The RFID (Radio frequency identification) technology steps-up in the modern age in the field of access system, identification, protection system and so many places. In this project, we are using this as an door opening as well as door closing system based on the RFID card number identification. This antitheft project is built to secure […]
RFID Based Door Opening System Read More »
The cellular electronic payment described in this scenario may seem futuristic, but consider that: TheTrainLine, a British train ticket retailer, is piloting a smart-ticketing system that allows riders to link train tickets to NFC-enabled cell phones such as the Nokia 6131. The rider buys tickets online using a mobile phone or PC. At the station,
How Cellular Electronic Payments Work Read More »
I always like a challenge, so when I saw [simpleavr]s vusbtiny programmer, I started to wonder how small I could make an AVR programmer. All in all I’m pretty pleased with the result. The schematic is almost the same as the original one. I only added a LED an resistor to indicate a proper power
Minimalist AVR programmer Read More »
Whether you’re recording a podcast, musical track or field recording, you want to ensure that your audio is crystal clear every time. Condenser microphones are an excellent tool that delivers high sensitivity to capture subtle nuances and smooth frequency response [source: Apex]. Whether you’re plucking, drumming, singing or speaking, condenser microphones create high-quality audio. Read
How to Use a Condenser Microphone Read More »
The last step in my PCB design process normally is the silkscreen. When I try to design a nice helpful silkscreen, I often find my self wondering “How small can I make the text?” or “If I put this text over a via, will it still be readable?”. Usually I end up digging around some
Simple silkscreen reference board Read More »
The article How Electric Motors Work explains how brushed motors work. In a typical DC motor, there are permanent magnets on the outside and a spinning armature on the inside. The permanent magnets are stationary, so they are called the stator. The armature rotates, so it is called the rotor. The armature contains an electromagnet.
How does a brushless electric motor work? Read More »
(Phys.org) —Sometime in the future, you will be at an art gallery where you are drawn to a nice-looking tree, or haunting line drawing of a woman’s face, or historical portrait, and you will wonder who is the artist. Eye the lower corner of the canvas and it will tell you, “David.” What you might not realize is that David is a robot—e-David, to be exact
Calculating art: Meet e-David, the painting machine (w/ Video) Read More »
INTRODUCTION Using a solar panel or an array of panels without a controller that can perform Maximum Power Point Tracking (MPPT) will often result in wasted power,which ultimately results in the need to install more panels for the same power requirement. For smaller/cheaper devices that have the battery connected directly to the panel, this will
Practical Guide to Implementing Solar Panel MPPT Algorithms Read More »
Early Sitcoms Although television premiered in the early 1930s, it wasn’t until after World War Two that families began to switch over from radio. As television became popular, networks began searching for content. CBS hired a manager of program development, Worthington Minor, who sought out new ideas. Since short situational radio comedies had been popular
This is a Nordic Semiconductor system on chip with a 2.4 GHz radio and a Cortex-M0 processor. The hardware Bluetooth baseband provides raw BLE packets in a frame buffer. Nordic provides the S110 softdevice which implements a Bluetooth Low Energy stack. It also supports the proprietary protocol spoken by nRF24L01+ and nRF24LE1. Getting started Nordic
HackManhattan’s Nordic nRF51822 breakout board Read More »
