Blog Archives
Posted on 07 May 2008
NedLog writes:The HandySwipe provides a portable magnetic card reader interface and display. It collects card data from a “Type 2″ card reader (shown here), and displays the data on a small character LCD screen. Type 2 stripes are by far the most common in use, such as on credit cards and drivers’ licenses. The device can store up to 50 cards, runs on four AA’s, and has a serial connection to download its memory to your computer in CSV format. It can also download data in a raw bistream format compatable with StripeSnoop, so you can take advantage of StripeSnoop’s powerful parsing and analysis features .[more]
Posted on 29 Apr 2008
This document explains how to interface a variety of devices to the Red Dot Cricket including:A DC motor. Resistive sensors, such as a photocell-based light sensor or a pushbutton switch. An infrared reflectance sensor. First, proper connector wiring technique, applicable to all devices is explained. Then individual wiring diagrams for each of the devices are presented. Finally, supplier information is given[more]
Posted on 16 Mar 2008
Sometimes you only need a simple and cheap RS232 terminal to get sufficient control over a PC or a RS232 device. There is no need, no space or even no power to place a monitor, a computer case and a keyboard. Maybe there exists also the problem, that the PC or the device is located somewhere else and you want to interact with it over a short distance.The cheapest way to obtain a complete user interface is the use of standard components, such as LCD modules and PC keyboards.[more]
Posted on 20 Feb 2008
This is AVR-based Thermometer project.The sensor for this project is TC77 which is a serially accessible digital temperature sensor. Temperature data is converted from the internal thermal sensing element and made available at anytime as a 13-bit two’s compliment digital word. Communication with the TC77 is accomplished via a SPI and MICROWIRE compatible interface.[more]
Posted on 01 Feb 2008
This kind of display is usually controlled via RS232. This has the disadvantage of being very slow and the display data is limited to simple text messages only with the microcontroller of the display doing the actual text drawing.[more]
