4. EMBEDDED PROGRAMMING

For this week, our global and local teachers asked us to research microcontrollers, their advantages and disadvantages by comparing them using the microcontrollers' datasheets. Then we must write a program for the chosen microcontroller and simulate its operation to interact (input and output); as well as communicate (remote wired or wireless).

- MCU´S -

After reviewing the microcontrollers' datasheets, I narrowed it down to 3 options; I will give you some points from the datasheets of these 3, and I will tell you the advantages and disadvantages of each of them, and which one I considered to be the best option to then create a program with this week's requirements.

After searching different sites, I was able to decide which is the best option for the project. I had to take into account some considerations that are necessary to complete the project. The specifications I took most into account to make a decision were the following:

- NECESSARY´s SPECIFICATIONS -

• 0. FOR LOCKER CONTROL
• - PWM:
  • A channel per servo of the locker
• - GPIO :
  • 2 pins for servo (signal and power)
  • Extra pins for door sensors
  • Status indicator LED´s

• 01. FOR VOICE RECOGNITION
• - CPU:
  • Voice pattern processing needs high speed
  • Compare voice with stored patterns in real time
• - Storage:
  • Needs a good storage size

• 02. FOR USERS INTERFACE
• - I2C (SDA, SLC):
  • Show system status
  • Acces indicators
• - Additional pins:
  • Presence senso
  • Compare voice with stored patterns in real time

• 03. CONNECTIVITY
• - Wifi/Bluetooth for:
  • Control app
  • Access logs

• 04. FUTURE EXPANSIONS
• - Free pins for:
  • Biometric sensors
  • Backup keypad
• - Additional RAM for :
  • More users
  • New functions

In summary, the best option for the locker project is the ESP32-WROOM microcontroller. That's why this week I created this program simulating an exercise with the microcontroller that I consider is the best option for my final project. This code is in C++ language - it turns on an LED with a button and I can change its brightness using the potentiometer. This code meets the requirements for the week. I'm including the video of how it works, along with its code