PIC Industrial and Domestic Timer (Relay Controller)

Hi Friends, I hope everyone had a rocking New year I was suppose to give you all a New year gift uploading a new project, but unfortunately it got delayed 'coz I was busy with my *personal life* One of our site member, Jeswanth kumar (jeswanthmg ) has submitted his project to me just before the new year eve. It took a little time for me to review this project. Project is titled "Industrial and Domestic Time ...

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How to use Timers in PIC18F4550 Microcontroller

Timers as the name suggests pertain to time-related operations. They are mostly used for exact delay generation. Timers are also used in various other operations like PWM signal generation, auto-triggering of several other peripherals etc. The working and configuration of PIC18F4550 Timers have been explained in this article. Timers are the most essential peripheral for a microcontroller and every controlle ...

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Relay Timer with PIC16F628

Here is 0 to 99 minutes relay timer using PIC16F628 microcontroller and 16 character LCD display. The microcontroller is PIC16F628A running at 4.0 MHz clock using an external crystal. An HD44780 based 16×2 character LCD is the main display unit of the project where you can watch and set the timer duration using tact switch inputs. There are three tact switches connected to RB0 (Start/Stop), RB1 (Unit), and ...

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Timer 0 mode timer For CSS Compiler

  // Generator frequency 100 Hz with Timer0 For Pic16f877 // //#include "D:\MICRO_PICC_Group\timer\timer_0\timer_0_100hz.h" #include <16F877.h> #device adc=8 #FUSES NOWDT,XT //No Watch Dog Timer #use delay(clock=4000000) int1 time; #int_RTCC void RTCC_isr(void) { output_toggle(pin_b0); /* time =!time; if(time==1){ output_high(pin_b0); } if(time==0){ output_low(pin_b0); }*/ set_timer0(236); } void ...

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00 to 99 minute timer using PIC16F628A microcontroller

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 actual hardware of the project isn’t with me anymore. I might have lost it when I moved from my old apartment into my new home. However, I thought this might be a good practice project for beginners and so I am sharing it here. I am not going to build i ...

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NE555 timer sparks low-cost voltage-to-frequency converter

In 1971, Signetics—later Philips—introduced the NE555 timer, and manufacturers are still producing more than 1 billion of them a year. By adding a few components to the NE555, you can build a simple voltage-to-frequency converter for less than 50 cents. The circuit contains a Miller integrator based on a TL071 along with an NE555 timer (Figure 1). The input voltage in this application ranges from 0 to –10V, ...

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Digital Count Down Timer using PIC Microcontroller

In this article, our author Mithun has developed a 0 – 99 min counter using PIC microcontroller 16F628A. So basically this is a digital count down timer ideal for engineering and diploma students for their project requirements. We have given complete circuit diagram of the digital count down timer along with full source code. In addition, photographs of the breadboard setup is uploaded. Every micro controll ...

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2-Wire Keypad Interface Using a 555 Timer using PIC16F628A

Keypads are a very commonly used input device in microcontroller-based systems. In a keypad, multiple switches are arranged in rows and columns so that they could be interfaced to a microcontroller with a minimum number of I/O pins. For example, a 12-key keypad is arranged in a 4×3 format, which allows to interface the 12 keys to a microcontroller with only 7 connections. The location of each key on the key ...

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Precision Delay Timer for PIC16F628A

Description This project is a crystal controlled precision timer providing accurate delays from 1 second to 15 hours 45 minutes.  The timer delay is set using a 10-way DIP switch.  The timer is started by pressing a switch on the main PCB or from an external switch connected via the terminal block connection.  A second switch and terminal block connection allow the timer delay to be cancelled. There are two ...

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Long Period Astable Timer using PIC12F629

Description This software functions as a long period astable mutivibrator.  The mark and space period can be set from 1 second up to a maximum 65535 seconds (18h12m15s). Using the internal 4Mhz RC oscillator delays with an accuracy of 99% or better can be achieved  The code also implements an edge triggered reset and an active low hold function.  The reset edge can be configured for rising or falling edge.  ...

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