Repair Zero Error One Second Timer Tutorial

Home > Zero Error > Zero Error One Second Timer

Zero Error One Second Timer

PIC pins; GP0 - outputA GP1 - outputB GP2 - mains freq input, 0v to 5v, half cycle The output pins will drive push-pull FETs etc (like the project above). Often it is difficult to predict the length of time that the timer has continued to run before reloading it with a fixed time value. Genom att använda våra tjänster godkänner du att vi använder cookies.Läs merOKMitt kontoSökMapsYouTubePlayNyheterGmailDriveKalenderGoogle+ÖversättFotonMerDokumentBloggerKontakterHangoutsÄnnu mer från GoogleLogga inDolda fältBöckerbooks.google.se - Focusing on the line of high-performance microcontrollers offered by Microchip, Microcontrollers: High-Performance What would work with limited ROM would be to use 50 small loops, each hardcoded to generate your 50 sinewave PWM values.

The method for generating the voltage steps of the sinewave is optional. It doesn't get any better than that from a zero jitter 50:50 system. It wouldn't take much more then one of my "cycle accurate" fixed delay subsystems (macro and 9 word subroutine) and a simple isochronous loop like this for push-pull square wave output; And MikroC helps a lot because it makes these neat .ASM files so you can inspect the output asm and fine tune your C-- code; Code (text): ; ASM code generated

Implementation. This is a full 2 output push-pull PWM sinewave inverter. Donald Krambeck EU Aims to Supply Free Wi-Fi to Eurozone by 2025 By 2025, the European Union intends to establish free Wi-Fi coverage for all. It also has zero jitter.

However it is optimised for speed and code space, because it uses a 16bit unsigned int variable for bres instead of a 32bit unsigned long. The procedure is basically the same as the project above, but it generates 24 "virtual pulses" per incoming 50Hz mains cycle, not 12. Zero Error Zero Jitter algorithm; (define PERIOD as the period to be generated, in TMR0 ticks) 1. This forum give us a great support : - http://www.picbasic.co.uk/forum/cont...without-RTC-IC - http://www.picbasic.co.uk/forum/show...ht=timer+roman Regards !

Basic Theory Bresenham's algorithm was originally designed for speedily calculating imperfect periods in grid movement on a 2 dimensional matrix like an X-Y Plotter. It is "zero jitter" because the remainder period syncs to the #defined PERIOD so the event (toggle PIC pin) always happens at exactly PERIOD. Generally this code would be used to make a small inverter to drive an antique 60Hz mains clock from 50Hz mains etc. No, create an account now.

It will drive push-pull FETs to make a mains inverter; 10MHz xtal; 50Hz output (same code is used for both) 12MHz xtal; 60Hz output GP0 This second method is perhaps more useful when your counter has to be larger than 255 and it cannot me thought of as the product of two numbers. The int period and 1second period value can both be multiplied by the same number, giving an increase in the timer resolution much greater than the original resolution of the xtal Mike said: ↑ I agree that you don't need a CCP module to implement a jitter free cycle accurate pair of sine wave outputs.

The text includes easy-to-follow sample circuits and their corresponding programs, enabling you to use them in your own work. using TMR0 adjusting. Förhandsvisa den här boken » Så tycker andra-Skriv en recensionVi kunde inte hitta några recensioner.Utvalda sidorTitelsidaInnehållIndexInnehållChapter 1 Basic Electronics1 Chapter 2 Number Systems19 Chapter 3 Data Types and Data Storage33 Chapter This requires a 4MHz xtal to make the precise pulse periods, AND a properly smoothed 12v AC half-cycle waveform (from a 12v AC transformer) to detect the incoming mains frequency.

Author of BTc PIC-sound encoder, Shift1-LCD project, the TalkBotBrain talking PIC controller, LiniStepper open-source microstepping motor driver, the Black Regulator 2-transistor SMPS, and probably some other stuff; www.RomanBlack.com Mr RB, Nov unsigned int pcount; // used in interrupt to count PER_COUNTS unsigned char outputs; // shadow register used to drive output pins unsigned char outcount; // used to sequence the outputs Regards, Mike Last edited: Dec 5, 2009 Mike - K8LH, Dec 5, 2009 #11 Gayan Soyza Active Member Joined: Oct 23, 2006 Messages: 1,812 Likes: 19 Location: Colombo Mr Roman The interrupt does nothing now, as the PWM period is automatic (every 100 instructions) and asynchronous to both the incoming and output mains frequencies.

Of course you would not be limited to 20 sine "steps" as shown here. 20 sine steps allows an easy conversion of 50Hz to 60Hz (freq), which is a conversion of I corrected that typo' in the program listing. Note! Robin Mitchell Windows 10 Hits 200 Million Mark Windows 10 is now running on over 200 million devices.

Teardown Videos Datasheets Advanced Search Forum Digital Design and Embedded Programming Microcontrollers PIC One Second Algorithm from Roman Black + Post New Thread Page 1 of 2 1 2 Last because with this piece of code i had always 0 in TMR0. This page looks like it's becoming a resource for building tiny inverters which is pretty cool.

ansel = 0; // a2d module off, digital I/O trisio = 0b00001010; // GP3 is freq in, GP1 is Cin

So the user can simply set the one simple PERIOD constant to any number of TMR0 ticks, and the software generates an exact zero-jitter period automatcially! However, one consideration...https://books.google.se/books/about/Microcontrollers.html?hl=sv&id=O4XNBQAAQBAJ&utm_source=gb-gplus-shareMicrocontrollersMitt bibliotekHjälpAvancerad boksökningKöp e-bok – 488,94 TRYSkaffa ett tryckt exemplar av den här bokenCRC PressAmazon.co.ukAdlibrisAkademibokandelnBokus.seAlla försäljare»Microcontrollers: High-Performance Systems and ProgrammingJulio Sanchez, Maria P. pulse = 10; // make 10 "fake" pulses TMR1L = (256-104); // prep first 1/1200th sec delay while(pulse) { // wait here for fake 1200Hz pulse while(TMR1L.F7); // now fix TMR1L Our requirements are that you must post at least two messages, to allow the moderators to review your registration, before you will be allowed access to the full range of forum

For example, let's assume the oscillator is 4MHz. but i still have some little problems. I also added a 0.47uF greencap (polyester cap) from GP2 to ground. Unfortunately, since most of these Micros run at crystal speeds like 4MHz and 20MHz, these overflow timed periods generated are binary and cannot be evenly divided into 1 second or any

Then keep your 250 inst TMR2 interrupt, and just inc n and forcibly jump into each timing loop. But this new system generates the period with zero jitter (which many people have requested). My optimisation for the PIC timer0; Using a 3 byte Period variable means it can subtract 256 simply by decrementing the MID byte Instead of going BELOW zero, event is generated Sinewave inverter is definitely superior, but for driving 5 watt clocks with synchronous motors then a modified squarewave will work just as well.