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Build an electric guitar tuner using Arduino
Check this latest instructable on making an Arduino guitar tuner. The audio signal from an electric guitar is amplified and fed to an ADC channel of Arduino, which further processes the signal to...
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Arduino-controlled plant watering system
Here is another automatic plant watering system using Arduino. The system continuously senses the moisture condition of soil and activates the water pumping system if the soil condition is too dried....
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Automatic re-filler for your pet’s water bowl
This Arduino-based Pet Water Warden helps your pets to get enough water supply when you are gone. It uses two homemade dip probes to sense the water level in a pet’s drinking bowl and automatically...
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Free PCBs for open source projects
Electronics-Lab has announced to provide 5 pieces of free PCBs for your design if you open-source and publish your project on their website. Free PCBs for Open Source Projects Get a professionally...
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Microchip’s new PIC32 Bluetooth® Audio Development Kit
Microchip has announced the new PIC32 Bluetooth® Audio Development Kit that enables custom application development on the PIC32 microcontrollers (MCUs) for Bluetooth and USB digital audio solutions....
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Nickelphone: Coin-based Midi Keyboard
Tyler Bletsch’s Nickelphone is a coin-based music keyboard that has 15 nickels and 10 pennies arranged on a traditional 25-key piano-style layout and act as touch sensors. It can emit simple square...
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Bi-color LED matrix display board with Bluetooth
I shared the details of my single-color 8X40 LED matrix display board project here a few months ago. Here is a nice instructable on making a 7 Bi-color 8×8 LED Matrix Scrolling Text Display with...
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Solar-powered outdoor weather station with PC logging and graphs
I have always enjoyed reading/doing projects that involve sensing various environmental parameters and recording them. This Solar-powered outdoor weather station built upon the Arduino platform...
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Yet another voltage monitor for car’s battery
A couple of years ago I built a digital voltage monitor system for my car’s battery and its charging system. It plugs into the car’s cigarette lighter receptacle and displays the instantaneous output...
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Rapid Development Board for PIC12F Series Microcontrollers
The 12F series of PIC microcontrollers are handy little 8-pin devices designed for small embedded applications that do not require too many I/O resources, and where small size is advantageous. These...
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Web-controlled AC outlets
This Instructable describes the hardware hacking of Stainley’s remote controlled power outlet and modifying it to make it controllable through web or smartphone using Electric Imp. The Electric Imp is...
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Tutorial on Advanced Arduino Sound Synthesis
The easiest way of producing a sound using an Arduino board is by bit-banging its I/O pin driving a buzzer or speaker. However, if you want to go beyond simple beeps and synthesis complex and more...
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DIY Bluetooth-controlled relay switch
Here is a nice instructable on building a Bluetooth-controlled dual channel relay switch using Atmega328 MCU and a cheap HC-06 Bluetooth module. You can use this device to control various appliances...
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DIY Variable DC Power Supply with Display and PC interface
A variable bench power supply is an important equipment in electronics lab for conducting experiments, prototytyping, and testing. This cool-looking DIY bench power supply provides fixed 5V and 12V...
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Special hearing aid for high frequency hearing loss
A person suffered from high-frequency hearing loss has reduced ability to hear high frequency sounds. This has direct impact on his/her ability to understand speech because most of the commonly used...
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Reviewing Dorji’s DSTH01 digital temperature and humidity sensor module
A couple weeks ago I received some sample products from Dorji Applied Technologies, a china-based company that make varieties of RF and sensor modules. One of the products I received was their latest...
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Making a mini LED Christmas tree
My two and a half year old son loves toys with flashing lights. For this Christmas I thought of making a mini LED Christmas tree for him. This project uses 22 multi-color LEDs which are driven by a...
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Heated diode as a flow sensor
I found this design idea posted on EDN website, which is about using an externally heated semiconductor diode as an air or fluid flow sensor. The idea is airflow across the heated diode reduces its...
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Basic design considerations for a radio system
This tutorial from Maxim describes the standard process of designing a radio system and various tradeoffs involved in the process. The process of designing a radio system can be complex and often...
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Acoustic navigation aid for visually impaired people
Shane Soh and Eileen Liu, students at Cornell University, designed this acoustic wayfinding device to assist visually impaired persons with navigation. It uses two ultrasonic range finders; one is...
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