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Electronics design

This week’s group assignment is to use the test equipment in your lab to observe the operation of a microcontroller circuit board.

For this week a commercial micro-controller has been used for testing which is Arduino uni. The components and equipment used for testing are:

1- Breadboard

2- LED

3- Multimeter


The multimeter and oscilloscpe are laboratory instruments that used for testing preforamnce of desiged circuits, debugging errors and analysis. In this week, the multimeter was used to measure the output voltage of the LED when it get supplied by the 5 volt pin from Ardunio. The LED was connecting with a resistor for limiting the current. The oscilloscope was used to visuilize and analyze the waveform of electronic signal from the LED.


we connected the LED with 1k ohm resistor with the intel genuino 101 GND and port 9


We connected the multimeter in parallel to the LED with the resistor

We measured the voltage change wich was 0-3v because the board operating voltage is 3v


We connected the Oscilliscope in parallel to the LED with the resistor

NOTE that the oscilscope has two terminals the long stick is the positive and the crocodile clamp in the negative


According to gwinstek

50/70/100MHz bandwidth selections, 2ch or 4ch input

1GSa/s maximum sampling rate

10M maximum memory depth for each channel

7” 800 x 480 WVGA LCD display

256 color gradient display function to strengthen waveform performance

1Mpts FFT frequency domain signal display

Zero Key function for horizontal time, vertical voltage and triggering

Compact and innovative exterior design

Fade “PWM”

AS we can see the pulse duration is changing with time wich wiil allow our eyes to see the fading effect


void setup() {
  pinMode(9, OUTPUT);

void loop() {
  digitalWrite(9, HIGH);   
  digitalWrite(9, LOW);  


NOTE we used pin 9 beacause it can produce PWM

int LED = 9; // LED pin
int brightness = 0; // how bright the LED is
int FadingLED = 4; // how many points to fade the LED by

void setup() {

pinMode(LED, OUTPUT); // set LED as an output


void loop() {

analogWrite(LED, brightness);

brightness = brightness + FadingLED;

if (brightness == 0 || brightness == 255) {
FadingLED = -FadingLED ;

delay(50); // delay 50 milliseconds.