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Microprocessor Circuits
Microprocessors:  #'s - B      C - F      G - K      L - M      N - P      Q - S      T - Z

Last Updated: December 29, 2017 03:15 AM

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Digital/Analog USB Data Logger - Based on a PIC micro, this simple project can log lots of data to a memory card.  It can read from many types of digital and analog sensors and features a real-time clock and calendar to "time-stamp" the data.  It has a USB port and comes with a PC host program, allowing you to configure the sensors, change settings and charge the battery.__ SiliconChip

Digital/Analog USB Data Logger, Pt.2 - Last month, we described the main features of the USB Data Logger and gave the circuit details.  This month, we give the assembly procedure, explain how to install the Windows driver and PC host software and describe how the unit is used.__ SiliconChip

Digital/Analog USB Data Logger, Pt.3 - In this third and final article on the USB Data Logger, we describe how to use the accompanying Windows host software.  This software allows you to edit and test scripts, upload them to the logger and change its settings.__ SiliconChip

Digithermo 0-100.0 °C - Build your own a laboratory instrument for measuring time and temperature.  The DigiThermo demonstrates the use of 'C' language, a dual-slope converter, LCD interfacing, and digital filtering as well.   __ Designed by Wichit Sirichote

Dirt cheap video using PIC16F819 - PIC Project  Want to add video to your next project?This device uses a PIC16F819 and not much else.  Getting 20 characters to a line is possible by using the SPI port to generate video.  Neat trick, eh? __ Designed by Luhan Monat - Mesa Arizona

Displays Multiple Chart or Oscilloscope Timing Ticks - 05/01/08  EDN-Design Ideas - A crystal controlled microcontroller generates precise timing ticks __ Circuit Design by William Grill, Honeywell, Lenexa, KS

DIY 2^16 encoder based on PIC - This code is WORK IN PROGRESS, use at your own risk.  This encoder can transmit the state of up to 16 TTL digital inputs using an RF or infrared transmitter.  When enabled, the included modulator automatically generates  the 38kHz IR carrier.  Containing a PIC microcontroller, the circuit is very flexible.  You can decide which transmitter inputs will trigger a transmission.  You can control the receiver outputs to be latched or momentary with the LATCH input.   __ Designed by Peter Jakab

DIY Fast LUX Meter - Lux meters that are capable of measuring high-speed light intensity fluctuations are hard to find.  This article describes a DIY lux meter that has a linear relation between the light intensity and output voltage and has a -3 dB frequency range from DC to 350 kHz.  The spectral sensitivity is broadly similar to the human eye. __ Designed by Freddy Alferink

DIY Nokia 51xx/61xx data cable - This is a simple project for one winter night when you have nothing better to do.  Parts will not cost all that much, so you will save money by building the cable yourself.  This also works with everything I tried on my 6150 phone. __ Designed by © Madis Kaal

DIY PIC Programmer - Program PICs through your parallel port.

DIY remote control based on PIC - Control up to 8 devices by this easy constructable remote control.  It can work as a radio or infrared remote control, depending on the components.  Each device output can be configured to be momentary  (turned on while you press the button) or latched.  Latched outputs can be toggled on/off by one button per channel, or turned on and off by two buttons per channel __ Designed by Peter Jakab

DIY Terminal Strips - PIC Project   __ Designed by Luhan Monat - Mesa Arizona

DIY wattmeter with an Arduino - It is difficult or sometimes even impossible to measure power and energy with ordinary multimeters.  To carry out such a measurement reliable and accurate, a special wattmeter is required.  Because these meters are very expensive, a cheaper solution is presented here as a DIY wattmeter based on a Arduino Nano board. __ Designed by Freddy Alferink

Diy: Arduino Chatting - Networking is the one of the most important mean of communication used to communicate with people who are connected to one.  Most of the available network communication modules in the market...__ Electronics Projects for You

Do-It-yourself splitters - Application Note__ MiniCircuits.com

Door Camera Mount - PIC Project  If your front door has one of the peep hole viewers, you can use this method to mount a small video camera in its place.  A small project box outside contains the video camera  ($25 from Circuit Specialists) .  The camera is hard to see in this picture; it is in the top half of the box.  A hole just below the center is fitted with a short piece of lamp threaded rod  (from your local hardware store) , a big washer, and the matching nut.  The metal cover for the box is replaced by some 0.060 lexan and held with 4 screws.   __ Designed by Luhan Monat - Mesa Arizona

Dot matrix LED running display. Part 1. Schematic Description - Brightness settings The user can select the brightness level in 8 steps or select an auto mode.  To change the brightness from Settings menu, select Bright and press SET.  The display will show the current bright level  (from Bright 2 __ Designed by Ivailo Vasilev

Dr Video Mk.2: an Even Better Video Stabiliser - Clean up those copy projection "nasties" and get a rock-solid picture from your DVD player or VCR.__ SiliconChip

Dr Video-An Easy to Build Video Stabiliser - Clean up those copy protection nasties and get a rock solid picture on your TV from tape or DVD.__ SiliconChip

Driving an LED with or Without a Resistor - In this post I will try to show, why it's a good idea to use a current limiting resistor for an LED.  And when it's save to drive the LED without any resistor.  If you read about LEDs, you will notice that everyone tells you, that you need a current __ Designed by Radio LocMan

Driving Dot LED - A basic circuit of the 89C2051 shown here can be made easily using point-to-point soldering with a universal PCB.  Use an ordinary 20-pin socket, do not use a circle-pin socket.  D1 is a small dot LED.  U2 can be either 7805 or 78L05.  U3 is optional for correcting any polarity DC adapter.  Without the 2051 chip __ Designed by Wichit Sirichote

Driving high-power loads with a microprocessor - This tutorial offers suggestions about controlling large loads with a microprocessor.  This is often an issue with those building robots who need to control devices such as lights, motors, vacuums, and other accessories found on robots.  We will only deal here with devices that need to be switched ON and OFF - not devices that need the power reversed.  Obviously drive motors and other devices need to be switched ON/OFF and also have the power reversed in order to reverse the direction of the motors.  That normally requires an H-bridge which is a much more complicated circuit. __ Designed by Roger Arrick

Driving LED display matrix from a PIC micro - Driving a 64 LED dot matrix LED display is quite simple and just requires ONE TRICK!    Here you can find out how to drive an led dot matrix with 64 LEDs  (8 rows by 8 columns - 8x8 display) or less e.g.35 LEDs  (7 rows by 5 columns - 5x7 dot matrix) .  However the principle remains the same for larger displays - you may need more processing power and driver circuitry though. __ Designed by John Main

Driving LEDs In Parallel & Series using a PIC16c510 - Scroll to find this circuit #6 - If a number of LEDs are required to be driven from a single output, you will need to connect them in parallel or series.  There are limitations, however, as you will see.  Firstly it is ok to connect two LEDs in series, provided you work out the value of the dropper resistor.   __ Contact: Colin Mitchell

Driving Light & Accessory Protector for Cars - External devices on cars are an easy target for thieves.  Or at least they were: this will keep the crooks away from your car.__ SiliconChip

Driving More Than 4 LEDs using a PIC16c510 - Scroll to find this Circuit #7 -If more than 4 LEDs are required to be driven, a buffer transistor will be required as shown in fig: 12.  This transistor will allow the LEDs to be driven from a 12v supply  (or higher) and the number of LEDs can be increased to 6 per column for 12v __ Contact: Colin Mitchell

Driving VFDs with a PIC - Vacuum fluorescent displays, known as VFDs  (because both vaccuum and fluoroscent are hard to spell) are commonly used in VCRs and microwaves.  They are relatively bright and have a low power consumption.  Some older calculators used them before LCDs became popular.  Having obtained a few Futaba VFDs from a surplus dealer, I went about trying to interface it to a PIC.  A plea went out on the PIC list and was soon answered by Kalle Pihlajasaari with a few details on VFDs.  

DS1620 programming tool - I needed thermostat control for my countryhouse that would be precise at low temperatures, so that I can keep the temperature above freezing while I am not there.  The winter here is long and cold, so heating more than absolutely necessary makes your wallet a lot thinner.  DS1620 chip, originally from Dallas, now Maxim was easy enough to find.  It has an ability to run in stand-alone thermostat mode where it only needs power, and will drive output according to set temperature limits.  However, what I could not find was PC software for programming the limits.  There is a programming tool from Dallas, but that only works for ancient windows versions and DOS. __ Designed by © Madis Kaal

DS1820 Arbiter V2.00 Schematic - Schematic + Parts List __ Designed by NG Hubbard

DSC PK5500 keypad fix - After just 3 years since installation LCD panels of both keypads of my home security system failed pretty much completely.  It started with one of them developing a lot of 'bad pixels' until the text became unreadable.  The other followed the suit few months later.  The process from first bad pixels to unusable level took about a year or so. __ Designed by © Madis Kaal

DSO-triggering scheme is cheap & efficient - 05/07/98 EDN-Design Ideas - NOTE : Page includes several designs, scroll to find this one.   Although a logic analyzer is useful in troubleshooting a new design, nothing beats a digital storage oscilloscope (DSO) for the ability to see bus levels and timing.  However, the trigger mechanisms on most DSOs are not  sophisticated enough to trigger on a specificm P bus state __ Circuit Design by Robert Perrin, Z-World, Davis, CA

DTMF driven rebooter - I have a linux box that is hosted at ISP.  Couple of times I've managed to lock myself out of it by messing with network settings, and after the latest successful shot at my foot I decided to do something about it.  After some websurfing for ideas, this is what came out:

 __ Designed by © Madis Kaal

Dual DC Motor speed control with reverse - I built this way back in 2000 to power a remote control "tank" I built in high school.  Circuit schematic, source code, and pictures of the project are all shown.   __ Contact: Paul Wilkins

Dual Digital Thermometer - This application shows how to use the PIC16F877 to control, and interface with the Dallas DS1820 1-Wire™ Digital Thermometer.  If you missed the LCD connection schematic for these experiments,  __ Designed by © Reynolds Electronics

Dual Light PIC Switch - This is a lamp timer capable of operating two separate relay switches.  Outputs can be in three  (or restricted to two) states: OFF, delayed ON and constant ON.  Delayed ON mode is indicated by the LEDs.  The source code is easily customizable for your needs: set your desired delay time or disable constant ON state.  

Dual Light Timer based on PIC - Uses PIC12F629 __ Designed by Peter Jakab

Dual PIC16C84 Prototype Board Microchips production programming algorithm consists of programming at the normal VDD then verifying at VDD-Hi and VDD-Lo.   __ Designed by crun @ users.sourceforge.net

Dual Stepper Motor Driver for a Robot Differential Drive - This article describes the hardware and the software used to control two stepper motors suitable for a robot differential drive.  The circuit accepts two 2-bit words that command each of the motors to go forward, backward, hold a position, or to idle.  It also provides an output signal when a step is being taken.  It is a flexible design allowing for unipolar and bipolar motors __ Designed by J. L.  John Girard

Dual-Tracking ±19V Power Supply, Pt.1 - This linear bench supply can deliver up to 1.6A from positive and negative outputs with a range of ?0-19V.  It has adjustable current limiting for both outputs and can display the voltage or current reading for either rail.  If powered from an AC plugpack, no mains wiring is required, although less current is available.  It also has a 5V 750mA output for powering digital logic ICs and microcontrollers.__ SiliconChip

Dual-Tracking ±19V Power Supply, Pt.2 - Last month, we introduced our new Dual Tracking ?19V Power Supply and explained how it works.  This month, we show you how to build the PC boards, install them in a case, wire it up and get it going.  Both the mains-powered and plugpack-powered versions are covered.__ SiliconChip

Dynamic VID Power Supply for Pentium® III Processors - Design Solutions 7 Design Notes__ Linear Technology/Analog Devices

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Microprocessors:  #'s - B      C - F      G - K      L - M      N - P      Q - S      T - Z 

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