e-book Whats a Microcontroller Student Guide Version 2.2

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Student Guide. VERSION What's a Microcontroller? is the gateway text in to the Stamps in Class program. To see the full series In addition, small errata items noted in the previous version () have been corrected. The material still.
Table of contents

A simple flex sensor 2. As the sensor is flexed, the resistance across the sensor increases.

Build Your Own Mini Timer

Patented technology…. A simple flex sensor 4. Flex sensors are available in two sizes: one 2. By combining the flex sensor with a static resistor to create a voltage divider , you can produce a variable voltage that can be read by a microcontroller's analog-to-digital converter.


This tutorial serves as a quick primer on flex sensor's, and demonstrates how to hook them up and use them. Aside from the sensor, the following materials are recommended:. Arduino Uno -- We'll be using the Arduino's analog-to-digital converter to read in the variable resistance of the sensor. Resistor Kit -- To turn the flex sensor's variable resistance into a readable voltage, we'll combine it with a static resistor to create a voltage divider.

This resistor kit is handy for some trial-and-error testing to hone in on the most sensitive circuit possible. Breadboard and Jumper Wires -- The flex sensor's terminals are breadboard-compatible. We'll stick that and the resistor, then use the jumper wires to connect from breadboard to Arduino. Resistors are a good thing, in fact, they're actually crucial in a lot of circuit designs.

The only problem seems to be that ….

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This is your tried and true white solderless breadboard. It has 2 power buses, 10 columns, and 30 rows - a total of tie i….

If you need to knock up a quick prototype there's nothing like having a pile of jumper wires to speed things up, and let's fa…. Analog components, like these flex sensor's, are a great sensor-reading entry-point for beginners, but there are a few electronics concepts you should be familiar with. If any of these tutorial titles sound foreign to you, consider skimming through that content first. Before we get to circuit-building and Arduino-programming, here's a quick rundown of the flex sensor's important electrical characteristics.

One side of the sensor is printed with a polymer ink that has conductive particles embedded in it.


When the sensor is straight, the particles give the ink a resistance of about 30k Ohms. When the sensor straightens out again, the resistance returns to the original value. By measuring the resistance, you can determine how much the sensor is being bent. The flex sensor is designed to be flexed in just one direction — away from the ink — as demonstrated in the image below. Flex sensor bend direction from SpectraSymbol Datasheet. Bending the sensor in the other direction will not produce any reliable data, and may damage the sensor. Also take care not to bend the sensor close to the base, as they have a tendency to kink and fail.

The simplest way to incorporate this sensor into your project is by using it in a voltage divider. This circuit requires one resistor.

It also contains a message area, a text console, a toolbar with buttons for common functions and a hierarchy of operation menus. The Arduino IDE supplies a software library from the Wiring project, which provides many common input and output procedures. User-written code only requires two basic functions, for starting the sketch and the main program loop, that are compiled and linked with a program stub main into an executable cyclic executive program with the GNU toolchain , also included with the IDE distribution. The Arduino IDE employs the program avrdude to convert the executable code into a text file in hexadecimal encoding that is loaded into the Arduino board by a loader program in the board's firmware.

A sketch is a program written with the Arduino IDE. Arduino Software IDE pre Most Arduino boards contain a light-emitting diode LED and a current limiting resistor connected between pin 13 and ground, which is a convenient feature for many tests and program functions.

This program uses the functions pinMode , digitalWrite , and delay , which are provided by the internal libraries included in the IDE environment.

Andy Lindsay (Author of What's a Microcontroller?)

The open-source nature of the Arduino project has facilitated the publication of many free software libraries that other developers use to augment their projects. The Arduino project received an honorary mention in the Digital Communities category at the Prix Ars Electronica. From Wikipedia, the free encyclopedia.

Open source hardware and software platform.

What's a Microcontroller? Student Guide Version 2.2

For other uses, see Arduino disambiguation. For other uses, see Lily pad disambiguation. Further information: List of Arduino boards and compatible systems. Adafruit Motor Shield with screw terminals for connection to motors. Free and open-source software portal Electronics portal. IEEE Spectrum. The Wall Street Journal.

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Retrieved Adafruit Industries. May 15, April 5, Electronics Weekly. State of Massachusetts. Maker Media, Inc. Retrieved 21 April Archived from the original on Retrieved 20 February Retrieved 17 May Arduino Blog. Retrieved 19 Jan Arduino Project.

Retrieved 29 November Retrieved 5 Nov Retrieved 23 June Nov 8, Building and Environment. Single-board computer and single-board microcontroller. P88 5. P91 5. P95 6. P99 6. P 6. P 7. P 8. Chapter 1 9. Chapter 1 : Introduction 2 1.

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Chapter 1 : Introduction 3 In this book we will talk about our project, why we choose it, its main idea, its internal component, and problem we faced and how we overcome them. Nowadays we suffer from the spread of infectious diseases, but the biggest problem is the transmission of these diseases in hospitals themselves. In our project we try to find answer to this question We search a lot until we got that a large proportion of medical errors came from nurses' errors. Nurses could make mistakes in medicines' times or in amount of required dosage of the drug.