QuickIntroduction to Arduino and Sensors
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This document provides an introduction to Arduino and sensors. It discusses that Arduino was originally developed for artists and designers to prototype interactive displays. It then describes the Arduino Uno board and lists some example components that are good for beginners to start with such as LEDs, LCD screens, temperature sensors, servos, and ultrasonic sensors. The document emphasizes starting with simple projects and building confidence before moving to more complex projects. It also provides some example approaches, resources, and recommended books for learning Arduino.
QuickIntroduction to Arduino and Sensors
- 1. A Quick Introduction to Arduino and Sensors
- 2. Why Was Arduino Developed? •Physical Computing – using components that can interact with people and with the world around us •The Arduino was originally developed for artists and designers to prototype interactive displays –Developed for non-scientists –Minimalist programming –“Forgiving” circuitry that can handle a wide variety of wiring errors
- 3. Different Varieties of Arduino
- 4. Arduino Uno Revision 3 USB connection 7-12 volt input power (9v is common) Power pins Analog input / Digital input or output Digital Input / Digital output (PWM on pins 3, 5, 6, 9, 10, 11)
- 5. What Can Arduino Uno Be Used To Teach? •Introductory electronics (voltage, current, resistance) •How sensors and actuators work •Rudimentary programming •Design of basic scientific equipment •Troubleshooting •Challenges of communicating with users through a project (e.g., messages, formatting numbers, ease of use, etc.) •Statistics and variation in data gathering
- 6. What Can Students Do? •Quickly able to prototype a working project •Able to produce a working computer program •The tactile “feel” of assembling a project is very rewarding; making something that works •FINALLY understanding that a scientific instrument is only as good as its design and calibration •Get to troubleshoot circuits under the tutelage of the instructor to develop a logical, orderly method.
- 7. What Approach Have I Followed? Philosophical Approach •It is physically impossible to teach students a comprehensive course in electronics in a single semester •The purpose of our electronics course is to teach the basics of instrument design, function, and troubleshooting •It is important to teach students the basics of electronics and teach them how to learn electronics on their own
- 8. What Approach Have I Followed? •Start simple – build confidence with small projects before trying complex projects •Introduce concept and then immediately do a project with it •Use components that will capture the attention and imagination of the students •Use new projects to build on previous projects •Create a “problem” for students to solve that THEY will see as practical but not overly complicated •Teach students how to search for needed information from datasheets (e.g., tolerances, current limits, etc.) from the internet
- 9. What Are Some Good Components to Start With? • LEDs….lots of LEDs with variety of colors (be sure to also acquire lots of current-limiting resistors) • Good for blinking, dimming using PWM, “Knight Rider” effect with 8 or more LEDs, strobe effects, etc.
- 10. What Are Some Good Components to Start With? • LCD Screen with backlight (16x2 is common and teaches the complications of textual display) • The parallel version uses 4 digital pins for display • Instructions for how to connect is built in as a sample “sketch” in the Arduino • Students get a huge degree of satisfaction from transmitting text to the LCD screen
- 11. Current-limiting resistors for RGB backlight 10 kW potentiometer to adjust screen contrast
- 12. What Are Some Good Components to Start With? • Basic temperature and/or humidity sensor • DHT11 or DHT22 is a good entry-level choice • Library can be downloaded and incorporated to give easy access to features of the sensor
- 13. Current-limiting resistors for RGB backlight DHT 11 Sensor
- 14. What Are Some Good Components to Start With? • Small servos • Arduino can be used to position servo at a given angle for use in projects. • Other sensors can be attached to the servo to add a layer of complexity • Servo library included in Arduino IDE
- 16. What Are Some Good Components to Start With? • Ultrasonic Ranger – uses ultrasonic waves to determine the distance between sensor and object based on time between emission of wave and echo of it. • Good for introducing discussion of speed of sound variation with environmental conditions • Calibration principles are easily discussed
- 17. Laser pointer mounted on servo that aims at a target based on readings of dual sonic rangers Sonic Rangers
- 18. What Are Some Other Components That Are Relatively Easy to Use? 128x64 Organic LED screen that can handle graphics as well as text
- 19. What Are Some Other Components That Are Relatively Easy to Use? GPS Module that can be used for a variety of purposes such as triggering a response only when the user is standing in a particular location
- 20. What Are Some Other Components That Are Relatively Easy to Use? Mechanical or Solid-State Relay Boards to control alternating current loads of several amps
- 21. AC Outlets Controlled by Arduino
- 22. Resources • www.arduino.cc :info on hardware, some libraries for sensors, the integrated development environment (IDE) and reference material on commands and structures • www.instructables.com : info on DIY projects prepared by others • www.makezine.com : Home of Make Magazine, which has lots of Arduino projects
- 23. Recommended Books By Simon Monk By John Boxall By Jeremy Blum