SENDING BINARY MESSAGES WITH THE INTERNET SIMULATOR UNIT 1: LESSON 3 SENDING BINARY MESSAGES WITH THE INTERNET SIMULATOR

Vocabulary Words: Bandwidth - Transmission capacity measure by bit rate Bit - A contraction of "Binary Digit"; the single unit of information in a computer, typically represented as a 0 or 1 Bit rate - (sometimes written bitrate) the number of bits that are conveyed or processed per unit of time. e.g. 8 bits/sec. Latency - Time it takes for a bit to travel from its sender to its receiver. Protocol - A set of rules governing the exchange or transmission of data between devices.

OPEN CODE. ORG AND FIND THIS LESSON OPEN CODE.ORG AND FIND THIS LESSON. WRITE THE VOCABUARY WORDS ON YOUR INDEX CARDS, ONE TERM PER CARD. WORD ON THE FRONT, DEFINITION ON THE BACK.

In the last lesson you learned how to make your own binary devices In the last lesson you learned how to make your own binary devices. We can compose any number of messages by sending a sequence of states.

To interpret the message we need to know: 1 To interpret the message we need to know: 1. Which signal meant A and which meant B 2. some kind of mapping between sequences of signals and a possible message

You were developing a COMMUNICATION PROTOCOL This means you govern how devices should transmit and interpret data. Rules and procedures.

BINARY SIGNAL TEST LOOK AT THE PRESENTATION: FLASHLIGHT BINARY SIGNAL TEST – PRESENTATION https://docs.google.com/presentation/d/1juvbxu1begVxgiVcGMHsGv4QuunxdHFJwT-TVR8wZuc/edit#slide=id.g12976fcfcc_0_71

WHAT ASSUMPTIONS WERE YOU MAKING WHEN INTERPRETING THE SIGNALS WHAT ASSUMPTIONS WERE YOU MAKING WHEN INTERPRETING THE SIGNALS? WHAT INFO DID YOU NEED TO DECODE THE SIGNALS?

1. A FLASHLIGHT TRULY HAS ONLY TWO STATES – ON AND OFF 1. A FLASHLIGHT TRULY HAS ONLY TWO STATES – ON AND OFF. A LOT OF YOUR DEVICES HAD MORE, LIKE A THIRD “DO NOTHING” STATE. 2. WHEN THERE ARE TWO STATES, TIME AND SUNCHRONIZATION BECOME HUGE FACTORS AND MUST BE ACCOUNTED FOR IN THE PROTOCOL.

PROTOCOL: SET OF RULES ABOUT SENDING, RECEIVING AND INTERPRRETING BINARY MESSAGES BIT: SHORT FOR BINARY DIGIT.

We will be using the Internet Simulator for this chapter We will be using the Internet Simulator for this chapter. Set up the Internet Simulator with a partner and watch the video on how to use it. Practice with your partner.

YOUR JOB WITH THE SIMULATOR IS TO EXPLORE THIS TOOL WITH A PARTNER YOUR JOB WITH THE SIMULATOR IS TO EXPLORE THIS TOOL WITH A PARTNER. CLICK ALL THE BUTTONS, TYPE IN THE TEXT AREAS. YOU CANNOT BREAK IT.

THERE IS A MYSTERY IN WHAT THE TOOL DOES AND DOESN’T DO THERE IS A MYSTERY IN WHAT THE TOOL DOES AND DOESN’T DO. CAN YOU FIGURE IT OUT? YOU AND YOUR PARTNER HAVE 5 MINUTES TO SEE WHAT YOU CAN FIND.

WHAT DID YOU FIND OUT?

WATCH INTERNET SIMULATOR – PART 1 – VIDEO THROUGH YOUR CODE.ORG

CHALLENGE FOR TODAY IS TO FIGURE OUT A WAY TO COORDINATE ACTIONS WITH YOUR PARNER TO MAKE THIS TOOL FUNCTION AS A TWO-WAY BIT-SENDING DEVICE.

ACTIVITY YOU NEED THE ACTIVITY GUIDE ACTIVITY YOU NEED THE ACTIVITY GUIDE. RULES: PAIRS DECIDE WHO GOES FIRST. THAT PARTNER WRITES A SECRET MESSAGE. THE OTHER PARTNER WRITES WHAT THEY RECEIVE. COMPARE. MAKE A MESSAGE AND SEND IT. FOLLOW THE GUIDE.

PUMP IT UP. DO THE MESSAGE BACKWARDS PUMP IT UP! DO THE MESSAGE BACKWARDS! INCREASE THE NUMBER OF BITS YOU HAVE TO SEND

WRAP UP WATCH VIDEO: THE INTERNET: WIRES, CABLES & WIFI FILL OUT THE VIDEO GUIDE AS YOU WATCH THROUGH YOUR ACCOUNT.

ASSESSMENT RESPOND TO THE QUESTIONS IN CODE STUDIO.

HOMEWORK READ ABOUT THE FOLLOWING KOANS (OR TRUTHS) OF BITS RELATED TO THE INTERNET IN CHAPTER 1, PAGES 4 – 13 TURN IN FOR CREDIT.