Find part 4 of the couse here: http://startingelectronics.org/software/arduino/learn-to-program-course/04-arithmetic-operators/
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https://www.youtube.com/watch?v=r7m8Ulzos68
Making sure that the SD card is working on the Arduino Ethernet shield (micro SD card). Find that details at: http://startingelectronics.org/articles/arduino/arduino-ethernet-shield-SD-card-testing/
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https://www.youtube.com/watch?v=PkVhUo6T72w
The hall effect sensor latches either on or off depending on the polarity of the magnet that is brought near it. Read the article for this video at: http://startingelectronics.org/articles/AH1751-hall-effect-latch
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https://www.youtube.com/watch?v=aHX0Pz5sym0
A buzzer can be connected directly to an Arduino if it is rated to operate at a low enough voltage and if it draws a low enough current. Find the circuit diagram and article at: http://startingelectronics.org/articles/arduino/connecting-buzzer-arduino-uno
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https://www.youtube.com/watch?v=JCHzinhE-Zw
Tutorial and code: http://startingelectronics.org/tutorials/arduino/web-page-to-LCD/
Send text from a web page to Arduino LCD. Text is typed into the two HTML text inputs, one per LCD line. When the button on the web page is clicked, the text is sent to the LCD. The Arduino hosts the web page on a micro SD card.
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https://www.youtube.com/watch?v=KYoZHnQ2AEY
The analog value on the Arduino analog pin A0 is changed using a potentiometer. The value read on this pin by the Arduino is used to change the rate at which the on-board LED flashes. Find the tutorial at http://startingelectronics.org/beginners/start-electronics-now/tut10-ten-arduino-projects-for-absolute-beginners/P7-analog-input
Part of a series of 20 electronics and Arduino tutorials for beginners at: http://startingelectronics.org/beginners/start-electronics-now
The Starting Electronics website contains information on how to start electronics as a hobby: http://startingelectronics.org/beginners
Part of the beginner's electronics course:
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Course Contents
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Start Electronics Now! - http://startingelectronics.org/beginners/start-electronics-now/
Beginner's Tools - http://startingelectronics.org/beginners/start-electronics-now/beginners-tools/
Beginner's Components - http://startingelectronics.org/beginners/start-electronics-now/beginners-components/
Beginner's Shopping List - http://startingelectronics.org/beginners/start-electronics-now/beginners-shopping-list/
Tutorial 1: Building a Circuit on Breadboard - http://startingelectronics.org/beginners/start-electronics-now/tut1-breadboard-circuits/
Tutorial 2: Transistor Timer Circuit - http://startingelectronics.org/beginners/start-electronics-now/tut2-transistor-timer/
Tutorial 3: Starting with Arduino - http://startingelectronics.org/beginners/start-electronics-now/tut3-starting-with-arduino/
Tutorial 4: Arduino Knight Rider - http://startingelectronics.org/beginners/start-electronics-now/tut4-arduino-knight-rider/
Tutorial 5: 555 LED Flasher - http://startingelectronics.org/beginners/start-electronics-now/tut5-555-LED-flasher/
Tutorial 6: Rising Pitch Siren - http://startingelectronics.org/beginners/start-electronics-now/tut6-rising-pitch-siren/
Tutorial 7: Arduino Melody - http://startingelectronics.org/beginners/start-electronics-now/tut7-arduino-melody/
Tutorial 8: Dual LED Flasher - http://startingelectronics.org/beginners/start-electronics-now/tut8-dual-LED-flasher/
Tutorial 9: Using the Arduino Serial Port - http://startingelectronics.org/beginners/start-electronics-now/tut9-using-the-arduino-serial-port/
Tutorial 10: Ten Arduino Projects for Absolute Beginners - http://startingelectronics.org/beginners/start-electronics-now/tut10-ten-arduino-projects-for-absolute-beginners/
Tutorial 11: Light Activated Alarm - http://startingelectronics.org/beginners/start-electronics-now/tut11-light-activated-alarm/
Tutorial 12: Arduino LCD - http://startingelectronics.org/beginners/start-electronics-now/tut12-arduino-LCD/
Tutorial 13: Wailing Siren - http://startingelectronics.org/beginners/start-electronics-now/tut13-555-wailing-siren/
Tutorial 14: Ardu
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https://www.youtube.com/watch?v=GK88Fmh03tw
Find the details at: http://startingelectronics.org/tutorials/AVR-8-microcontrollers/ATtiny2313-tutorial/P7-system-clock/
The CKOUT fuse bit is set, making the system clock available on pin 6 of the microcontroller.
The system clock is divided by 8 by default, clearing the CKDIV8 fuse bit puts the undivided clock on pin 6.
A 4MHz and 128kHz internal clock source are selected by changing the fuse options in the Atmel Studio dialog box.
The current system clock can be seen on the oscilloscope.
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https://www.youtube.com/watch?v=BYhDK_lqbLs
Find the circuit diagram and code for this project here: http://startingelectronics.org/software/processing/software-voltmeter/
This is a better view of the software used in the Arduino software voltmeter video: http://www.youtube.com/watch?v=06ISQ3J6xUg
The software is written in the Processing Language: http://processing.org
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https://www.youtube.com/watch?v=CyG7cOjE1ak