We love to read emails from our visitors, Please let us know by clicking here if you find any kind of bug/error in our site. We will fix it as soon as possible. PIC Controlled Relay Driver This circuit is a relay driver that is based on a PIC16F84A microcontroller. The board includes four relays so this lets us to control four distinct electrical devices. The controlled device may be a heater, a lamp, a computer or a motor. To use this board in the industrial area, the supply part is designed more attentively. To minimize the effects of the ac line noises, a 1:1 line filter transformer is used.
The components are listed below.
1 x PIC16F84A Microcontroller
1 x 220V/12V 3.6VA (or 3.2VA) PCB Type Transformer (EI 38/13.6)
1 x Line Filter (2x10mH 1:1 Transformer)
4 x 12V Relay (SPDT Type)
4 x BC141 NPN Transistor
5 x 2 Terminal PCB Terminal Block
4 x 1N4007 Diode
1 x 250V Varistor (20mm Diameter)
1 x PCB Fuse Holder
1 x 400mA Fuse
2 x 100nF/630V Unpolarized Capacitor
1 x 220uF/25V Electrolytic Capacitor
1 x 47uF/16V Electrolytic Capacitor
1 x 10uF/16V Electrolytic Capacitor
2 x 330nF/63V Unpolarized Capacitor
1 x 100nF/63V Unpolarized Capacitor
1 x 4MHz Crystal Oscillator
2 x 22pF Capacitor
1 x 18 Pin 2 Way IC Socket
4 x 820 Ohm 1/4W Resistor
1 x 1K 1/4W Resistor
1 x 4.7K 1/4W Resistor
1 x 7805 Voltage Regulator (TO220)
1 x 7812 Voltage Regulator (TO220)
1 x 1A Bridge Diode
The transformer is a 220V to 12V, 50Hz and 3.6VA PCB type transformer. The model seen in the photo is HRDiemen E3814056. Since it is encapsulated, the transformer is isolated from the external effects. A 250V 400mA glass fuse is used to protect the circuit from damage due to excessive current. A high power device which is connected to the same line may form unwanted high amplitude signals while turning on and off. To bypass this signal effects, a variable resistor (varistor) which has a 20mm diameter is paralelly connected to the input.
For more detail: PIC Controlled Relay Driver
Related projects
PIC Stepper Motor Controller using PIC16F84A with Proteus Simulation
Introduction Stepper motors are widely used in embedded systems and DIY electronics projects where precise position control is required. This PIC Stepper...
Programmers & ICSP · PIC16F84APIC Musical Doorbell using PIC16F84A with Proteus Simulation
IntroductionThis microcontroller project demonstrates a musical doorbell built around a PIC16F84A and a simple piezo sounder.Using two push buttons, the system allows...
Beginner Tutorials · PIC16C84Exploring the World of PIC Microcontrollers: An Architectural Overview
A Peripheral Interface Microcontroller (PIC), developed by General Instruments Microcontrollers in 1993, operates under software control and is programmed to execute various...
Home Automation & SecurityVoice Activated Power Sockets (Home Automation)
Yet another voice controlled home automation system! As shown in the picture, the system can control any electrical appliance, by turning ON...
Home Automation & SecurityHome Security System with GSM Using 8051 Microcontroller
Security is a big challenge everywhere because thefts are increasing day by day owing to the unsafe and insecure security systems in...
Home Automation & SecurityHome Automation and Security System using Microcontroller ATMEGA8 with Arduino Programming
Home automation and security systems have become very popular these days, today industrial automation techniques are widely adopted by luxurious homes and...
Ibrar Ayyub
I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough...