sl technological sevices

Automatic light activated lamp  find use in many domestic and industrial areas instead of bothering one’s self about when to turn OFF  or ON the light in an environment when the day is dark. The  system have its merit as to  Low Energy  Consumption ,Eradication Of Human Failure, Time Saving  And Auto-switch From ON to OFF and vice visa. Material required for its construction. Resistor Transistor DIAC Capacitors Light emitting resistor Lamp Connecting wire Soldering iron Veroboard Circuit diagram Operation When the mains input is switch on the AC voltage flows through R1 and C1 which helps to  drop the voltage before getting to the bridge rectifier .the  type of c1 capacitor is refer to as the x rated capacitor thus this type of Transformer less power supply is called Capacitor Power Supply. The rectifier convert the ac voltage to DC which is then filter by capacitor C2,the voltage flow through R2 to meet R3D5C3C4 which ...

Pure sine wave Inverter using PIC microcontroller, power inverter, solar inverter and grid tie inverter are manufacture now a days in two ways: Switch mode power supply method Common method or old method Diagrams below shows the difference between both methods.             INVERTER USING OLD/COMMON METHOD   INVERTER USING SWITCH MODE POWER SUPPLY(SMPS) In above diagrams both methods are used in inverters. But SMPS method is used in latest pure sine wave inverter. Because Switch mode power supplies are more efficient than old method. SMPS method have high efficiency, low harmonics distortion and low stand by losses. I will also discuss SMPS method in these tutorials on Pure sine wave inverter. In first diagram two square wave outputs are used to drive MOSFETS of push pull converter. If you are generating square waves with microcontroller.Then you have to use mosfet driver like IR2112 to drive push pull converte...

This Post will cover interfacing of 16X2 character LCD with PIC16F series microcontroller to display a message "HELLO NIGERIA SL WELCOME YOU". PIC16F877 is the most preferred microcontroller among hobbyist because of its wide range of features available at less cost. HD44780 is a commonly used 16X2 character LCD because it is easy to interface and compatible with various microcontrollers. so, in this tutorial we are going to interface HD44780 LCD module with PIC16F877 micrcontroller. Before Proceeding, read the datasheet of PIC16F877 to have a overview on it PIC16F877 . HD44780 - Description   HD44780 has two lines of display with 16 characters per line. Each character is displayed in the 5X7 matrix block.It has 14 pins for interfacing with external device and it has two 8 bit register namely, instruction register and data register to store and execute the instruction code and data transfer. Some LCD's have extra two pins LED+ and LED- for backlight power a...

Interfacing 4×4 keypad with LCD using 8051 microcontroller is very important step to enter big project.  So here I have discussed regarding Interfacing4x4 keypad with LCD using 8051 microcontroller. In my previous post, I was discussed on Interfacing LCD with 8051 microcontroller using Mikro c for 8051. Now we can see how easily we interface keypad and send the data to LCD for display using MikroC for 8051.   Project Detail: In this project we use AT 89c51 microcontroller and interface 4×4 keypad at port 0 and LCD at port 2. Interfacing 4x4 keypad with LCD using 8051 microcontroller From this Proteous simulation circuit diagram we can see that four resistors R1,R2,R3,R4 are connected in P0.0,P0.1,P0.2,P0.3. These resistors are work as a pull-up resistor. Because we know for input/output operation of port0 of 8051 microcontroller need pull-up resistor. For more details regarding ports in 8051 read my previous post “Ports in 9051 microcontroller”. Here you see the comp...