1. Welcome to Week 4 at the Summer Computer Club Raspberry Pi (contd)

2. Homework - Week3 Go through Khan Academy https://www.khanacademy.org/science/computer-science/v/introduction-to-programs- data-types-and-variables Binary Numbers Python lists For loops While loops Fun with strings Factorial Program (Simple) Flowchart Two programs: 1. Hello world, printing Hello to all students in the Friends Computer club with as few lines of code as possible 2. Simple Factorial Program that takes a number from user and computes its factorial. 3. Calculator (Holiday week)

3. Electronics in depth Instructional Videos (Watch out for more from Adafruit Videos) A For Ampere B for Battery Circuit Playground Explaining Electrical Circuit

4. Basics Breadboard (http://learn.adafruit.com/lesson-0-getting- started/breadboard)http://learn.adafruit.com/lesson-0-getting- started/breadboard Breadboard is a way of constructing electronics without having to use a soldering iron. Components are pushed into the sockets on the breadboard and then extra 'jumper' wires are used to make connections. LED Light emitting device Resistor Limit current through circuit

5. Your first Pi program to light an LED Step1: Draw a circuit Step2: Map it to the Breadboard. Where is Python in all this? Step3: Use the logic inside your program to act as the battery source

6. Sample program to light an LED

7. Pseudo code to light an LED 1.Import libraries containing functions [import …] 2.Initialize GPIO pins [GPIO.setmode(GPIO.BCM)] 3.Setup LED name and pin [RED_LED=23] 4.Configure LED to be output [GPIO.setup(RED_LED, GPIO.OUT)] 5. Enable pin [GPIO.output(RED_LED,True)]

8. Homework – Week 4 Build a 3 bit binary display using Red, Green, Blue LED’s. Requirements Request user for a number between 0 and 7 (All others should be appropriately rejected) Convert number to 3 bit binary format. Display Most Significant Bit as Red, Middle Bit as Green and Least Significant Bit as Blue. (Ex: Number 5 would convert to Red:On, Green:Off, Blue:On and the number 4 would convert to Red:On, Green:Off, Blue:Off) Three things needed for homework to be complete Circuit Diagram – One is enough, which will be the same for all 3 LED’s. Use resistor of 10K ohms in the diagram. Bread board connectivity diagram. – Ground is on 3H. – Pin 18 (Red LED) is on 6H – Pin 23 (Green LED) is on 8H – Pin 24 (Blue LED) is on 9H – Cobbler spans from Row 1 to Row 15. Python Code to display the LED’s. – Initially as a test use prints to display which LED’s would be on and off.