Vacuum Tubes Valves
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AC to DC & DC to DC
Solar Cell Circuits
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Data Bus Circuits
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RF Converter Circuits
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voltage to frequency
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Video Wall circuits
TV Video Circuits
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8051 / 8052
PCB CAD Software
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555 Timer Circuits
Remote Control Toy
H Bridge Circuit
Interconnection & Timing
Digital Signal Integrity
Digital & Bipolars
Sensors & Detectors
Regulated Power Supply
4 Band Resistor
5 Band resistor
6 Band resistor
Arduino Projects and Circuits
Arduino Projects and Circuits
AVR High Voltage Programmer Using Arduino
The project explains how to make simple AVR High Voltage Programmer using Arduino. It can be used to fix/recovery wrong fused AVR chip..
Simulating and controlling GE Color Effects Lights with Arduino
This project builds a Christmas lights controller for the GE Color Effects lights allowing programmed control of up to 8 sets of Christmas lights. Furthermore, it provides a function specific language for programming patterns for these lights and an emulation environment for testing the programs requiring the lights to be built or hung. Arduino -
Indoor Weather Station using Arduino
The Arduino 2009 acts as a standalone weather station. It does not display the data. It can operate independently for months. It samples the sensors until the RAM is full. The RAM samples are stored on a sector of an SD card. Eventually, a year`s weather samples could be stored on the SD card. Each time the PC is connected, any unstored sectors ar
Arduino Eye Shield
The Arduino Eye Shield is a circuit board that can be plugged on top of the Arduino allowing it to interpret analogue video ( PAL or NTSC ) from a camera or other source. It gives the Arduino the power of sight. There are many applications for this. In the example below the video information from the camera is used to drive an 8x8 LED matrix (with
Arduino Analog Read Potentiometer to Digital Out LED
The analog to digital sketches have been covered a million ways from Sunday with every conceivable part but in order for us to move on to more complex circuits and concepts I need to be sure you know these simpler ones. This tutorial wont be quite as in depth as the others because frankly there just isn`t much code. Without further delay I give yo
When starting with Arduino, one soon has much more Arduino boards then RS232 or even USB ports on the computer. So that, it seems more useful to put the signal level converter to an external adapter than directly on the Arduino board. Usually, one has (I have) a big basket full of ATMEGA8 and ATMEGA168 with Arduino bootloaders and one idea. So I n
New AD9850 DDS Signal Generator ModuleCircuit for Arduino MCU 2560
Arduino Based Current Sensor Circuit
The main component used is the ACS712 sensor from Allegro MicroSystems to measure the current. It provides economical and precise solutions for AC or DC current sensing in industrial, commercial and communications systems. Located near the surface of the die of the device is a precise, low-offset, linear Hall sensor with a copper conduction path.
Simple Soil Moisture Sensor - Arduino Project
This is a simple arduino project for a soil moisture sensor that will light up a LED at a certain moisture level. It uses Arduino Duemilanove microcontroll..
Arduino Panic Alarm Project
Here is the circuit of an Arduino-based Panic Alarm! The wiring is very simple so that even a novice can construct this interesting circuit without any difficulty. Arduino is a family of microcontrollers (tiny computers) and a software creation environment (Arduino IDE) that makes it easy for you to create programs (called sketches) that can inter
Auto-Fill Valve with Arduino
Part Fill valves are widely used in Rainwater tanks. The valve will open once the water level in the tank has fallen to a low posit..
Light Sensor Arduino Compatible
An Efficient Low-Power Arduino Switching Voltage Regulator
The voltage regulator built onto the Arduino Uno is a linear-type regulator and is horribly inefficient. If you are running the ATmega238 at 5V using a 9 V battery, approximately half of the battery`s energy will be dissipated as heat by the regulator. This post demonstrates a DC/DC switching-type voltage regulator circuit that can be use with a b
Schematic of a Breadboard Arduino
This schematic is for an extremely bare-bones circuit and includes only the needed components to operate a ATmega328 running the Arduino Uno bootloader. I leave it to you to design your voltage regulation circuit (see this post ). The connections to AREF and AVCC are only needed if you intend to use the chip`s ADC, but I included these...
Multiple switches on Arduino analog pin schematic
Connect a 5 way button/joystick to an Arduino using a single analog pin and wanted to quickly simulate it to verify my calculations before I went and soldered everything. The voltages for the six states are 0, 1, 2, 3, 4, 5. The 4V being shown in the photo is because one of the switches is pressed. I solved the problem of the all switches open...
Schematic of 4x4x4 LED Cube for Arduino
arduino cylon eye schematic
Arduino controlling a DC Motor
When controlling motors with a microcontroller (like shown), the snubber is really pretty important. I haven`t seen this configuration, though, and typically the snubber is placed across the motor itself. The general idea is that there is charge that builds up on the motor coil, and, when the transistor is "off", the diode allows a current to...
Arduino controlling a DC Motor
arduino Glacial Communications
I built my own Lo-fi Arduino Guitar Pedal. I`m even using a similar enclosure work tossed out a couple of thinwire->twisted pair converters that I snapped up. I think the only major deviation is that mine only has one output at present- I could add a second later, though. I got to thinking last week that a digital delay wo
MPF102 FET Preamplifier Arduino
A Darlington would perform even better, but the circuit would be slightly more complicated. (See the schematic at bottom-right. ) Fortunately, the added complexity is inside the part! The reason for the Darlington`s superiority is that it can provide the lowest output impedance. I don`t know how low you need the output impedance to be. For the Darl
ScratchBoard Emulator using Arduino Uno
A circuit and arduino code to approximately emulate a ScratchBoard ; there is sound, light, a button and four sliders but it isn`t a drop-in replacement. remember to change the COM ports in the Arduino IDE and in Scratch so that they are not competing (if the Arduino is on COM3 then only one of the IDE or Scratch can use COM3 at a given ti
Arduino ATmega328 Hardcore
The kit includes the following items (depending on which bootloader chip 16MHz or 8MHz) The kit includes the essential items to create your own Arduino 328 board. Here is a breadboard with all the components mounted and running the demo led flash program You can program the processor directly from the Arduino IDE. All you need is a TTL serial...
Arduino UNO Tutorial Rotary Encoder
With a rotary encoder we have two square wave outputs (A and B) which are 90 degrees out of phase with each other. The number of pulses or steps generated per complete turn varies. The Sparkfun Rotary Encoder has 12 steps but others may have more or less. The diagram below shows how the phases A and B relate to each other when the encoder is turned
Arduino UNO Tutorial NightLight
A Light Dependent Resistor (LDR) to create a simple childrens bedroom nightlight which turns on automatically when it gets dark and turns off when it gets light. An LDR`s resistance changes depending upon the amount of light hitting the sensor. For the LDR we are going to use the resistance reduces as the light falling on the device increases....
credit card sized Ethernet Arduino compatable controller board
I love the Arduino as a simple and accessible controller platform for many varied projects. A few months ago, a purchased an Ethernet shield for my A..
ATtiny programmer using Arduino ISP
For relatively small (less number of pins than ATmega328) projects, ATtiny series, ATtiny45 or Attiny85 are good choice in terms of its physical size..
Arduino Audio Output
Generate sound or output analog voltages with an Arduino. This Instructable will show you how to set up a really basic digital to analog converter so..
Arduino Audio Triggered Power Switch
Ever wanted your home entertainment or sound system to power up itself when plugging in your iPod or other portable MP3 player? Watch this video to s..
Arduino Guitar Pedal
Start to build the circuit as pictured in the schematic. To see the schematic larger, click the little i in the upper right-hand corner of the image..
Arduino Vocal Effects Box
This Arduino-powered vocal effects box pitch shifts and distorts incoming audio signals to produce a wide variety of vocal effects. This project is my first experiment with real-time digital signal processing using Arduino. It samples an incoming microphone signal at a rate of about 40kHz, manipulates the audio digitally, and then outputs 8 bit a
PIC Microcontroller Circuits
AVR Microcontroller Circuits
Microcontroller Programmer Circuits
68HC11 Microcontroller Circuits
8051 / 8052 Microcontroller Circuits
Ultrasonic distance finder circuit
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is measured. There are three main categories of distance measurement methods in use: a) By...
Simple Metal detector circuit with CD4030
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to find something potentially valuable, hidden a few centimeters below the soil. So many...
Fully automatic watering circuit for flower pots
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This circuit comes as a solution to this problem. Depending on humidity of the pot at...
Simple deep searching metal detector circuit
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the circuit of this metal detector, it is possible to detect a metal coin in depth of 90 to...
Sub-Harmonic Bass Converter for Electric Guitars
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound, such as filtering or distortion. Instead, a frequency division system produces outputs...
Echo Depth Sounding Sonar for Boats
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the calibration of the rope. This arrangement still exists in some yachts. The big...
100W HiFi Audio Amplifier Circuit
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power supply must be symmetrical so that no electrolytic capacitors are needed at the outlet....
Plant-Pot Water Level Indicator Circuit
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower. The circuit of the device is shown in Figure 2. The water detection is made from the bottom...
Analogue Sound Preasure dB-Meter Circuit
The best human ear can capture sounds from 20Hz to 20KHz. These limits are known to be the broadest that can exist. Normally the normal limits range from 100Hz to about 13KHz and depend on the age and health of the individual. We for our measurements and to have a good accuracy we will get the limits of 20Hz to 20KHz. A sound to be heard does...
Digital Signal Integrity
Interconnection and Timing of Digital Circuits
CMOS Circuits Tutorial