Searching for an simple extern 20Mhz LC(inductance capacitance) oscilator
design for my 16F877. The idea is to make the oscilation freq dependent
on a moving ferrit bead(moves relatively to a measure analysis) and changes
the inductance/frequency.
I don't want to make an RF(colpits,Hartley) osciltor and then buffer
and squere the signal.(to complicated)
My next stepp is to start wild experimenting with 74o4 logic inverters.
If you do have any kind of advice, Please don't keep me in the dark !

vesslanpekka@hotmail.com

' ON 20030505@3:10:45 PM at page: http://www.piclist.compiclist/questions.htm JMN-EFP-786 James Newton removed post 37746.1321527778 |Delete 'snkdundee@hotmail.com asks:

The PIC I'm using is the 16F628. I connected output pins A2 and A3 to a headphone jack. How can I play a frequency of 500 Hz to the left ear and a 510 Hz or 515 Hz to the right ear?

' ON 20030510@1:25:33 AM at page: http://www.piclist.com/techref/piclist/questions.htm N-BAL-833 RAVINDRA Questions: Hello Everybody,
I need help regarding problem I am facing with application using PIC12F675. The application works fine first time after power on. But after shutdown and subsequent poweron, the application works erratically.
But the same application works fine with PIC12C508A. I am not using interrupt, A/D Converter and Comparator function of PIC12F675 and also using its internal clock.All the I/O's are digital.
The configuration bits have been set as follows:

Oscillator : Internal RC I/O
Watch dog Timer : Off
Power up Timer : on
Code Protect : off
Brown out detect: off
Master Clear : external(same in PIC12C508A application)
Data EE Protect : off

I have done the initialisation of source code as follows:

bcf STATUS,RP0
movlw 07h
movwf CMCON
clrf INTCON
bsf STATUS,RP0
clrf ANSEL
movlw b'00101111'
movwf TRISIO
clrf OPTION_REG
clrf WPU
call h'3FF'
movlw OSCCAL
bcf STATUS,RP0
clrf GPIO

Please advise how to overcome erratic working of application using PIC12F675 after first powershutdown. Is PIC12F675 susceptible to Electro Magnetic Interference?. Thanks ON 20030511@8:23:52 AM at page: http://www.piclist.compiclist/questions.htm JMN-EFP-786 James Newton published post 37750.0870717593 patilyt@rediffmail.com asks:

Hi, I am a beginner in PIC programming.the device is 16f873 and MPLAB IDE 6.10 . when i use IF,MACRO and WHILE in program it can not work properly ,Can anyone give me some solution for my problem .

|Delete 'P-' before: '' but after: 'patrickcarreon@hotmail.com asks: " I was wondering what settings I have to change in MPLAB 6 in order for me to use picc lite with it. Anybody know?" |Delete 'P-' before: '' but after: 'hueyncandi@yahoo.com asks:

my group and i are doin a project involving pic16f877 using a lcd
we want to display some item and when you chose one of thse item it'll lead to another set of the item choose. only problem we have is we can get our program to work. Is there anyone that think they can give us some ideas on how to set our prpgram..
any suggestion will be helpful..thank you

' ON 20030511@8:33:09 AM at page: http://www.piclist.compiclist/begin.htm JMN-EFP-786 James Newton removed post 37747.7047106481 |Delete 'mbr@tinet.fut.es

Questions:

' ON 20030513@5:56:05 AM at page: http://www.piclist.com/techref/piclist/questions.htm pJ-aol-I88 Pat Johnson Says Hi guys! Does anyone have a method schematic and (code) for a PIC controlling a temp sensor for shutting down 120VAC, 20A circuit and perhaps using an LCD to set the over temp limits? accuracy 1 degree F from 100-120 degrees (120v in, 120v out to disable the output if the temp sensed is over the set limit) ON 20030514@2:40:35 AM at page: http://www.piclist.com/techref/piclist/projects.htm code_xnl-yahoo- Questions: Hello,

can someone send me the hex code for the L/C meter IIB .
(http://www.aade.com/lcmeter.htm)
I want the use the PIC16c622.
email:code_xnl@yahoo.com ON 20030514@2:25:05 PM at page: http://www.piclist.compiclist/projects.htm JMN-EFP-786 James Newton removed post 37753.5144907407 |Delete 'kesragul@yahoo.com asks: " hi I'm trying to do an alarm system using 16f874 I need to produce phone tones by using 16f874.plese help me" ' ON 20030514@2:26:39 PM at page: http://www.piclist.compiclist/index.htm JMN-EFP-786 James Newton removed post 37754.2661574074 |Delete ' Is there anyone in Stockholm Sweden that can interduse me in picprogramming, well compensation ..mail to trw32@hotmail.com' ON 20030518@8:48:57 AM at page: http://www.piclist.compiclist/questions.htm JMN-EFP-786 James Newton published post 37759.2999074074 cruzin@access4cheap.com asks:
Hi, I got a serial programer and want to program my 16f628 to move a c-band satellite mount with my solar panels atop. Anyone tell me how hard this is going to be? I think I may have already waisted my first 2 chips as when my ic prog programs starts to burn a chip it asks if you want to enable code protections and I let it do it..are they waisted? thanks, Mark
|Delete 'P-' before: '' but after: 'cruzin@access4cheap.com asks:
Hi, new to pics. just got a serial programer and project board along with a couple 16f628 chips. Want to program a chip that will move my c-band motorized mount with my solar panels atop. I got the programer and put the chip in and thought Id load a program I downloaded from the site where I bought the stuff. After trying to load the blink.hex program it halts and says failed at address 0000H. now I read on this web page that you should never enable code protection. Seems thats the second question my ic prog program asks me..and I let it enable the code protection..is my chip fried now..and can anyone tell me how hard its going to be to make a program that will move my satellite mount every 15 minutes or so to track the sun and send it back to starting position at midnight? thankss for any help. Mark
|Delete 'P-' before: '' but after: 'galvelec@uolsinectis.com.ar asks:
Hi, I am using pic 12f675 and MPLAB574 IDE .I have one trouble with GO/DONE bit on ADCON0 register, in an A/D simulation. This trouble do not exist in PIC 12C671 simulations on the same MPLAB 574 IDE. In this PIC12c671, first it turn ON de ADON bit (bit0). In a next step, it turn ON the GO/DONE bit (bit2). This bit stay ON until A/D conversion is completed.(good!)
However, with the PIC 12F675, the ADON (bit0) always reach the ON state, but the GO/DONE bit (bit1 in 12F675) never reach the ON state in simulation.
I have checked all registers and its bits with data sheet.
Question: this trouble is a human error or a specific limitation of MPLAB IDE for PIC12f675?
Thanks for answering me
Nestor Galvan - Argentina.

|Delete 'P-' before: '' but after: 'bthothela@yahoo.com asks:
I have decided to do a "room monitoring project" using infrared sensors and PIC 16f877 microcontroller.If a person enters or exits the room this should be recorded by the PIC. Also the PIC is to be interfaced to a PC where the user will be able to know whether someone entered or exited the room. For this I am planning to use C++ language. Since I am new to PIC I am confused as to what configuration should I use. Also could you please give me some ideas especially on the coding that would help me in this project. Tumi

Chun Fang Lai asks:
' ON 20030520@4:42:58 PM at page: http://www.piclist.com/techref/piclist/index.htm JMN-EFP-786 James Newton edited the page. Difference: http://www.piclist.com/techref/diff.asp?url=H:\techref\piclist\index.htm&version=140 ON 20030521@3:26:48 PM at page: http://www.sxlist.compiclist/questions.htm JMN-EFP-786 James Newton removed post 37762.4925462963 |Delete 'zahi_bridi@hotmail.com asks:
Hello, i am working on the PIC16F874A, i have a project to do a chronometer that counts till 30 seconds. I am working on PORT C and PORT D. Each time PORT C arrives to 9, PORTD D gets incremented and PORT C restarts from 0 thus giving the result 10. My question is that PORT C and PORT D aren't compatible with TTL (transistor to transistor logic)(I am working with TTL), they are compatible with the ST (schmitt trigger), So is there a certain way inside the software (MPLAB) to let PORT C and PORT D compatible with TTL, if not can u propose for me a good solution because i cannot use PORTB since i am using it for the interrupt basis.

Thank you in advance
Zah
P.S: I have to present my project by the beginning of next week, so please reply to me as soon as possible. Thanks Again.
' ON 20030522@5:44:44 AM at page: http://www.piclist.com/techref/piclist/questions.htm qcdesign-executivemail- Questions: Hi, I am currently using A PIC16F876 to store Dallas iButton information to a 24LC256. I seem to have a problem in the respect that I am storing byte for byte as the iButton get presented. But when I come to byte number 63 it goes ahead and stored Byte 63 at location 0 again and right after that it then goes on with byte 65. I have check my data which I am sending to the chip and I am clearly giving the chip an excellent stop condition after every byte. Has anybody see this before or can someone reccomend proper I2C routines for the 24LC256 chip. ON 20030524@12:01:03 AM at page: http://techref.massmind.orgpiclist/projects.htm JMN-EFP-786 James Newton removed post 37764.4325231481 |Delete 'pchan@email.arizona.edu asks: " Is there any way that a PIC chip implemented as a host instead of device?" ' ON 20030524@12:01:36 AM at page: http://www.piclist.compiclist/questions.htm JMN-EFP-786 James Newton removed post 37764.8232291667 |Delete 'Gregory_Eldridge@yahoo.com asks:
I'm a beginning student using the Motorola 68ch11 training board. I would like to know if any have a basic assembly language programming code to use on a 4x4 keypad with interfacing instructions.

'