Week 7

This week’s assignment was to Design and program a smart device that perform a certain function or solve a problem, with more than one input and more than one output.

so i thought of making a smart hand sanitizer spray

*when detect someone crossing by "ultrasonic Sensor"

* plays sound "to take attention" "Buzzer"

* a red led will blink too

* "a poster shows you " to get your hands close to a spray bottle

* an "IR proximity sensor" will detect your hands

*a servo trigger a motion to spray a sanitizer on your hand

* a green led will blink

i used mainly Arduino IDE for coding it uses C language which they say the easiest "eye rolling", i still get confused trying to write any thing with it

the Arduino process the code in parts :

• First part defining used library's and used variables and pins numbers.

• Second part is Void Setup the code included in this runes one time only.

here also you setup pin Mode on the Arduino for OUTPUT "action component" like a buzzer or a servo or even leds .... "digitalWrite ( pin number , HIGH/LOW) / analogWrite ( pin number , value from 0 to 1023)"

or INPUT like sensors and potentiometers and so on. " digitalRead(pin number) / analogRead(pin number) "

also if you want to rune any thing like resetting a servo position somthing that will play once at the beginning of the code

• Third part:

Void loop its the part of the code where you want it to loop and repeat itself

until stopped by something in the code itself otherwise it will loop for ever.

here you can use conditions to update a variable to do action or to calculate more than one actions .

You can also creat a function outside the void loop and call it to execute from the Void loop itself.

don't forget the semicolon and the brackets,

used components

• Arduino Uno
• 2 leds red & green
• 2 resistors 330 ohm
• ultrasonic sensor
• IR proximity sensor
• a servo
• a buzzer
• a breadboard
• and lots of wires "male to male headers "& "male to a female headers "

i drew a simple circuit diagram on paper first for the wiring

1. the code starts with defining servo library and used pins
2. setting up outputs and inputs in the void setup
3. in the void loop the code starts with sending signal through ultrasonic's trigger_pin and then reading it back from echo_pin after that it calculate distance from the time it took from sending until receiving

im just glade that it work :D