Vacuum Tubes Valves
Musical & effects
Yagi Uda Antennas
Metal Detector Circuits
Liquid Sensing Circuits
Light Sensing Circuits
Voltage Detector Circuits
Air-Gas Detection Circuits
Human Sensing Circuits
RF & Radiation
Optical Sensing Circuits
Free Energy Circuits
AC to DC & DC to DC
Solar Cell Circuits
Micro Power Circuits
Switching Power Supplies
Light Laser LED
Digital to Analog
Analog to Digital
Data Bus Circuits
Voltage to Pulse
Current to Voltage
Frequency to Voltage
RF Converter Circuits
Sine to Square Wave
Voltage to Current
voltage to frequency
Period to Voltage
Video Wall circuits
TV Video Circuits
Motor Control Circuits
8051 / 8052
PCB CAD Software
Car bike Circuits
555 Timer Circuits
Remote Control Toy
H Bridge Circuit
DIY HV Variable Cap
DIY PMA alternator
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
Arduino and ATMega8
I have since constructed a programming "jig" to avoid keeping the circuit on the breadboard. More detail, and photographs can be found on the Learning About the AVR Parallel Programmer page.
Arduino LED blinking with variable speed
Now, to perform LED blinking in varying speed, we are sure, that we need to somehow change the delay time of an LED to remain in ON and OFF stat. So the main funda is to change the argument to function delay with change in time that`s it. Here, first we initialize the variable j=1. Then, we are going in the loop. And in loop we will check the c
STHS Computer Technology
On the breadboard, build two bi-directional motor control circuits (also known as "H-bridge") circuits. These circuits will control the two DC motors that drive the wheels. Each circuit will have two wires from the Arduino (one for forward, one for backward) to control the circuit, and two wires from the single DC motor that it is controlling. You
AM sofware radio using Arduino
Markus built a software AM radio transmitter using the Arduino. The audio signal is fed to the ADC input through a decoupling capacitor. A PWM output pin directly drives a capacitor inductor circuit with an antenna. The schematic and firmware are available.
Arduino Controlled Pneumatic Servo
For an upcoming project I needed a pneumatic ram with a closed loop control system so I could position it accurately. Didn`t have the budget for an off the shelf solution, so I bodged one together with an ardunio, a couple air solenoid valves, and a pair of potentiometers. How it works is one potentiometer is the target while the other is mounted
The Cylonduino Arduino Experiement
I`ve been putting in a lot of extra hours at work the last week in anticipation of an editing deadline. Despite this, I thought it was about time that I attempt a little hardware hacking. Even before computers, I was facinated by electronics. I read book after book, but had little success in applying any of that knowledge beyond kits bought from R
measuring battery capacity with an arduino
I needed a couple of AA batteries and found the display at the supermarket where they were all arrayed. Normally when I`m shopping in the supermarket, I tend to look at the price/kg or price/l when comparing similar products. In the case of the batteries, there was no such indicator. Fine, I thought, I`ll work it out myself. I grabbed a few differ
Worlds first Arduino flashlight ships soon
Following a highly successful Kickstarter project and over a year of development, HexBright, billed by its creator as the world`s first open source Arduino flashlight, is now in production with initial shipments planned for December. HexBright, which we discussed here in detail last year, is the brainchild of three-time Battlebots champion Chri
Expressive Arduino Midi Sequencer
This section of code outlines the main sequence of operation for the sequencer. First, a for loop is utilized to govern which step the sequencer is operating in. Within this loop, first an address is made using the assignByteToPins() function, this sends a 4 bit binary address to ensure that the input of each analog multiplexer corresponds to the
Load Cell with an Arduino
We built a system that uses eight air-clamping cylinders (McMaster-Carr 62185K64) to push down on a piece of glass to seal it to a sidewall. A number of times, the glass has cracked. So, this project is an attempt to come up with an inexpensive way of measuring how many pounds of force the cylinders are exerting. The sensor that we want to use is
Brushless DC (BLDC) motor with Arduino
Arduino sketch and other useful information about driving a brushless DC motor, such as DVD drive spindle motor, using Arduino or another MCU
Brushless DC motor with Arduino
Building a stroboscope (zoetrope) from Arduino and the spindle motor of a broken Xbox 360 DVD drive. Zoetrope animations, Arduino sketch and circuit diagram included
Driving a Bipolar Stepper Motor with Arduino and ULN2803AG
While I`m getting ready to rip open some 10+ broken DVD-RW drives coming to me from an eBay seller, I though it would be great to have a testbed for the bipolar stepper motors I will harvest from those. I have a bunch of ULN2803AG Eight Darlington Transistor Arrays with Common Emitters left from past projects and these can sink (but unfortunately
Manually controlling bipolar stepper motor with Arduino and EasyDriver
A simple circuit that can be used for testing of bipolar stepper motors or for manual positioning using steppers. Schematics, Arduino sketch and video here
Pimp Your Chocolates with Arduino IDE and ATTiny13
Convert a nice but ordinary chocolate box into a raging LED Blinking Inferno with ATTiny13 AVR chip, Arduino IDE and a handful of electronic components
Valentines Day POV display using ATtiny13 and Arduino IDE
Smart Valentine`s Day gift - a movement-sensing box of chocolates with an LED message! Circuit diagram and How to build the project on ATtiny13 and Arduino.
Worlds Smallest Stepper Motor with Arduino and EasyDriver
A video and the circuit with schematics for connecting and controlling the world`s smallest linear actuator based on a bipolar stepper motor from a Bluray drive.
FT232RL USB to Serial Adapter for PIC AVR ATMEGA ARDUINO MCUs
FT232RL USB to Serial UART (TTL) Adapter is a simple and inexpensive way to connect PIC, AVR or ATMEGA MCUs to a PC or Mac via USB connection. FT232RL is an impressive chip because it implements full v2. 0 USB protocol, needs no external crystal, has integrated EEPROM for device ID and product description strings and comes with Royalty-Free driver
sensor Arduino analog signal read problem
The piezo element is only connected to Channel 1 (Arduino A port). The channels Ch 1 Ch 6 are connected to female mono jacks and the ground(GND) wiring is in series from jack 1, 2 and 3 so on. till the Ch 6 end to the Arduino GND port. Taped 3 times 787 0 0 0 0 0 191 0 0 0 0 0 19 0 0 0 0 0 937 123 63 5 0 0 86 0 0 0 0
arduino How to make a clean amplified microphone analog to digital conversion
Hooked up an electret mic into an opamp and gave output to my arduino microcontroller. The ADC on the microcontroller converts a range of 0 to 5 vV to a 10-bit number (0 to 1023). The problem is that the output from the latter two chips is not "clean". The analogRead() on the Arduino is always reading a non-zero value even when I make no noise...
What kind of transistor do I need to amplify an Arduinos PWM outputs
30 incandescent lightbulbs be controlled by my arduino uno on 3 channels (10 bulbs to a channel in parallel). I`ve used the arduino before to control a number of red, green and blue LEDs - I used a simple schematic using three transistors. I`m just not sure which transistors to get this time considering I`m running the bulbs from 120vAC and not...
adc Voltage Fluctuations in Arduino-opamp-thermistor circuit
arduino How to charge Polymer Lithium Ion Battery that comes with the Lilypad Development Board
There is a Lithium Polymer Ion Battery that comes with the Lilypad Development Board from Sparfun. Does anyone know if the battery charges if we plug in the battery to the Lilypad Arduino and connect the Lilypad Arduino using the FTDI at the same time. The battery specifications are in the URL below:
breadboard How does current flow through this Arduino circuit
It seems to me like the wire connected to the 5v pin is connected to the + pins of the breadboard. which are connected to nothing. There`s nothing else on the + column. I know this is a basic "google it" question, but probably due to the fact that I don`t have the vocabulary to do so I`ve not been able to find a description of current flow in an...
audio Using a microphone with an Arduino
This requires expensive hardware (microphone & amplifier) and some sophisticated audio analyizig on the microcontroller. Even a complete microphone with amplyfier circuit does not provide the desired results (according to the comments on this product) I am entirely new to the Arduino (but I`m familiar with programming). In order to built a VU...
arduino Selecting the right relay
A 5v power supply to act just like a switch. I will be controlling it with an Arduino like described here: You won`t be able to drive it directly from the Arduino pin, as most general purpose relays require at least 150mW to switch which is >30mA @ 5V. You will need to use something like this: The NPN can be just about any general purpose NPN...
Custom Arduino circuit not working
A circuit using a keypad, a servo and a few LED`s. This was connected to my Arduino Uno. Now I tried putting everything onto a single PCB and thus building my own custom "Arduino" into it. The red LED is supposed to shine and the servo must move to a certain position upon startup, but it does not happen - the servo does get power and keeps it...
arduino Circuit with switching MOSFET not working
If I disconnect the ground of the Arduino from the negative terminal of the power supply, current flows through the MOSFET, even when the switch isn`t closed!
Electric strike with Arduino circuitry
A fingerprint door lock, and the only thing that`s stopping me from purchasing the components is knowing if my setup is going to work or not. Is this an acceptable setup For the actual fingerprint reader, I was going to use this one, , which upon receiving the correct fingerprint, tell the Arduino to send power to the lock to unlock it for a...
instrumentation amplifier How to Read Wheatstone Bridge negative voltage with Arduino
A half bridge setup with strain gages and a INA126 to amplify the voltage. I can read the voltage fine when the lever is bent one way, but when beding the lever in the opposite direction I don`t get any reading. I`m guessing it`s because the voltage is negative. Is there a way to read the voltage when the lever is bent in either direction or...
arduino Electret Microphone preamplification will it work for dynamic type microphone
The circuit is okay (not ideal for quality but it will work), but there`s one small issue if you want to feed the output to your Arduino. As shown, the output will swing below ground (i. e. it will be biased at 0V) and your Arduinos analog input will only accept positive voltages. The voltage divider is made from R2 and R4, and it biases (read "hol
ultrasound How do I drive an ultrasonic transducer with an Arduino
A cat deterrent with an Arduino, something akin to this. I have figured out detection, and now realize that I need to use an ultrasonic transducer to produce the `blast` that I need.
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...
DIY HV Variable Capacitor
DIY PMA Alternator Plans
Digital Signal Integrity