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Constant current resistive load controlled by Arduino
Inspired from one of Dave Jones EEVBlog videos on dummy load, Lee has built his own programmable constant current resistive load that allows you to draw a set current from any power supply source. His...
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Google’s Littlebox Challenge offers $1,000,000 prize for designing a smaller...
Google and IEEE have jointly announced the Littlebox Challenge, offering One million US dollar prize for designing the most efficient and compact size inverter that would convert direct current from...
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Autonomous fire extinguisher
Trevor Slaton and Dawn Xiang, students from Cornell University, designed this autonomous fire extinguisher that is capable of detecting fires through photo sensors and aiming a water nozzle along two...
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Another PIC-based digital thermometer and clock
This DIY digital clock plus thermometer is designed by Joe Farr and is based on PIC18F25K22 microcontroller. The complete construction details of this project including circuit diagrams, PCB layouts...
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Solar powered beach buddy charges phone, plays music, and computes sunburn...
This 3-in-1 Beach Buddy is a solar charger, audio amplifier system, and sunburn timer calculator. Based on your skin type and the Sun protection factor (SPF) of the sunscreen you are using, the Beach...
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Smart LED lighting system
This Application Note from Maxim describes the implementation of ambient light sensing, communication, and energy measurement into LED lighting systems for energy conservation and lower operating...
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Arduino LED clock
This Instructable describes building of a fun and very simple LED clock using Arduino that displays the time to the nearest half hour using LEDs. LED clock
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Q&A concerning Microchip’s MCP79XXX RTC chips
If your design contains Microchip’s MCP79XXX series RTC chips and you are running into troubles using them, this technical brief is intended to resolve several of the commonly-asked questions regarding...
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OpenHardwareExG: An open source platform for ECG, EEG, EMG, ENG, and EOG...
The OpenHardwareExG project is aimed to develop an open source hardware and software platform for electrophysiologic signal processing applications, including ECG, EEG, EMG, ENG, and EOG. The current...
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Ultrasonic distance measurements for parking-assistance systems in automotive
Parking assistance systems are becoming a common feature in modern day cars to enhance safety and driver convenience. These systems use ultrasonic transducers and a microprocessor unit to compute the...
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Frequency measuring techniques
Measuring input signal frequency is a common requirement in many applications like tachometer, frequency meter, tone detection, etc. The two classic approaches of frequency measurement are measure the...
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PIC12F683 based battery charger
Here’s an Instructable about a DIY charger for car’s battery with an analog DC ammeter in the front panel. A PIC12F683-based control circuit is enclosed inside which adds some intelligence to this...
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Handsfree video recording goggles
Hans de Bruin’s DIY handsfree goggles allows you to record HD video of what you are seeing while having both hands free. He is using big safety goggles as the framework. He has removed the glasses and...
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Self-organizing Kilobots
The Self-organizing Systems Research Group at Harvard has created a “thousand robot swarm“, named Kilobots, which can self-arrange themselves into shapes and patterns. Each robot in the group moves...
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XMega I/O Ports
Any microcontroller must have I/O pins for taking inputs and providing outputs. The ATXMega32A4U just like any other micro has 34 programmable I/O pins divided unevenly amongst six IO ports. Most I/O...
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STM32 Programming Tips and Tricks
I remember that once in the beginning I said that I don’t want to buy a programmer/debugger hardware for learning a new MCU like the STM32 and also STM32s already come with built-in bootloader to...
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Solar microinverter
This application note describes a DC-to-AC converter design, specifically targeted at converting highly variable energy from a solar panel into a form that can be directly connected to the power grid....
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Keep yourself updated in real-time with NoteU
Noteu is an Arduino-based real-time display designed to notify the user of anything from the computer including the CPU speed, reminders for the meetings scheduled in the user’s Google Calender,...
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Infra-red controlled smart AC outlet
Infrared remote control for home appliances is a popular project among hobbyists and students. Smart Outlet is a similar project that provides an infrared controlled AC outlet to connect any electric...
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Arduino quiz show buzzer
This nicely-built quiz game buzzer system is Arduino-based and captures the fastest player or “first to respond” out of four players. Quiz game controller A good friend of mine who’s a teacher was...
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