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Circuit Cellar - The Magazine for Computer Applications

Circuit Cellar - The Magazine for Computer Applications

http://circuitcellar.com/

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How to Connect Multiple Switches to one Microcontroller Pin - Hacked Gadgets - DIY Tech Blog When using microcontrollers you would normally connect one button to one input. What to do if you are running out of inputs and still have a bunch of buttons to monitor? This clever trick uses the analog input that many microcontrollers have available to monitor the buttons on a single input by having them put a different voltage on the pin based on which one is pressed. the Tricorder project - Science Tricorder Mark 2 The Science Tricorder Mark 2 was a wonderful adventure of discovery to develop. It's my pleasure to be able to share it with you. To introduce you to the Tricorder project, I'd like to begin with a story from the development of the very first Tricorder that I built. The first educational discoveries with the Tricorder came only moments after completing it, and walking about the workshop to "see what can't be seen".

ezLCD- Embedded GUI LCD Touch Screen $69 Special with free freight. Limited Time only. USE COUPON CODE: arlcdNOW Please choose UPS Ground on Checkout to receive free shipping. Please note: Product will ship USPS priority unless otherwise notified.SCREEN SHOT: How to obtain FREE Shipping arLCD is a full smart ezLCD GPU with the Arduino Uno R3 on the same PCB in a thin, easy to integrate package with a panel mount bezel available in the near future.

SPI Master / SPI Slave via PIC - Introduction Another widely used serial communication protocol aside from RS232 serial and I2C is called SPI, short for serial peripheral interface. SPI is extremely similar to I2C and infact many SPI devices can also read and write I2C on the same communication lines. SPI interfaces can be found in devices like sensors, motor controllers or virtually anything digital and low speed. In this tutorial the two types of SPI devices that exist in the world will be introduced: the SPI Master and the SPI Slave. The SPI Master controls the flow communication on the dataline while SPI Slave waits for contact from the Master before reading or writing data. SPI Interface Demonstration Video ChipKIT Challenge So, we have finally finished our entry, a few hours before the deadline! The competition is about building an eco friendly or renewable based circuit that uses a ChipKIT board, and is run by designspark, Elektor and Circuit Cellar. We built a maximum power tracking circuit, which performs impedance matching to transfer power out of a source efficiently.

MESH: Creative DIY Kit for the Connected Life We made several prototypes using rapid prototyping tools such as Arduino and 3D printer. We tested several user interfaces, then finally selected current one. Our team will use the resources of Sony to manufacture and deliver your order. Since this is a new type of product, and it will initially be shipped with beta software, we anticipate strong involvement of the user/"maker" community in improving it.

Getting Started with FPGAs: The Development Environment and “Hello World” Getting started with FPGA development is much like getting started with any other piece of programmable silicon. First, pick the hardware to use. Next, set up the development environment. PIC Interrupts vs. Polling - Introduction Project Info Author: Chris Difficulty: Easy-Medium Time Invested: 1 Hour Prerequisites: Take a look at the above tutorials before continuing to read this tutorial. After you've been studying and learning about embedded systems, microcontrollers and low level programming for a while, one concept you will undoubtedly cross is the topic of interrupts. Interrupts are used to interrupt the main program cycle to perform a quick and higher priority task so they are typically used when more than 1 input and output exists. This tutorial will use a simple example to show you how to include an externally generated interrupt to tell the PIC to run a higher priority task.

SecretsOfArduinoPWM Learning Examples | Foundations | Hacking | Links Secrets of Arduino PWM by Ken Shirriffwith further editing by Paul Badgerthe original document Pulse-width modulation (PWM) can be implemented on the Arduino in several ways. This article explains simple PWM techniques, as well as how to use the PWM registers directly for more control over the duty cycle and frequency.

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