Week Assignments

• Week 1
• Week 2
• Week 3
• Week 4
• Week 5
• Week 6
• Week 7
• Week 8
• Week 9
• Week 10
• Week 11
• Week 12
• Week 13
• Week 14
• Week 15
• Week 16
• Week 17
• Week 18

Week 4 - Embedded Programming
Assignment:
* Browse through the datasheet for your microcontroller.
* Write a program for a microcontroller, and simulate its operation, to interact with local input/output devices and communicate with remote wired or wireless connections.
Extra credit:
* Test the program on the development board.
* Try different programming languages or development environments.
Group assignment:
* Demonstrate and compare the toolchains and development workflows for available embedded architectures.
* Document your work on the group page and reflect on your individual page what you learned.


Individual Assignment: ESP32 Development Board
The ESP32-DevKitC is a development board based on the ESP32 microcontroller, produced by Espressif. It is commonly used for IoT, embedded systems, and automation projects due to its robust features and wireless capabilities.
The ESP32 interfaces with wireless modules and is widely used in education, prototyping, and IoT projects.
Espressif ESP32-WROOM32
The Espressif ESP32-WROOM32 is a 32-bit microprocessor developed by Espressif Systems. It is widely used in embedded and IoT systems.
Specifications:
* Microcontroller: ESP32, dual-core 32-bit microprocessor (Tensilica Xtensa LX6), running at up to 240 MHz.
* Memory: 520 KB SRAM, with external flash storage options.
* Wireless Connectivity:
- WiFi: 802.11 b/g/n, 2.4 GHz with WPA/WPA2 security.
- Bluetooth: v4.2 BR/EDR and BLE (Bluetooth Low Energy).
* Power: Can be powered via USB or an external power source (3.3V or 5V).
* Operating Voltage: 3.3V logic level for GPIO.
* USB-to-Serial Converter: Typically uses CP2102 or CH340 for USB programming.
* I/O Interfaces: GPIO, PWM, ADC, DAC, SPI, I2C, I2S, UART, SDIO.
Datasheet:
Espressif ESP32-WROOM32 Datasheet



Wokwi:
Wokwi is an online simulation platform for designing, simulating, and testing electronics projects involving microcontrollers like Arduino, ESP32, and Raspberry Pi Pico. It allows for project creation and testing directly in the browser, making it ideal for prototyping, learning, and testing without physical hardware.
I used Wokwi to conduct 4 simulations.
1. ESP32 with OLED Display as an Output Device



Here is the code for the simulation.

#include 
#include 
#include 


#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

#define OLED_RESET    -1

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {

  Serial.begin(115200);


  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { 
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  

  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE); 
  display.setCursor(0, 10);
  display.println("Vanakkam ESP32!"); 
  display.display(); 


  delay(5000);
  display.clearDisplay();
  display.setCursor(0, 10);
  display.println("I'm Nandalal");
  display.display();
}

void loop() {
}
                                        

2. ESP32 With Switch as an Input
* It’s an LED OFF state.



* It’s an LED ON state.



Here is the code for the simulation.

const int switchPin = 13; 
const int ledPin = 2;  
int lastSwitchState = HIGH; 
bool ledState = LOW;        

void setup() {

  Serial.begin(115200);


  pinMode(switchPin, INPUT_PULLUP);


  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, ledState); 
}

void loop() {

  int switchState = digitalRead(switchPin);


  if (switchState != lastSwitchState) {
    lastSwitchState = switchState;


    if (switchState == LOW) {

      ledState = !ledState;
      digitalWrite(ledPin, ledState);

      if (ledState) {
        Serial.println("LED is ON");
      } else {
        Serial.println("LED is OFF");
      }

      delay(100);
    }
  }
}