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Piano with Coke Can
Spectrum Analyzer with ESP8266, MSGEQ7, WS2812 and Websocket Control
Voice-Controlled Locking Device
Muffsy Phono Preamp - Kit
NANOSOUND DAC PRO
Frequency Response
Amplifier Classes
2x3-W Mini Sound Card
60-watt amplifier circuit
Op-amp Circuits
Transistor amplifier
Stereo headphone amplifier
Log amplifier
Cascode amplifier
Simple Arduino Audio Player and Amplifier with LM386

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Populat Posts

How to make Powerful Wifi Repeater with NODE-MCU-ESP8266

If you have LOW WiFi SIGNAL Many peoples facing this problem everyday life we can't use the internet at its high speed when signal too low everything needs the internet. Smart TV, Smart Phone, Laptop, Desktop Computer But! One WiFi connection ?????? How can we access the internet at every corner of the house (If large house) it's not sufficient to cover the range! Every footstep reduce the signal of WiFi And it's also not good for multi-story Building So what is the solution to this problem Solution # WiFi Repeater !!!!! Yes, Repeater is the only solution to this problem A WiFi repeater or extender is used to extend the coverage area of your WiFi network. It works by receiving your existing WiFi signal, amplifying it, and then transmitting the boosted signal. With a WiFi repeater, you can effectively double the coverage area of your WiFi network - reaching far corners of your home or office, different floors, or even extend coverage to your...

Arduino Nano connecting by Bluetooth using a HC-05 and HC-06

In this post I show how to set up the HC-05 to always connect to the same HC-06 (or HC-05 in Slave mode). For this we use PAIR, BIND, and LINK. I am using 2 separate Arduino IDEs; version 1.6.3 which is installed, and version 1.0.5 which I run from a folder (it is the non-install version). This allows me to use 2 IDEs at the same time, each connected to a different Arduino. It also gives me 2 serial monitors, one for each Arduino. The modules used are the zs-040 versions of the HC-05 and the HC-06. The HC-05 has the Wavesen/HC firmware 2.0-20100601 and any module running the same firmware will be the same. The HC-05 has 2 AT command modes which I refer to as “mini” AT mode and “full” AT mode and some commands only work when in “full” AT mode. To enter “full” AT mode pin 34 needs to be HIGH and kept HIGH. To accomplish this I have made a connection from pin 34 to +3.3v. See the diagram below (or after the jump).

2-Digit 7-Segment Display Counter with Arduino

Previous Article: Four Seven Segment Display This month’s Arduino project is to build two 2-digit 7-segment display circuits and sketches, one that counts up and one that counts up using mini push buttons. The next posts will explain the circuits and the Arduino sketches. Components: Arduino Mega or Arduino UNO 1 2-digit 7-segment display (I got a 50-piece LED display grab bag for better value (plus the fun factor!) the one I used was configured as shown) 2 Mini push-button switches 9 Resistors 100 Ohm 2 Resistors 10K Ohm 2 2N3906 transistors (PNP) 1 Solderless breadboard Jumper wires in assorted lengths Code: // www.TinkerHobby.com // Natalia Fargasch Norman // Dual seven-segment LED Display // Common Anode digit 1 pin 10 // Common Anode digit 2 pin 5 // CA1 G F A B // | | | | | -> pins and segments they control // --------- --------- // | A | | A | // F...

Metal Detector Circuit

Metal detector is a very common device that is used for checking persons, luggage or bags in shopping malls, hotels, cinema halls, etc. to ensure that person is not carrying any metals or illegal things like guns, bombs etc. Metal Detectors detect the presence of metals. There are different types of metal detectors like hand held metal detectors, walk through metal detectors and ground search metal detectors. Metal detectors can be created easily and the circuit for a basic metal detector is not that complex. In this project, we have designed a simple DIY type Metal Detector Circuit using very simple components that can be used in our homes and gardens. Circuit Diagram The following image shows the circuit diagram for the metal detector circuit. Components Required 1 x TDA0161 Proximity Detector IC 2 x 47nF Capacitors (Ceramic Capacitor code 473) 1 x 1 KΩ Resistor (1/4 Watt) 1 x 330 Ω Resistor (1/4 Watt) 1 x 100 Ω Resistor (1/4 Watt) 1 x 5 KΩ Potentiometer ...

Solar Tracker Arduino

In modern solar tracking systems, the solar panels are fixed on a structure that moves according to the position of the sun. Let us design a solar tracker using two servo motors, a light sensor consisting of four LDRs and Arduino UNO board. Circuit Diagram The circuit design of solar tracker is simple but setting up the system must be done carefully. Four LDRs and Four 100KΩ resistors are connected in a voltage divider fashion and the output is given to 4 Analog input pins of Arduino. The PWM inputs of two servos are given from digital pins 9 and 10 of Arduino.

Temperature Controlled Room Without Arduino

A Temperature Controlled System is a type of control system that automatically controls the temperature of an object or an area. Temperature Controlled with Aruino We commonly use temperature control systems in Air Conditioners, Refrigerators, geysers, etc. where the temperature is automatically adjusted as per the input settings. In order to implement a temperature control system, we need a temperature sensor, a controller, and a cooling system. In this project, we have implemented a simple Temperature control system using simple components. The aim of this project is to automatically turn on or off the fan by detecting the surrounding temperature. The hardware requirements for this simple temperature control system are: LM35, L293D, LM358, a fan and a few passive components (Resistors). Circuit Diagram Required Components 1 x LM35 Temperature Sensor 1 x LM358 Op – Amp 1 x L293D Motor Driver IC 1 x 12V DC Fan 1 x 10 KΩ Resistor (1/4 Watt) 1 x 5 K...

Gas Leakage Detector using Arduino and GSM Module with SMS Alert and Sound Alarm

Gas Leakage Detector using Arduino and GSM Module with SMS Alert and Sound Alarm . We have published an LPG Sensor Project using Arduino and MQ5 sensor before – which senses LPG leak and produces a sound alarm. The project also has a relay system which turns ON or OFF a particular device upon gas leak (say we can turn the main electrical supply OFF upon gas leak to prevent fire). So let’s come to our project! Objectives of the Project Detect Gas Leakage (like LPG leak, Butane leak, Methane leak) or any such petroleum based gaseous substance that can be detected using MQ5 Sensor. Setup an SMS based Alert Mechanism and send 3 SMS (3 alert messages) to 2 specified mobile numbers (input inside the Arduino program) Produce a sound alarm upon a gas leak and stop the alarm once the gas leak is under control (gas presence in the atmosphere is under normal range) Display status in an LCD using a 16×2 LCD module. Let's begin to build ...

Sensors for Water flow (both direction)

Sensirion introduced SLF3S-0600F Liquid Flow Sensor , a new sensor variant that can measure even the very low flow rates up to ±3000 µl/min for both water and hydrocarbon-based fluids in both directions. The SLF3x series combines the low flow rate sensing with radically optimized mechanical design, with this SLF3x takes the well-established functionality to the next level in the price-performance ratio. In combination with its excellent signal-to-noise ratio and the unprecedented turn-down ratio of 300:1, it allows real-time monitoring of any fluidic system, which improves process control and enables advanced failure detection. The new liquid flow sensors of the SLF3x series are based on Sensirion’s proven CMOSens Technology and optimize costs by simplifying the design without sacrificing the easy fluidic, electrical, and mechanical connections. The straight and unobstructed flow channels have no moving parts ; inert wetted materials provide outstand...

Make a cluster computer with a Raspberry Pi and four Pi Zeros

ClusterHAT is an ingenious solution to the problem of building a cluster computing. Learning distributed computing is something of a challenge, and this small hardware kit is the answer. Our ClusterHAT review looks at how to build a cluster computer using a Raspberry Pi and four Pi Zero boards. This article is by Lucy Hattersley and appears in The MagPi – The Official Raspberry Pi magazine issue 55. Click here to download your free copy . Building a computer cluster is one of the most impressive Raspberry Pi projects. And being able to program cluster computers is one of the most highly valued skills in the world of big data. A cluster is a set of computers networked together and used as a single system. Each computer (or ‘node’) is scheduled to work on the same task, controlled by a master computer. Knowing how to manage, and use, clustered computers and supercomputers is a pretty valuable skill. It’s also one of the areas at ...

NEW PI ZERO WH LAUNCHED

The Raspberry Pi Foundation has launched a new Pi model, the Pi Zero WH. The difference between this edition and the current Pi Zero W is its pre-soldered GPIO header. This makes it much easier to start prototyping with a Pi Zero board because you no longer need to solder pins to the header manually. Raspberry Pi Zero WH Imagine a Raspberry Pi Zero W. Now add a professionally soldered header. Boom, that’s the Raspberry Pi Zero WH! It’s your same great-tasting Pi, with a brand-new…crust? It’s perfect for everyone who doesn’t own a soldering iron or who wants the soldering legwork done for them.

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