Week 7  Journal

This week’s assignment was to design and program a smart device that performs a certain function.

I chose to make smart Toll Tax System because I watched a video about it, I liked the idea, and decided to simulate it

Electric Components:

• breadboard, jumpers to connect the component

• 2 ultrasonic Sensor  &servo motor & Buzzer 

• Arduino Uno to read the input signals from the 2 ultrasonic Sensor & accordingly, control the rotation of servo motor and sound from buzzer 

other Components:

• cardboard 

• plastic 

• glue 

Inputs

Ultrasonic  sensor: sense distance of an object 

Action

The servo motor rotates 90 degree angle for 3 seconds and then get back to start point . 

Buzzer produces sound 

Brain

An Arduino UNO board will be used take inputs and generate actions

Code Screens

1. Identify trigger pin 1 (3) and echo pin1 (2)

2. Identify the servo as "Servo lock" and its initial position is the angle (90).

3. Identify trigger pin 2 (4 and echo pin2 (5)

4. Set the output pins(7) for buzzer  and pin (9) for servo.

5. I used If Function

6. The first if function:

   1. If: Read ultrasonic distance less than 20cm --> then the buzzer pins read High (produces sound ).

7. The other if function:

   1. If: Read ultrasonic distance less than 20cm -->Then the servo angle goes (0) --> pull the gate and open it.

   2. If:other than Read ultrasonic distance less than 20cm--> Then the servo angle goes (90) --> closes it back 

8. Then uploaded the code to the Arduino IDE.

Uploading text code on Arduino

• The Arduino board was connected to the laptop and the right port was chosen "Tools ==> Port ==> COM5 Arduino UNO"

• Then, It was uploaded successfully

Building the physical circuit

• The breadboard, Jumpers, ultrasonic Sensor , Servo Motor, buzzer & ِArduino UNO were taken from the electronic kit

• The circuit was built physically (exactly as it was designed on Tinkercad) using the hardware components and wires

  •  breadboard was connected to the  5V for Arduino (5V as some were needed for servo motor and ultrasonic  and buzzer  sensor ) represented by red wire 

  • Trig pin of first ultrasonic sensor was connected to pin 3 

  • Echo pin of first ultrasonic sensor was connected to pin 2 

  • Trig pin of second ultrasonic sensor was connected to pin 4 

  • Echo pin of second ultrasonic sensor was connected to pin 5 

  • Pin for buzzer was connected to pin 7 

  • Pin for servo motor was connected to pin 9 

 I struggled  alot with coding of the ultraosnic sensor 

I seached alot all of the over google for a suitable code but most of them didnt work till i found a code and i started adding and twinking it to my understanding 

one of the mistakes that i did was not connecting the echo pin and trigger pin to the correct pin done in the code , so it took me a while to figure this mistake out 

another one was with the buzzer , i switched the positions of the +ve and -ve wiring.

also the mounting without the use of glue took a lot of imagination at the end i used something similar to nail 

text coding is the skill i acquired this week , so hard but i think it will be so beneficial on the long run