Week 6 - Journal

when I go to the dentist , I like the LED Sensor Light in the dental chair , when the doctor move his hand in front of light , the light switch on , so I want to use ultra sonic sensor and led and try this idea .

website : https://www.tinkercad.com/

Software: Arduino IDE

1 resistor 220 ohm

Arduino

Breadboard

Ultrasonic Sensor

Jumper Wires (Male - Male)

Led

First , I make the circuit on Tinker Cad , connect the ultrasonic sensor , led , resistor on breadboard , then connect the breadboard with Arduino with two Jumpers , one for ground and the other for 5V , connect the ultrasonic to the Arduino by four Jumpers , GND connect to the ground in breadboard , ECHO connect to pin 2 in Arduino , TRIG connect to pin 3 in Arduino

connect resistor to pin 7 in Arduino , put Jumper to connect the cathode of led to the ground on breadboard .

Then I make the code blocks in Tinker Cad , I add "Sensor value" block in Variables , form Input icon , choose "read ultrasonic distance on trigger pin " block , from output icons I choose "print to serial monitor " block to see the numbers of distance in Arduino , after that I put "if else" block form control icon , put sensor value block inside it , and choose block from Math icon to put the distance on it that will make the lamp on and off , put two blocks from output " set pin 7 to high else set pin 7 to low .

After I make the circut on Tinker cad ,

the link of circuit on tinker cad

https://www.tinkercad.com/things/hnsY4bGPlOz-glorious-bigery/editel?sharecode=EG4O52mjTkC6FY0FBJD0CADp_BbUdAlwJxS55-ZcLfM

I started to make the real circuit with components , connect the bread board with Arduino and led , ultrasonic exactly like the tinker cad circuit with same pins number and jumpers .

Then I take a copy of text on tinker cad , put it in Arduino IDE program , connect the Arduino to the computer and upload the code to it .

the code :

// C++ code

//

int SensorValue = 0;

long readUltrasonicDistance(int triggerPin, int echoPin)

{

pinMode(triggerPin, OUTPUT); // Clear the trigger

digitalWrite(triggerPin, LOW);

delayMicroseconds(2);

// Sets the trigger pin to HIGH state for 10 microseconds

digitalWrite(triggerPin, HIGH);

delayMicroseconds(10);

digitalWrite(triggerPin, LOW);

pinMode(echoPin, INPUT);

// Reads the echo pin, and returns the sound wave travel time in microseconds

return pulseIn(echoPin, HIGH);

}

void setup()

{

Serial.begin(9600);

pinMode(7, OUTPUT);

}

void loop()

{

SensorValue = 0.01723 * readUltrasonicDistance(3, 2);

Serial.println(SensorValue);

if (SensorValue >= 50) {

digitalWrite(7, HIGH);

} else {

digitalWrite(7, LOW);

}

delay(10); // Delay a little bit to improve simulation performance

}

When I upload the code to Arduino , it is not work , and appear massage , i can't understand it . so I ask help from Amani , she revise all the code then she discovered that I choose Arduino nano instead of Arduino uno , so we fix it and it uploaded successfully.

First Idea I made for this week was three led light , feel the temperature by LM35 sensor and similar to my final project, but I found the sensor has weird problem that the serial monitor appear negative degree of temperature numbers , so I try to solve the problem to avoid this numbers in final project , because of limited time , the instructors adviced me to work on another idea , I make ultrasonic Idea while we solve the problem with the final project .

Lear how to control an LED using a Digital Output Signal , and make it by myself.

Aya and me build smart waving Hand using Arduino , and it is really cool and funny .