Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Search results

  1. D

    16f882 TMR1 as frequency counter problem

    Hi, I am trying to make a frequency counter using a pic 16f882 . The idea is using TMR1 to measure the pulse period and use it to get the frequency. I am using a 16 MHz crystal so that TMR1 increases every 250ns ( FOSC/4 and 1:1 Prescale Value ) Here is the code : #include <xc.h> //...
  2. D

    USB Trace impedance conundrum

    Hi , I have recently been making a board with a usb connector and FTDI FT232RL. The problem is that i am using a 2 layer board. I used Saturn PCB Calculator , but the traces have to be too big . So , the conundrum is that when i saw the SparkFun USB to Serial Breakout - FT232RL...
  3. D

    very accurate frequency counter

    Hi , i want to build very accurate frequency counter (0.1Hz accurate ) . The range is from ~15 Hz to ~1.5 KHz.I am using PIC and uC , also i am using flowcode , so if any has any sugestion i would be very happy to hear them. P.S Sorry for the bad grammar but English is not my native language.
  4. D

    frequency counter flowcode help

    Hi , so i recently started using flowcode 5 , and i want to make a frequency counter/meter.I found a great example but i doesnt seem to work for frequensys bigger then 18 Hz .I need it to work from 1 Hz to around 1KHz . but it seems that i cant make it going.So if there is a flowcode expert...
  5. D

    LCD PIC menu build help

    Hi , because i wasn't able to find an answer i was hoping you can help.I am trying to build 16x2 lcd menu to change the values of "char",but i dont know how.I need to make the menu and browse it and also to change what the buttons are doing after i come into a submenu so i can change the value...
  6. D

    Launch Control Help !!

    Hi , i found this circuit on the net .. (https://code.google.com/p/ecureverse/wiki/LaunchControl) ...... So my question is how does the hysteresis work , and also how can i make it faster because its little slow for my need , i changed the VR1 with 150K pot, VR3 with 50K adjust VR2 so that is...
  7. D

    potentiometer problem!!

    Hi , does anyone know of a potentiometer that i can control using voltage?
  8. D

    formula convertion problem

    Hi so i have this formula AFR = V*0.228+0.70 .. Where V is the adc value in volts , but i dont know how to convert it into volts and use it in the formula.
  9. D

    spark retard unit for car

    Hi, i want to build spark retard unit for my car but i cant find anything on the internet ..... if there is someone out there who can help me i will be very grateful. The point is to delay the spark for no more than 10 degree
  10. D

    [SOLVED] Help with pulsing signal

    Hi , how can i turn pulsing 12 v signal into continuous 12v signal
  11. D

    [SOLVED] help with simple circuit

    Hi, i need simple circuit for a device which when it is powered it gives out singe pulse (for a 1-2 seconds)
  12. D

    VHF airband radio circuit

    Hi, i plan to build VHF airband radio , more specific 110-180 MHz with an antena placed on my roof , if someone has circuits or links please share. :grin:
  13. D

    lambda meter problem

    Hi, i am planing to build o2 meter for my car using PIC 16FXXX and i don't know how to make it when it reads the voltage in one of the pins (for example RA2) it converts it into the appropriate lambda value. **broken link removed** Here is how it is suppose to convert the analog value , but...
  14. D

    [SOLVED] Problem with project

    Problem with project (gear indicator) Hi , i am making gear indicator, but i cant make the code work properly... i am new to MicroC so i need some help.I am using 7 segment common cathode display and two buttons ,the buttons are connected to PORTA and the 7segment is connected to PORTB. the...
  15. D

    [SOLVED] thyristor replacement

    Hi, i am building a cdi but i cant find one of the parts . Its the btv58 thyristor ,, i've serched in all of the electronic stores in my city and i cant find it, so i decidet to look for its replacement but i couldn't find it either , so if someone can tell me with what i can replace the damn...
  16. D

    Detecting rising edge

    Hi , i'm building a tachometer for school and its using 5v pulses, and i need to : 1 count the rising edges in 1/10 of a second 2 multiply the result by 600 so i get the rev/min 3 display the result on a 16x2 lcd i know how to display the result , but i don't know how to detect and multiply them.
  17. D

    [SOLVED] [Moved] Detecting pulse on PIC pin

    My question is how can i detect a logical "1" on a PIC pin so i can count them over a period of time.
  18. D

    PIC pulse counter code help

    Hi , i need help with the code for my rev counter , since i just started working with PIC's i don't quite know what to write. What i need my PIC to do is : 1. Count the number of incoming pulses in 1/10 second ( number of rev in 1/10 sec.) 2. Multiply that number by 600 (so i can get the number...
  19. D

    PIC16f628a or PIC16f84ap for replacement of PIC16F628

    hi, i am building a cdi unit ( **broken link removed** ) but i am facing a problem , i can't find PIC16f628 nowhere,all i can find is PIC16f628A-i/p , and in the parts list (**broken link removed** ) PIC16f84AP is presented as replacement ,so can you tell me if it will work with either one ...
  20. D

    Proteus problem with simulation

    Hi, i am making a cdi unit in proteus ,but no mather what i do i get the same problems. I have tried using the Proteus VSM help , but that didn't help. Can someone plz help me.

Part and Inventory Search