Continuing with LED’s and Arduino

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Presentation transcript:

Continuing with LED’s and Arduino A Microcontroller

Exploring concepts – trouble shooting Check it is plugged in, powered on (connected) and the board type and com port has been set Blink test – confirms all is good (pin on the PCB will blink, if the LED doesn’t => faulty LED) LED pins in the right way around? Then check your physical connections Make sure components aren’t touching each other and creating short circuits (this often happens with the resistors) Still not working? Get a working blink test with a resistor and LED – then swap connectors to test them

Exercise 13 - Multiple LED’s with chase effect <File>, <Examples>, <SIK_Guide_Code_32>, <Circuit_04>

Notes on the code An array lets you store a group of variables (int ledPins[] = {2,3,4,5,6,7,8,9};) creating an index. The index count starts at zero (this is is an index from 0 to 7) We're using the values in this array to specify the pin numbers that the eight LEDs are connected to. LED 0 is connected to pin 2, LED 1 is connected to pin 3, etc. Every for() loop has three statements separated by semicolons (;): Something to do before starting A test to perform; as long as it's true, keep looping Something to do after each loop (increase a variable)

Notes on the code So start at index = 0, add one each loop, when it reaches 8 (as we have 7 in our index) proceed with the next block of code index++ - after a variable means "add one to it". for(index = 0; index <= 7; index++) – go up through the LED’s turning on for(index = 7; index >= 0; index--) – go down through the LED’s turning off

Exercise 14 - Interactive LED Chase effect Add a Pot Where do the LED’s draw power from? Why the digital GND rather than the analog GND? The Pot is a variable resistor, what is it doing here?