Group Assignment

Embedded programming

Objectives of the week

Group assignment

Compare the performance and development workflows for other architectures

As per the task of group assignments for this week we have distribute the task to individual one which they didnt tried before.

Task Assign:

Vikram-Python GUI – tkinter

Snehal-Study and test the performance of ESP-32 and family architecture

Tejaswini-Compare the performance of family architecture like Atmega 328p,Rasberri-pi,Xtensa family ESP-32

Comparing family different family architecture:

Sr No.	Parametres	Atmega328p	ESP 32	Rasberry pi 3
1.	Operating Voltage	5V	3.3V	3.3V
2.	DC current on I/O pins	40mA	40mA	16mA
3.	Digital I/O pins	14	39	26
4.	Flash Memory	32KB	4MB	16 Gbytes SSD memory card
5.	Frequency	16MHz	40MHz	1.2GHz
6.	Wi-Fi	-	802.11b/g/n	802.11b/g/n
7.	Bluetooth	-	V4.2	V4.1
8.	Microcontroller	ATmega328p	Xtensa LX6	Broadcom BCM2837 64bit quad core processor
9.	Architecture	Harvard	Harvard	Harvard

Specifications of ESP32:

The ESP32 is dual core, this means it has 2 processors.

It has Wi-Fi and bluetooth built-in.

It runs 32 bit programs.

The clock frequency can go up to 240MHz and it has a 512 kB RAM.

This particular board has 30 or 36 pins, 15 in each row.

It also has wide variety of peripherals available, like: capacitive touch, ADCs, DACs, UART, SPI, I2C and much more.

It comes with built-in hall effect sensor and built-in temperature sensor.

As we have mentioned the features of ESP-32 in above comparision table now here we are going to see the performance of ESP-32 of xtensa family.Actually to test the esp-32 is new to all.But few of the group members wanted to learn and test the ESP-32.So in below video we have shown the blinking LED program in ESP-32.

ESP32 is a series of low-cost, low-power system on a chip microcontrollers with integrated Wi-Fi and dual-mode Bluetooth. The ESP32 series employs a Tensilica Xtensa LX6 microprocessor in both dual-core and single-core variations and includes built-in antenna switches, RF balun, power amplifier, low-noise receive amplifier, filters, and power-management modules. ESP32 is created and developed by Espressif Systems, a Shanghai-based Chinese company, and is manufactured by TSMC using their 40 nm process.

ESP 32 pinout:

Programming Environment:

The ESP32 can be programmed in different programming environments. You can use:

Arduino IDE

Espressif IDF (IoT Development Framework)

Micropython

JavaScript

As we are familiar with arduino IDE ,we are using Arduino platform for ESP32 programming.There’s an add-on for the Arduino IDE allows you to program the ESP32 using the Arduino IDE and its programming language.

Copy the URL from github for ESP32 adding in Arduino.Go to Arduino-->File-->preferences and paste your URL.

Open Boards Manager from Tools > Board menu and install esp32 platform

Plug your ESP32 development board to your computer and follow these next instructions:

Go to tools--> Board and select your ESP32 board and also select COM port.

After doing all this ,write your code in arduino and upload it in ESP32 board.As we are doing only LED blinking code.We have written code for it.First compile your code and then upload it.

If you get the following error when trying to upload code, it means that your ESP32 is not in flashing/uploading mode.Failed to connect to ESP32: Timed out... Connecting...To upload code, you need to follow the next steps (make sure you have the right board selected:

Hold-down the “BOOT” button in your ESP32 board

After you see the “Connecting….” message in your Arduino IDE, release the finger from the “BOOT” button:

After that, you should see the “Done uploading” message.

That’s it. After uploading the new sketch, you can press the “ENABLE” button to restart the ESP32 and run the new uploaded sketch.

Python GUI – tkinter

Python offers multiple options for developing GUI (Graphical User Interface). Out of all the GUI methods, tkinter is the most commonly used method. It is a standard Python interface to the Tk GUI toolkit shipped with Python.

To create a tkinter app:

Importing the module – tkinter

Create the main window (container)

Add any number of widgets to the main window

Apply the event Trigger on the widgets.

There are two main methods used which the user needs to remember while creating the Python application with GUI.

Tk(screenName=None, baseName=None, className=’Tk’, useTk=1):
To create a main window, tkinter offers a method ‘Tk(screenName=None, baseName=None, className=’Tk’, useTk=1)’. To change the name of the window, you can change the className to the desired one. The basic code used to create the main window of the application is:

m=tkinter.Tk() where m is the name of the main window object

mainloop(): There is a method known by the name mainloop() is used when your application is ready to run. mainloop() is an infinite loop used to run the application, wait for an event to occur and process the event as long as the window is not closed.

m.mainloop()

There are a number of widgets which you can put in your tkinter application. Some of the major widgets are explained below:

Button:To add a button in your application, this widget is used.The general syntax is:

w=Button(master, option=value)

CheckButton: To select any number of options by displaying a number of options to a user as toggle buttons. The general syntax is:

w = CheckButton(master, option=value)

Entry:It is used to input the single line text entry from the user.. For multi-line text input, Text widget is used. The general syntax is:

w=Entry(master, option=value)

Frame: It acts as a container to hold the widgets. It is used for grouping and organizing the widgets. The general syntax is:

w = Frame(master, option=value) master is the parameter used to represent the parent window.