Create README.md

project11/README.md

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+## Raspberry Pi Start Kit - Lesson 13, 14, and 15 Incremental Changes
+
+With this project we are going to start with the 1602 LCD display functionality of
+Lesson 13. Then we will add Lesson 14 using the tilt switch along with Lesson 8
+using the active buzzer. Then we will improve the product by adding the
+material of Lesson 15.
+
+[Raspberry Pi Starter Kit Lesson 8: Raspberry Pi Drive Active Buzzer](http://osoyoo.com/2017/06/28/raspberry-pi-3-buzzer/)
+
+[Raspberry Pi Starter Kit Lesson 13: I2C 1602 LCD](http://osoyoo.com/2017/07/03/raspbery-pi3-drive-i2c-1602-lcd/)
+
+[Raspberry Pi Starter Kit Lesson 14: SW520D Tilt Switch with Raspberry Pi](http://osoyoo.com/2017/06/19/raspberry-tilt-switch/)
+
+[Raspberry Pi Starter Kit Lesson 15: Raspberry Pi, Potentiometer and LCD](http://osoyoo.com/2017/07/04/raspberry-pi-potentiometer/)
+
+### Starting the project series - Lesson 13 with Lesson 9
+
+The first step is to take the materials developed in project 10 with the 1602 LCD display as a
+starting position and add to that solution the materials developed in project 05 with the
+active buzzer.
+
+The displayed text will contain a counter that is incremented. Each time the 1602 LCD display text
+is changed the buzzer will emit a short tone. The tone will vary depending on the value of the counter
+mod 5 so there will be a total of 5 different tones which are emitted in a series which is then
+repeated.
+
+### Next phase - Adding Lesson 14
+Adding Lesson 14 involves adding the tilt sensor to the circuit. Using the tilt sense allows us an
+additional mode of user interaction, tilting or rotating the board in one plane so that the tilt
+switch indicates that the board has changed its position.
+
+Text is displayed on the 1602 LCD Display to indicate the tilt sensor readings. In addition the buzzer
+is sounded as tilts are detected.
+
+### Final phase - Adding lesson 15
+
+In the final phase a potentiomter is added to allow a voltage output detected by a pin to be varied.
+As the potentiometer is manipulated the voltage detected is displayed on the 1602 LCD Display. The
+buzzer is used to provide aural feedback by changing the tone emitted based on the voltage level
+of the potentiometer.