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Efficient LED Blinking for Embedded Systems - Smart hardware design can simplify the embedded software and make it more reliable. Designers use blinking LED signals to indicate different status and for inbuilt testability. Making an LED array blink...__ Electronics Projects for You
Eight LEDs Random Flasher - This project uses a 4026 counter and display driver IC to flash eight LEDs in an apparently random manner. It can be used to create a display of your choice. __ Designed by John Hewes
Eight-Function Remote Uses One Button, No Microcode - 12/15/09 EDN-Design Ideas Simplify the operation of a remote control Design by Jay Davis, Boeing Integrated Defense Systems, Wichita, KS
EL wire eye candy The 8-channel sequencer will switch the wires according to programmed patterns. It uses a Basic Stamp II microprocessor. The Mikey Sklar's el pants & bag and Greg Sohlberg's Rhino-8 sequencer. I used the Basic Stamp II for the processor, and went with Greg's suggestion & used a 9-pin connector, with 8 HV outputs and one "common", instead of individual 2-pin connectors for each of the 8 EL wire channels. __ Designed by guerroloco
Electric Curtains Control - This hybrid circuit uses a mixture of transistors, an IC and a relay and is used to automatically open or close a pair of curtains. Using switch S3 also allows manual control, allowing for curtains to be left only partially open or closed. The circuit controls a motor which is attached to a simple pulley mechanism, to move the curtains. I first started this circuit over 20 __ Designed by Andy Collison
Electric heater thermostat - One Advantage of these two units is the Sensor can be placed Away from the heater, therefore sensing the Actual Room temperature, not the direct heat from the heater. These can also be used in a confined space with a Heat Lamp, to create a Drying Oven __ Designed by G.L. Chemelec
Electric Motor - Back in the old days, before home computers, there were certain things that technically minded boys just had to have done, and one of those was to build a working electric motor from scratch. I built this one when I unexpectedly had time off school because of a fire in the auto shop there __ Designed by Markus Wandel
Electric Power Controller - suitable as dimmer for 100-Volt lamp up to1200W __ Designed by Seiichi Inoue
Electronic candle - This circuit will detect light falling on the Light Dependent Resistor (LDR or CdS). When light falls on the LDR the arrangement of resistors at the base of the transistor T1 gives a change of voltage. This biases or turns on the transistor which turns on T2, allowing sufficient current to flow to light the globe. The arrangement of the resistors at the base of T1 is called a Potential Divider. It is adjusted to suit ambient light conditions by the variable resistor VR1. A typical use would be to set the project up in the refrigerator. The light will light up in another room if you have enough wire, or you could put a buzzer in instead of the light and catch whoever is raiding the refrigerator.__ CdS Electronic
Electronic Candles - Here is a simple circuit that can produce the effect of candle light in a normal electric bulb. A candle light, as we all know, resembles a randomly flickering light. So,...__ Electronics Projects for You
Electronic Christmas Tree - Schematic + Info + pictures __ Designed by Lennie Zink
Electronic Church Bell Controller - This circuit is a church bell controller. Basic component is an ATmega32 microcontroller. At the circuit 2 24LC32 eeprom memories is being used, the 1st for internal standard melodies and the 2nd one is for user's compositions. This feature will be provided in the future __ Designed by Antonis Pontikakis © 03.10.2007
Electronic Compass Controller - Several Projects, scroll down. Eventually we all want to know just where our robot is, so we can choose an absolute direction. Usually this type of device is quite expensive. However to our rescue comes Dinsmore with low-cost electronic compass module. It outputs the four cardinal points and combinations thereof that will give eight directions. I decided that combining this with tilt sensors (the Dinsmore compass will only work if not tilted more than 12 degrees) would be a cool project. I am using a PIC 12C508 to do the dirty work and return an 8 bit number with the directional and tilt data all included____ Designed by Dennis Clark
Electronic Control for DC Motors using Discrete Bridges - Gallery of motor-control circuits and motor-control basics __ Designed by Scott Edwards
Electronic Door Release - The IC is a quad 2 input "AND" gate, a CMOS
4081. These gates only produce a HIGH output, when BOTH the inputs are HIGH. When the key wired to 'E' is pressed, current through R1 and D1 switchs Q5 on. The relay energises; and Q5 is 'latched on' by R8. Thus, the Alarm is set by pressing a single key, say one of the two non-numeric symbols __ Designed by Ron J.
Electronic Fluorescent Lamp Ballast - International Rectifier App Note in PDF format
Electronic irrigation controller based on PIC - This is a simple one-valve irrigation controller made for our greenhouse. The code contains a software real-time clock (RTC) and a multiplexed 8-digit LED display and keyboard you can use in other projects. Turn on the sprinkler or the aquarium lighting for the same period of the day. You can choose to operate the output by every 2nd, 3rd day only. There is a manual start/stop button to immediately turn on or off the output, and a disable button to completely turn off automatic operation __ Designed by Peter Jakab
Electronic KeypA - D - The IC is a quad 2 input "AND" gate, a CMOS
4081. These gates only produce a HIGH output, when BOTH the inputs are HIGH. When the key wired to 'E' is pressed, current through R1 and D1 switchs Q5 on. The relay energises; and Q5 is 'latched on' by R8. Thus, the Alarm is set by pressing a single key, say one of the two non-numeric symbols __ Designed by Andy Collison
Electronic Load Controller for microhydro systE - M - A key component of small water turbine installations. __ Designed by Manfred Mornhinweg
Electronic Motor Starter - This motor starter protects single phase motors against voltage fluctuations and overloading. Its salient feature is a soft on/off electronic switch for easy operation. The transformer steps down the AC voltage from...__ Electronics Projects for You
Electronic SPDT controls two PCs - 09/02/99 EDN-Design Ideas The circuit in Figure 1 is a switch that allows you to use one VGA monitor, one mouse, and one keyboard with two PCs. The switch has four pushbuttons. One switches the monitor between the two PCs, a second switches the mouse, a third switches the keyboard, and a fourth connects all the devices to the PC that's inactive at the moment. Design by Luis Angulo, Barakaldo, SpainSeptember 2, 1999
Electronic Speed Controller for R/C Models - Here's how you can make an electronic speed controler (ESC) for your remote control car, boat or even an airplane using an old servo and some MOSFETS
Electronic Thermostat for Fridge - A thermostat is a standard equipment for sensing temperature of a system and maintaining it at a pre-defined point. It is a regular feature in air-conditioners, room heaters and refrigerators. Although...__ Electronics Projects for You
Electronic Thermostat Relay - Here is a simple thermostat circuit that can be used to control a relay and supply power to a small space heater through the relay contacts. The relay contacts should be rated above the current requirements for the heater. Temperature changes are detected by a (1.7KAT70F) thermistor placed in series with a 5K potentiometer which produces about __ Designed by Bill Bowden
Electronically Generate Rotating Magnetic Fields - 18-Feb-10 EDN-Design Ideas Generate magnetic fields with a microcontroller instead of mechanical parts Design by F Ferrero, J Blanco, JC Campo, and M Valledor, University of Oviedo, Gijón, Spain
Eliminate thermoelectric EMF in low-ohm measurements - 06/13/02 EDN-Design Ideas When two different-metal conductors connect together in a loop and one of the junctions is at a higher temperature than the other, an electrical current flows through the loop. The magnitude of this current depends on the type of metals involved and the temperature differential of the junctions. When you open such a loop, a thermoelectric voltage appears across the open ends Design by John Wynne, Analog Devices, Limerick, Ireland
Eliminating Front-End Overload with RF AGC - A Kenwood L-07TII I once owned had very high sensitivity on the bench. But with an outdoor antenna connected, it showed a fatal flaw: background noise on strong signals, and no hint of weak signals that other tuners received clearly. These symptoms suggested front-end overload. __ Designed by Brian Beezley K6STI
Emergency 12V Lighting Controller - This easy-to-build project automatically turns on the power for 12V emergency lights within a second or two of a mains power failure. Build it and you won't have to search for candles or your torch in the event of a blackout.__ SiliconChip
Emergency Backup Lamp - This back-up lamp stays off as long as light falls on the CdS photocell from either the NE-2 or from room ambient light. So, if the power fails at night, the lamp will light. The 6 volt lamp should be directed away from the photocell __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Emergency Lamp & Turning Indicator - White LEDs are replacing the conventional incandescent and fluorescent bulbs due to their high power efficiency and low operating voltage. These can be utilised optimally for emergency lamp and vehicle turning...__ Electronics Projects for You
Emergency light flasher schematic - If you elect to use an antenna tuner, it is extremely important that you understand exactly how to use tuners and what they can and cannot do. A few watts of RF can easily become lost in an incorrectly adjusted antenna matching device. The whole idea of a QRP station is to keep things simple and economical, so I cannot overemphasize the priority of a clean, efficient connection of the amplifier output to a resonant antenna. __ Designed by Guy Roels ON6MU
Emergency Light with Charger - White LEDs are replacing the conventional incandescent and fluorescent bulbs due to their high power efficiency and low operating voltage. These can be utilised optimally for emergency lamp and vehicle turning...__ Electronics Projects for You
Emergency strobe flasher generates 250V - 08/05/99 EDN-Design Ideas Figure 1 shows a complete circuit for an emergency lamp that operates from a 12V automotive battery. The xenon flash tube requires a 250V-dc anode voltage and a 4-kV trigger pulse. To generate the 250V dc, IC1, Design by Jose Luis Arce, Tecnosuma Havana, Cuba
Emergency Vehical Flasher - There are several projects on this page. Please scroll down to find the LED Chaser. __ Designed by Jason KE4NYV from Roanoke, Virginia
Encoder & PC make complete Motor-control systE - M - 12-Dec-02 EDN-Design Ideas This design idea combines a simple ISA-bus-resident interface circuit; a garden-variety PC; a high-resolution optical shaft encoder; and a PWM-controlled, 0.05-hp, brushed, permanent-magnet dc motor to make a high-precision and high-power motion-control system. The system sequences the precise rotation of an evacuated steel bell jar several feet in diameter, such as those used in molecular-beam Design by Steve Woodward, University of North Carolina, Chapel Hill, NC
End of Train Flasher - Schematic + Info + pictures __ Designed by Lennie Zink
Engine Control Unit Schematics - The original plans for the ECU called for a very simple unit designed to keep the engine within parameters. I was going to use a Basic Stamp 2, a pressure transducer, and a thermocouple. As work progressed, I realized that greater functionality could be obtained with a proper tachometer, and the use of a faster, more capable, compiled Microchip controller. I will leave these circuits posted, but the final ECU will make much greater use of the inherent capabilities of the PIC16F876, 28-pin microcontroller, especially for tasks like driving the pump and the glow plug.
Ensure Safety In Power-On Operation - 04/24/03 EDN-Design Ideas Buck converter handles battery-backup systemComputers find universal use in industrial-control systems. During power- and start-up sequences (booting], the outputs of such control systems may yield uncontrolled pulses before the Design by Jean-Bernard Guiot, DCS AG, Allschwil, Switzerland
Ethernet Controller - This circuit is an ETHERNET controller I use the PIC18F452 and the mikroC C Compiler. I use also the JAVA SCRIPT information you can get from www.w3school.com I Control 8 outputs throw the WEB and transfer time information also. __ Designed by Antonis Pontikakis
Ethernet Interface for Automation Systems - Communication with remotely located automation systems is possible via the Internet. A physical communication port with a network is required for this communication. An Ethernet interface can be used for that...__ Electronics Projects for You
Expandable 16 Stage LED Sequencer - The circuit below uses a hex Schmitt Trigger inverter (74HC14) and two 8 bit Serial-In/Parallel-Out shift registers (74HCT164 or 74HC164) to sequence 16 LEDs. The circuit can be expanded to greater lengths by cascading additional shift registers and connecting the 8th output (pin 13) to the data input (pin 1) of the succeeding stage. A Schmitt trigger oscillator (74HC14 pin 1 and 2) produces the clock signal for the shift registers, the rate being approximately 1/RC. Two additional Schmitt Trigger stages are used to reset and load the registers when power is turned on. Timing is not critical, __ Designed by Bill Bowden
Expandable Graphic Equaliser - Constant Q design. Can be made using as many or as few sections as needed __ Designed by Rod Elliott ESP
Experimental Cross Fader - ideas to modify simple rotary light dimmers to make a cross-fader
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