Code Along - Chapter 20

ESP32: First Sketch

Start Serial at the ESP32 speed of 115200 and blink the LED on GPIO 2.

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ESP32 code on the virtual board

The virtual board is an Uno, not an ESP32, so there is no Wi-Fi here. You practise the code around it. A pot reading is a pretend number in a variable, like int reading = 2048;. The LED on GPIO 2 works the same; the test list calls it pin D2.

Exercise 20.1

Hello at the ESP32 speed

Not started

ESP32 sketches start Serial at 115200, not 9600. Change the speed, then print Hello ESP32.

Sample output

Hello ESP32

void setup() {
  Serial.begin(9600);        // change 9600 to the ESP32 speed
  // Print: Hello ESP32

}

void loop() {
}

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Exercise 20.2

Blink the LED on GPIO 2

Not started

The LED is on GPIO 2. Make it blink: half a second on, half a second off. Add four lines in loop().

const int ledPin = 2;         // the LED is on GPIO 2

void setup() {
  pinMode(ledPin, OUTPUT);    // the LED pin is an output
}

void loop() {
  // On, wait 500 ms, off, wait 500 ms

}

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