Why ESP32 & ESP8266 for IoT
Built-in WiFi, more power, same Arduino code.
Why ESP32 & ESP8266 for IoT is a free Arduino & IoT Academy lesson on CoddyKit — lesson 1 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Arduino & IoT Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
The Missing Piece
A plain Arduino Uno has no way to reach the internet. For real IoT, you need a board with built-in WiFi, and that is where the ESP family shines. 📡
Meet the ESP8266
The ESP8266 is a tiny, cheap chip with WiFi baked right in. It made low-cost internet projects possible for hobbyists everywhere.
Meet the ESP32
The ESP32 is its bigger sibling: faster, dual-core, and it adds Bluetooth alongside WiFi. It is the go-to board for serious IoT today.
Same Language You Know
Here is the best part: both boards run the same Arduino code style you have already learned. setup() and loop() work exactly as before.
void setup() {
Serial.begin(115200);
}
void loop() {
}More Power Under the Hood
An ESP32 runs at up to 240 MHz with far more memory than an Uno. That headroom lets it juggle WiFi and your sensors at once.
Watch the Voltage
One key difference: ESP pins run on 3.3V, not 5V. Feeding them 5V can fry the chip, so check every sensor's voltage first.
Faster Serial Speed
ESP boards usually open Serial at 115200 baud, not 9600. It keeps up with the chatty WiFi boot messages they print at startup.
Serial.begin(115200);Lots of Pins, Some Special
The ESP32 offers many GPIO pins, but a few are reserved or input-only. You learn which ones are safe as you build.
The WiFi Library
To go online you include the built-in WiFi library. One header line unlocks connecting, scanning, and serving web pages.
#include <WiFi.h>Cheap Enough to Deploy
These boards cost just a few dollars, so you can scatter many around a home or farm. Low price is a huge reason the ESP dominates IoT.
Which One to Pick
Need only WiFi on a tight budget? The ESP8266 is fine. Want Bluetooth, more pins, and speed? Reach for the ESP32.
Quick Check
You want a board for IoT that also speaks Bluetooth. Which fits best?
Recap
You met the WiFi-ready ESP boards, saw they run familiar Arduino code on 3.3V, and learned the ESP32 adds Bluetooth and power. 🎉
Frequently asked questions
Is the “Why ESP32 & ESP8266 for IoT” lesson free?
Yes — the full text of “Why ESP32 & ESP8266 for IoT” is free to read here on the web, and the Arduino & IoT Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Arduino & IoT Academy course, upgrade to CoddyKit PRO.
What will I learn in “Why ESP32 & ESP8266 for IoT”?
Built-in WiFi, more power, same Arduino code. You practise Arduino & IoT Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Arduino & IoT Academy?
No prior experience is required. Arduino & IoT Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 1 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “Why ESP32 & ESP8266 for IoT” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Arduino & IoT Academy lesson?
Yes. Every Arduino & IoT Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- Why ESP32 & ESP8266 for IoT
- Add ESP Boards to the IDE
- Connect to WiFi in Station Mode
- Run an Access Point Setup Page