ESP

ESP8266 and ESP32 is a series of low-cost, low-power system-on-chip microcontrollers with integrated Wi-Fi and dual-mode Bluetooth.

created and developed by Espressif Systems, a Shanghai-based Chinese company ESP32

Feature List of the board

  • Good processor! (240 MHZ)
  • Enough memory!! (520 KB but context)
  • Wifi + Bluetooth
  • Base feature set - Secureboot, Standard Security features, Cryptographic hardware accelerations, Power management!!!!!

Programming/Interfacing

We have a few options here now. As mentioned, The ESP community has a thriving ecosystem of developers!

  • Arduino IDE
  • ESP Easy
  • Official Espressif Development Frameworks - They also have one dedicated for Mesh Systems
  • Esprunio
  • Mongoose OS
  • Lua
  • RToS
  • MicroPython

Then we also have a bunch of tools that were created in this ecosystem.

  • PlatformIO

Small intro to firmware

Brief description about by taking Arduino Stack as an example

Code that we write -> Building - > Firmware Bootloader + Firmware - Goes to chip

A good rule of thumb to categorize something as firmware: is it part of the layer, which also provides API for interacting with GPIO ports

In the basic ino files we observe, the breakdown is something like: The parts

  • Arduino IDE - The building and uploading tool used
  • Arduino C - The language used for logic building
  • Arduino Framework - The OS/Firmware type

Time to choose

Choice of ecosystems:

  • Standard Arduino Stack

  • Arduino Framework with C++ We structure our code better. Instead of using Arduino’s version of C. we take more control of the running logic. Note here that the underlying framework is Arduino.

  • MicroPython MicroPython is a vibrant community of enthusiasts that have to build this implementation of CPython Specs, tailored for these class of Processors Python on device Micropython

  • Esprunio JS on device Esprunio

Choose your Board

  • ESP8266
  • ESP32
  • ARM based
  • Framework native boards - PyBoard, Pixl.js, etc

OTA

  • We can wrap the entire “sketch” inside an OTA version management system so to say.
  • Each device is subbed to unique channel to listen for OTA installation instructions. ideally maintained using the UID of the device.
  • Compiled Byte code hosted on shared services like S3.

Good reads on ESP32

  • https://www.exploreembedded.com/wiki/Overview_of_ESP32_features._What_do_they_practically_mean%3F