The most important part for the accuracy of the frequency counter is the time base setting circuit crystal resonator x1 and capacitors c4 and c5. Additionally, it offers ample room for expansion, making it an excellent solution for. Figure 11 shows a block diagram of the pic16f688 device. Frequency counter by pic16f628 pic microcontroller. Jun 14, 2016 in this project we are building a basic and low cost frequency counter circuit. Posted on january 4, 2011 by rb 38 comments description. Ds40300c page ii preliminary 2003 microchip technology inc.
Pic16f688 block diagram flash program memory data bus 8 14 program bus instruction reg program counter ram file registers direct. Pic16f62820p microchip technology 8bit microcontrollers mcu 3. But i have got the problem, that when i want to have i. This frequency counter contains only a few components. But i wanted to use 7segment led display, not lcd, so i found a second useful project. Microchip, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. In addition, microchips quality system for the design and manufacture of development systems is iso 9001. There is lcf meter project using pic will published in epe mag. Pic16f628a pdf, pic16f628a description, pic16f628a. The firmware controls these components in such a way that.
I am using pic16f877a and the result is displayed on an lcd display. To identify which bit within which port is responsible for driving a particular pic pin, look at the pin diagram below this diagram is only good for the 16f628, refer to other pin diagrams for other pics. In this project we are building a basic and low cost frequency counter circuit. Please do not ask me to send programmed pics or even circuit boards to you, my spare time is too short. You gotta load the lc meter code into it before it will work.
Hamradioindia view topic 16f628a frequency counter. Microchip flashbased 8bit cmos microcontrollers,alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. While the previous section on the pic18f2550 was written in c, here ill use only assembly language related youtube video. Microchip products meet the specification contained in their particular microchip data sheet.
Alas, we didnt find a video, or even a description of the finished project. The pic 16f627 is a fairly good replacement device for the 16f84 as it has a lot of usable built in peripherals but it has the same amount of program memory as the 16f84 i. Microcontrollers pic found difference between 16f628 and. This simple project uses a dallas ds1820 one wire temperature sensor and a pic 16f628 microprocessor. But if i power it off and then power it on again, the offset frequencies are gone. Jan 06, 2009 the pic16f628 needs to be programmed with the firmware below. Digital clock datethermometer with pic16f628pic16f84pic16f690 and ds18s20ds18b20. A simple temperature regulator where a led symbolizes the fan. Pic found difference between 16f628 and 16f628a rochester, 31 augustus 2005. The input signal can be a sine, a square or a triangle waveform.
A pic programmer which you need to program your pic 16f628 is available on dl4yhfs website. Measure the supply current while gradually increasing the voltage. In short, it generates colors using a rgb led, can be controlled using any infrared remote controller compatible with the sony sirc code and has two auxiliary buttons for easy control even without the remote controller. C4 and c5 values can be between 33pf and 62pf and the crystal frequency can be fine tuned with them. A crystal oscillator circuit is built in between pins t1osi input and t1oso amplifier output. If possible, use a variable regulated supply for the first try. This tutorial will help you learn and use timers in pic microcontroller pic16f877a, in our previous tutorials, we have covered the introduction to pic and mplabx ide, then we wrote our first pic program to blink the led. Led flasher pic16f84a led flasher 2 pic16f84a signboard pic16f84a signboard 2. Pic16f877a is enough if you do this project only for testing purposes. Flashbased 8bit cmos microcontrollers, pic16f628a datasheet, pic16f628a circuit, pic16f628a data sheet.
I looked around the forum to see if anything about msf signal decoding had been posted before. Nov 22, 2008 i need some help in a project of mine, for the part regarding timer0 and i am using pic 16f628. Here is a quick overview of the programming function menus. Write a peripheral program to generate precise 1 ms delay. Jul 27, 2005 i am using pic simulator ide from oshonsoft to compile and assemble my code for the 16f628. Feb2004 the meter measures l 1uh 10h c 1pf 6500uf f 0. Led chaser for pic16f84a and pic16f628a pic microcontroller. Companys quality system processes and procedures are for its pic mcus and dspic dscs, keeloq code hopping devices, serial eeproms, microperipherals, nonvolatile memory and analog products. Programming timer0 in pic 16f628 electronics forum. The brain of the unit is a pic 16f84 microcontroller. Corrections to this data sheet we constantly strive to improve the quality of all our products and documentation. Cours pic 16f628 pdf the pic16fa features 4mhz internal oscillator, bytes of eeprom data memory, a capturecomparepwm, a usart, 2 comparators and a. The rest of the hardware is pretty common, a pic 16f628 does the thinking while an l293d hbridge drives the motors.
Posted on november 29, 2011 by rb 31 comments last week i was browsing my old backup hard drive and i found a source code for a very simple pic based digital timer that i made a couple of years ago. The fraction of the period for which the signal is on is known as the duty cycle. Pic basic projects 30 projects using pic basic and pic basic pro by dogan ibrahim amsterdam boston heidelberg london new york oxford paris san diego san francisco singapore sydney tokyo prelimsh6879. Pic16f628 pdf, pic16f628 description, pic16f628 datasheets. Frecventmetru v2 by phil rice vk3bhr mikroelectronica. The 16f628 has 16 io pins these pins are accessed via port a and b. As devicedocumentation issues become known to us, we will publish an errata sheet. Digital clockdatethermometer with pic16f628pic16f84. Heres an awesome diy electronic project for those of you who know some pic programming. The lcd display used is a state of the art, commonly available 16 characters dot matrix in one line unit.
It is enabled by setting control bit t1oscen t1con bit 3. In this section we will explore how to use the microchip pic mostly the 16f628a and the 12f683. Voltmeter and ammeter can be easily made using pic microcontroller having adc analog to digital converter. Simple 100mhz frequency counter which uses 6 digit ledread more. The latest evlution of power pic rgb with infrared remote control is for pic 16f628 lovers. Pic16f62820p microchip technology integrated circuits ics. The separate instruction and data buses of the harvard architecture allow a 14bit wide instruction word with the separate 8bit wide data. Simple example of this process is the digital wristwatch. This kit is a versatile development solution, featuring several options for external sensors, offboard communication and human interface. Microchip pic16f628 assembly code programs tutorial. As mentioned the temperature sensor communicates over a one wire bus that requires only one data line and ground for. It is available in 14pin pdip, soic and tssop packages.
A pc board layout is available, but not quite the most recent. On these pages, i will introduce the pic electronic circuits. Microcontrollers introduction, microcontrollers types and. They allow you to have something happen after a certain period of time, or for some interrupt types, something happens when a button is pushed or a sensor reads a certain. The hardware part is very simple because it only uses pic. It can measure from 16hz to 100hz signals with a maximum amplitude of 15v. An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for curren t devices. The errata will specify the revisi on of silicon and revision of document to which it applies. The actual hardware of the project isnt with me anymore. The schematic is fairly simple and straightforward and uses a pic16f628a. Pic16f628a datasheet, pic16f628a pdf, pic16f628a data sheet, pic16f628a manual, pic16f628a pdf, pic16f628a, datenblatt, electronics pic16f628a, alldatasheet, free.
The explorer 8 development kit is a fullfeatured development board and platform for 8bit pic microcontrollers. Have not tried it in hardware but gpsim shows the correct pin set to an output but it does not have a signal on it. Many times, we plan and build systems that perform various processes that depend on time. The logic level on ra5 pin 4 of the pic 16f628 causes it to change from basic frequency counter mode to offset compensation mode. Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by. Microchip has recently introduced flash chips with types that are much more attractive, such as 16f628, 16f877 and 18f452. The oscillator is a low power oscillator rated up to 200 khz.
The pic firmware for the frequency counter can be downloaded from this link includes hex file for all display variants and the assembly sourcecode. Pic16f628 datasheet, pic16f628 datasheets, pic16f628 pdf, pic16f628 circuit. A single illuminated led walks left and right in a repeating sequence, similar to the effect seen on kitt, the car in the knight rider tv series fully commented source code and programmer ready hex files are provided for the pic 16f84a and 16f628a at the bottom of this page. This has internal comparator, which means the lm311 is no longer needed. Msf clock using a 16f628 and symtrik rf module finding myself with a bit of time to spare, i thought id have a go at writing some proton code to decode and display the time signal from the module. Flashbased 8bit cmos microcontrollers, 16f628 datasheet, 16f628 circuit, 16f628 data sheet. I use timer 0, 1 and 2, the pwm module, the uart and external clock for tmr1. The mplab pm3 universal device programmer is easy to use and operates with a pc or as a standalone unit, and programs microchips entire line of pic devices as well as the latest dspic dsc devices. When used standalone, data can be loaded and saved with the sdmmc card not included.
The frequency is displayed, i have the offsets and i can switch from nor to rev, etc. As you can see very simple and yet elegant schematic. Pic16f628a flash 18pin 20mhz 2kb microcontroller with usart technical data, buy pic16f628a ip. Cant seem to get pwm working, this is my pwm set up routine is below. All pic microcontrollers employ an advanced risc architecture. The windows application is included as an example of how one could control a 2. The finished meter can be calibrated against any accurate capacitor within the range 100pf to about 0pf. Ccs c compiler manual your source for microchip pic. While the previous section on the pic18f2550 was written in c, here ill use only assembly language. Il me semble interessant a plus dun titre par rapport au f84. Frequency counter with pic and 4 to 5digit led display. Pulse width modulation pwm is a technique of controlling the amount of power delivered to an electronic load using an onoff digital signal.
The input of the schematic is feed through a high speed comparator. Pic16f62820p pic pic 16f microcontroller ic 8 bit 20mhz 3. External crystal uses pic16f628 tmr1 generates interrupt. Low voltage programming, low speed clock mode, programmable bor, 4mhz internal rc oscillator, onchip voltage reference. What would be a suitable replacement for a pic16f628, its been out a while now and i spose microchip will be saying if not allready that the device is obsolete. Companys quality system processes and procedures are for its pic. Double check the pic orientation, the diode and the 7805. Pic16f628 microcontrollers and processors microchip technology. The measured frequency is used as an offset value added to subsequent measurements. After i program the pic, insert it in the frequency counter, everything works great. Pic16f628a datasheet, pic16f628a datasheets, pic16f628a pdf, pic16f628a circuit. Desbravando pic 16f628 pdf please consider pic16fa. Understanding timers in pic microcontroller with led. The 16f877 is around twice the price of the old 16f84, but has eight times the code size, much more ram, much more io pins, a uart, ad converter and a.
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