Versatile 555 Schmitt Trigger /Logic Inverter /Level Translator

More undocumented applications for the 555 ‘oscillator:’ Not all applications oscillate as we will see. Most are knowledgeable about common CMOS logic inverters and Schmitt triggers such as the 74HC04 and 74HC14 respectively that come six in a DIP-14 package. Often, some sections are left over and can be used for future enhancements, etc. However, what do you do when only one additional inverter or increased output drive or signal level...

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Arduino & Raspberry Pi Camera Interface

Yes,we learned that we can take mobile phone camera modules from almost all mobile phones to inteface them with our advanced hobby electronics projects just as with any other standard add-on modules. Since this calls for an appropriate microcontroller, it is better to use Arduino or Raspberry Pi microcontroller as a utile platform. Raspberry Pi camera Recently I’ve received a Raspberry Pi camera board. The camera, comes with a ribbon cable...

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Mobile Phone Camera Interface Primer – 1

Today almost every mobile phone contains a camera. In principle, mobile phone camera is a sensor/camera module designed for use across a range of mobile phone handsets and accessories. It embeds high quality still camera functions and also supports rich video. For these camera modules designed to work with any host with a standardized camera interface, separate hardware accelerator device (coprocessor) can be integrated in the mobile phone...

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Delayed Automatic Power OFF

This circuit is build with the 555 IC and will automatically turn off the power after 20 minutes. You can use the circuit to turn off the porch light after you lock the house or similar other uses. The 555 timer is operated as a monostable and a momentary push on S1 switch makes the output go high which triggers the triac and makes power available in the socket. The IC output goes low again when C2 has charge up to 2/3 of the supply voltage....

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Versatile 555 Schmitt Trigger /Logic Inverter /Level Translator

More undocumented applications for the 555 ‘oscillator:’ Not all applications oscillate as we will see. Most are knowledgeable about common CMOS logic inverters and Schmitt triggers such as the 74HC04 and 74HC14 respectively that come six in a DIP-14 package. Often, some sections are left over and can be used for future enhancements, etc. However, what do you do when only one additional inverter or increased output drive or signal level...

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Remote AC Power Control by Android Application with LCD Display

The project is designed to control AC power to a load by using firing angle control of thyristor. Efficiency of such power control is very high compared to any other method. Remote operation is achieved by any smart-phone/Tablet etc., with Android OS, upon a GUI (Graphical User Interface) based touch screen operation. The project uses zero crossing point of the waveform which is detected by a comparator whose output is then fed to the microcontroller....

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Fire Fighting Robot Remotely Operated by Android Applications

The project is designed to develop a fire fighting robot using android application device for remote operation. The robotic vehicle is loaded with water tanker and a pump which is controlled over wireless communication to throw water. An 8051 series of microcontroller is used for the desired operation. At the transmitting end using android application device, commands are sent to the receiver to control the movement of the robot either to...

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Remote Operated Domestic Appliances Control by Android Application

The project is designed to operate electrical loads using an Android application device. The system operates electrical loads depending on the data transmitted from the Android application device. Operating conventional wall switches is difficult for elderly or physically handicapped people. This proposed system solves the problem by integrating house hold appliances to a control unit that can be operated by an Android smart-phone/Tablet...

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8-bit Bin to 256 /1 of 256

A long time ago when a parallel printer port was the standard, i was thinking how to get the most led's on a 8 bit interface. And came up with a simpel way to demultiplex. It can be used with dip-switches or any other 8 bit interface like a usb i/o interface. I made a 256 run light using two 74hct193 and a 74hct132. The resistor can/need to be matched by what type of led's and power you use. Parts are still available in Europe, for the usa...

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Working of 555 Timer as an Astable Multivibrator

As shown in the diagram below timer 555 works in astable mode along with the internal circuit described in the block. There are three resistors named R inside it and all have equal values. Circuit Diagram of 555 Timer in Astable Multivibrator Mode: Figure 1  555 Timer as an Astable Multivibrator – Circuit Diagram Description: Pin 2 of the 555 is the trigger input. If the voltage at pin 2 is<1/3...

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Dummy Alarm using 555 Timer

Have you ever seen or heard about Dummy Alarm? Now we are explaining you about Dummy Alarm. It is almost similar to an alarm, where as it flashes high power red LEDs for every 5 seconds. Project Description The main principle of the circuit is to flash an LED for every 5 seconds. The circuit consists of 7555 timer IC as main component. Circuit Diagram of Dummy Alarm using 555 Timer: Figure 1  Dummy...

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Police Lights Using 555 Timer

Here is an interesting project named police car lights designed using 555 timer. This circuit simulates the police car lights by alternate flashing. Project Description This circuit simulates the police car lights by alternate flashing. This circuit flashes red LEDs for three times and blue LED’s for three times. This flashing action performs continuously. This circuit uses 555 timer and a decade counter. Here, 555 timer runs...

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Timer Alarm Circuit

This circuit is a type of alarm system in which different values of resistors are used to adjust the triggering time of its buzzer. The design has fewer components than a conventional timing circuit. The circuit is supplied by a 9V DC source. The S1 is a switch that controls the supply. The S2 serves as a triggering switch in order to start the timer. The 500kΩ, 1MΩ, 1.5MΩ and 2.2MΩ resistors are the set values to acquire 5, 10, 15 and 20...

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Industrial Power Control by Integral Cycle Switching

The project is designed to achieve integral cycle switching, a method to remove whole cycle, cycles or portions of cycles of an AC signal. It is a well-known and old method of controlling AC power, especially across linear loads such as heaters used in electric furnace. However the concept of achieving the cycle stealing of voltage waveform by use of microcontroller can be very precise as per the program written in assembly / C language so...

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20 W Power Factor Corrected, Non-Isolated, TRIAC Dimmable LED Driver

This document describes a non-isolated, high power factor (PF), TRIAC dimmable LED driver designed to drive a nominal LED string voltage of 96V at 210 mA from a high line input voltage range of 195 VAC to 265 VAC (50 Hz typical). The LED driver utilizes the LYT4326E from the LYTSwitch-4 family of ICs. The topology used is a single-stage non-isolated buck boost that meets constant current regulation, and dimming requirements...

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Arduino-Digital Light Meter

Project Summary A light meter is a very useful device that finds applications in hospitals, schools, factories, parking lots, passageways, and many more to measure and maintain adequate lighting levels. It is also useful in photography to set an accurate exposure for the camera. This project describes a simple Arduino-based digital light meter, which is capable of measuring the ambient light intensity ranging from 0-65535 Lux. The...

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4 Band Resistor Calculator

Calculate the resistance of a 4 band resistor EEWeb Resistance Calculator Choose Type 4 Band 5 Band 6 Band 4 Band Resistor 1st Digit 2nd Digit Multiplier Tolerance Black 0 x1 Brown 1 1 x10 ± 1% Red 2 2 x100 ±...

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PIC Microcontroller Intro – Tutorial #3

This chapter, like its predecessor, focuses both in hardware and software related to PIC microcontrollers. In the second part, we made an attempt to blink one LED through a PIC microcontroller PIC12F675 with the help of a pre-processed (hex) code. Here, we are going to learn more about writing our own code for such a simple LED project. What is a compiler? Compiler is a program that decodes instructions written in a higher order language...

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