Arduino Projects and Circuits
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When Q1 is active, a larger current begins to flow through L1 to GND. When Q1 is switched off, the current through L1 trys to remain the same as it was, causing an increased voltage. By varying the PWM duty cycle, the current through L1 and output voltage.... -
This is the first color, graphic LCD display I worked with. I made some assumptions when I first began working with it. From previously working with TTL logic in college, I assumed CS and RESET could just be tied high for simplicity. It wont work if you do.... -
One incredibly simple solution to getting more sound from a micro controller is the LM386 series of amplifier chips. These can give project quality audio for less than a dollar. They even make a passable one dollar MP3 docking station and are the basis of.... -
After all job of building the prototype and making the sketch work, it`s the time to build the circuit. It`s not the objective to explain in detail how to make printed circuit boards, but only a superficial explanation about it, besides, of course, to.... -
Motor shields worked well - but they cost around $50 each, more than the Arduino itself. That`s fine for a single one, but I`m teaching an Arduino workshop (this Thursday!) for high school girls, and I needed something I could buy more cheaply so I could get.... -
This page is browser friendly, by the way. Make your browser`s window less wide than your whole screen and you will find the narrower columns much easier to read. The page is in two parts. At the top, there`s a very basic program, showing you the RFID reader.... -
I hacked together a quick and dirty Arduino MIDI-to-DMX control for our robot band Science Fiction Children. It`s really simple! And here`s how I did it. I have two really cheap LED Par56 from Stairville (DMX controlled), a simple DMX-Dimmer pack and use.... -
Control a small DC motor through this H-bridge with an Arduino Uno, but I have never programmed one of these controllers before. I need the motor to rotate in different directions when I press left and right on a keyboard. So far I have this code: // Right.... -
How to connect a buzzer to an Arduino when the buzzer operates at a different voltage to the Arduino. The circuit uses a NPN transistor for connecting the buzzer.... -
How to connect a LCD display to an Arduino and test it. This tutorial shows beginners how to use a breadboard to connect an LCD display to an Arduno, step by step.... -
A temperature sensor (MCP9700 linear active thermistor IC) and LCD are connected to the Arduino in this tutorial. The Arduino reads the temperature from the MCP9700 on analog pin A0 and displays the temperature on the LCD.... -
The Arduino reads temperature from a MCP9700 temperature sensor IC and displays the temperature in the Arduino IDE serial monitor window.... -
The Arduino displays the time and date on a LCD (optional) and in the Arduino IDE serial monitor window. A PCF8563 real time clock (RTC) IC is used to generate the time and date. The time and date can be set using the Arduino serial monitor window. An.... -
Connect eight LEDs to an Arduino and make a Knight Rider display using only two Arduino pins in this tutorial. This is made possible by using a PCF8574 I/O expander IC.... -
Arduino 7-segment display dice circuit and tutorial with Arduino sketch. Build a dice that is shaken by holding a button in and thrown by releasing the button. The shake, throw and number thrown are animated and displayed on a seven segment display.... -
Build a Knight Rider LED display on breadboard controller by an Arduino. An easy circuit for beginners in electronics using an Arduino Uno.... -
An Arduino voltmeter that displays voltage on an LCD display. The voltmeter has 4 channels for measuring four different voltages.... -
Build the tiny stripboard relay shield for Arduino. View the circuit diagram and download the software. Control two relays from your PC and use your PC to switch things on and off.... -
Flicker free updating of analog input and status of switches using Ajax and the Arduino Ethernet Shield. The Arduino Uno is set up as a web server.... -
Input and output (I/O) on the Arduino web server using the SD card. Arduino inputs (analogue inputs, switches) are displayed on a web page. Arduino outputs (LEDs) are controlled from a web page. Uses Ajax for flicker free loading.... -
Ability to control lights and fans wirelessly has long moved from being an expensive proposition to having commonplace solutions neatly packaged and available for consumers. Even then, coming up with your own custom solution is a lot of fun for hobbyists and.... -
The hardware is just an Arduino board connected via USB to a laptop. The Arduino appears as a serial device to the computer. On the Arduino board, three LEDs (red, green, blue) are mounted directly to the Arduino board using a prototyping shield like this.... -
The notes for the fourth and final class are up on the Spooky Arduino class page. At the end of the class, Mark of Machine Project bestowed upon each of the students a merit badge. It was great. Click above for a larger view of the badge. Here`s a quick.... -
The Boarduino`s small footprint made me want to see how small of a device I could whip up in an hour from some fairly complex components. So I decided to see how small the combination of a Boarduino, a Wii Nunchuck, and a hobby servo motor could be. Here`s a.... -
The minimal Arduino circuit is dead simple. It relies on the internal 8MHz oscillator (like the Lilypad Arduino). And like the Lilypad, it doesn`t include a USB-to-serial. You have to provide that with a FTDI USB-to-serial cable or with an old Arduino board..... -
The movement of the servo depends on the output value of the photoresistors. The impedance of the sensors varies with the light that incident on them. The position of the servo always changes toward the sensor with less light. There are four light sensors..... -
On the Uno boards, there`s an IC which is responsible as a USB to serial converter and it makes it possible to program the Arduino and also communicate with it from the computer. The problem here is the IC is an SMD (Surface Mounted Device). The R3 uses an.... -
Arduino Event-Driven Universal AV Remote May 1st, 2013 Turn Everything on with Airplay TL;DR - I wanted all of my AV components to turn on and .... -
The heart of the circuit consists of the Arduino microprocessor which is indicated by the header pins on the left of the circuit schematic shown on the right (click to open in new window). Two of the analog inputs (0 and 1) are connected to the emitter sides....
New Circuits
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This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of.... -
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.... -
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.... -
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.... -
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.... -
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,.... -
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.... -
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.... -
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.....
Popular Circuits
A power transistor can be used to provide a high powered zener voltage from a low wattage zener....
This circuit consists of two audio channels, a control circuit, and a hybrid irlterface circuit....
IC1 is a switching regulator that generates a 45-kHz signal that drives the gate of MOSFET Ql....
This logic probe uses a CD4009 CMOS hex inverter. The characteristic high-input impedance of...
The control module monitors the fuel tank pressure (FTP) sensor signal in order to detect vacuum...
I`ve re-drawn it to appearance the Colpitts oscillator added clearly. L is about 1. 5 uH; 19...
Crap, the sensor on my clone is low resistance and the replacement heater is 45 Ohms. Is there...
This light sensor switch circuit allows the automatic connection of a lamp when the light is low...
This tutorial continues on from ATmega8 Breadboard Circuit Part 1 where we build a small power...
The LM35 temperature sensor provides an output of 10 mV/ƒ for every degree Celsius over 0ƒ. At...
Figure 1-1 The general-purpose timer once timing of 5 minutes to 18 hours; the timing cycle from...