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Electronics Projects: How to Program Music on a BASIC Stamp

With your BASIC Stamp processor, PBASIC commands and a piezo speaker, you can make your electronics projects sing. Here is a sample program that plays two songs on a piezo speaker: [more…]

Electronics Projects: How to Connect a Servo to a BASIC Stamp

To create motion, you can add a very useful device, called a servo, to your electronics project. A servo is a special type of motor that is designed to rotate to a particular position and hold that position [more…]

Electronics Projects: How to Program a Servo in PBASIC

To create motion in your electronics project, you can add a very useful device, called a servo, which lets you control mechanical motion with a BASIC Stamp program. A [more…]

Electronics Projects: How to Use a Piezo Speaker with a BASIC Stamp

You can add interesting sound effects and simple music to your electronics projects using the BASIC Stamp Activity Kit. The kit comes with a small piezoelectric speaker, which you can connect directly [more…]

Electronics: Introduction to Infrared Light

Many electronic circuits detect the invisible light that’s commonly called infrared. Infrared light is light whose frequency is just below the range of visible red light. Specifically, infrared is light [more…]

Electronics Components: How to Detect Infrared Light

There are several ways to detect infrared light in an electronic circuit, but the most common is with a device called a phototransistor. You can buy a phototransistor for less than a dollar at RadioShack [more…]

Electronics Projects: How to Use Comments in PBASIC Code

If you are using a BASIC Stamp to control functions of an electronics project, you will be writing code in Parallax BASIC (PBASIC). Using comments in your code will help you to remember what each little [more…]

Digital Electronics: Vixen for Parallel-Port Control

If you want to create elaborate scripts for controlling devices connected via a computer’s parallel port, you should look into Vixen, a free software program that makes it easy to sequence your parallel [more…]

Control Your Electronics through a Parallel Port

Don’t throw away that old computer! If it has a parallel port, you can use it to control your electronic gadgets. Until a few years ago, all computers came equipped with a [more…]

Digital Electronics: Pinout Assignments for a Parallel Port

The pins on a parallel port that you’re most interested in for your electronics projects are pins 2 through 9 — the eight data pins that are collectively called the [more…]

Digital Electronics: How to Design a Parallel-Port Circuit

Each of the eight data output pins on a parallel port provides 5 V DC to your electronic circuit. That amount of voltage can source about 10 mA or 12 mA — enough to drive an LED directly. Alternatively [more…]

Digital Electronics: DB25 Connectors in a Parallel-Port Circuit

To build your own electronic circuits that interface with a parallel port, you need to use a DB25 connector that attaches to your electronic circuit. The standard parallel port on a computer uses a DB25 [more…]

Digital Electronics: Control Parallel-Port Output from an MS-DOS Prompt

You need some special software on the computer to send data to the parallel port to control the functions of your electronic circuit. Fortunately, you don’t have to be a programmer to create this software [more…]

Digital Electronics: Kit 74 DOS Commands

When controlling your electronic projects through a parallel port, the Kit 74 DOS software consists of three commands — RELAY, DELAY, and WAITFOR — that you can run from a command prompt. [more…]

Digital Electronics: How to Create a Command Script in Kit 74 DOS

Kit 74 DOS software, used to control your electronic projects through a parallel port, consists of three commands — RELAY, DELAY, and WAITFOR. You can easily create command scripts that can execute a series [more…]

Digital Electronics: Seven-Segment Displays

A seven-segment display is an electronic array of seven LEDs arranged in a way that can display numerals as well as some alphabetic characters. You can purchase an inexpensive [more…]

Electronics Projects: Build a Seven-Segment Display Countdown Timer

This electronics project presents a breadboard circuit that connects a seven-segment display to seven of the eight output pins of a parallel port. You need a computer with a parallel port and the Kit 74 [more…]

Electronics Projects: How to Build a Motor Driver

This project presents a breadboard circuit that drives a small 3 V DC motor from a parallel port. Because this motor uses much more current than a parallel port can handle, a ULN2003 darlington array IC [more…]

Electronics Projects: How to Use a Kit 74 Relay Controller

One of the best ways to interface your electronic gadgets to a computer via the parallel port is with an inexpensive build-it-yourself kit called the Kit 74. You can purchase this kit from various sources [more…]

Electronics Projects: How to Build a Common-Emitter Proximity Detector

The combination of an infrared light-emitting diode (IR LED) and a photodiode is often used as a proximity detector, an electronic gadget that detects when an object is nearby. [more…]

Electronics Basics: What is a Latch Circuit

A latch is an electronic logic circuit that has two inputs and one output. One of the inputs is called theSET input; the other is called theRESET input. [more…]

Electronics Projects: How to Build a Latch Circuit

Electronic latch circuits can be either active-high or active-low. The difference is determined by whether the operation of the latch circuit is triggered by HIGH or LOW signals on the inputs. [more…]

Electronics Basics: What is a Gated Latch

In the field of electronics, a gated latch is a latch that has a third input that must be active in order for the SET and RESET inputs to take effect. This third input is sometimes called ENABLE because [more…]

Electronics Projects: How to Build a Gated Latch

This electronics project shows you how to build a gated D latch using two 4011 Quad 2-Input NAND gates. Two 4011 chips are required because the NAND gate requires a total of five gates [more…]

Digital Electronics: What is a Flip-Flop?

In the parlance of electronics, a flip-flop is a special type of gated latch. The difference between a flip-flop and a gated latch is that in a flip-flop, the inputs aren't enabled merely by the presence [more…]

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