WEEK 2- FRIDAY
- Aug 4, 2019
- 2 min read
Important for designers to speak the same language as programmers and developers.
Important points:
-5v red lead and blue lead connected to two positive and negative bases on bread board
-always comment your code
- {} () [] are all different
Pulse Width Modulation
~ = PWM - sending pulses to a light in waves
Coding
# define LEDPIN 9 (unchangeable) is a shortcut for 'int = LEDPin 9;'(changeable), it doesn't need a semi colon either
Difference between Digital and Analogue
Digital= high, low
Analogue= a 'wave form', 0 value and every value in between 5v, changing and multiple values
analogWrite = 8 bit,
digitalWrite= 10 bit,
Binary 101 (01101)
map(sensorValue, 0, 1023,0, 255) mapping the sensor value makes it dim more smoothly since the pre determined numbers are plugged in
Designing code: its all about choices
Basic sequence:
setup Input/Output -> start state -> wait for button (read button state, repeat) -> blink LEDs (switch on LED, switch off LED, repeat)
If, then, else:
If (value > testvalue) {
// code in here...
}
== means you're testing whether something is correct
Instead of a pulldown resistor for a button,you can use:
pinMode (pin, INPUT_PULLUP);
Button is HIGH until pressed when it becomes low
! = inverts the read
Boolean logic vs the tables of truth
AND && if variable 1 AND variable 2 are true
OR || if variable 1 OR variable 2 is true
NOT ! if variable is NOT true
Truth tables are useful: Mapping all the possible outcomes
Building complex statements: (4 Loops) 'Algebra'
eg. if (value >= 50 && (value<=100 || buttonX))
i.e. if value is bigger and doesn't equal 50, AND (value 2 is smaller than and doesn't equal 100 OR button x is pressed) something will happen...
The potentiometer was turned which relays values which are written on the screen.
The potentiometer was turned which turns the LED on gradually.
Both buttons were required to be pressed so that the LED could receive power.
A loop was created so that the LED would add a value through every loop and turn on and off repeatedly.
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