Blink test using ESP32 NodeMCU

External & Internal LED blink test Code Uploads via Arduinodroid Android app

Table of Content:

1. prerequirement

2. Internal LED blink test

3. External LED blink test

4. Summary

1. prerequirement:

Before diving into the exciting process of uploading code to your ESP32 using your Android phone, ensure you have the following:

• ESP32 NodeMCU
• LED light
• USB Cable: To connect ESP32 to device
• Arduinodroid (guide)/Arduino IDE

2. Internal LED blink test:

Internal LED blink code:

#define ONBOARD_LED  2 // internal LED pin

void setup() {
  pinMode(ONBOARD_LED,OUTPUT);
}

void loop() {
  delay(1000);
  digitalWrite(ONBOARD_LED,HIGH);
  delay(100);
  digitalWrite(ONBOARD_LED,LOW);
}

• For ArduinoDroid use, refer here
• Upload code in IDE and compile it
• Now connect ESP32 NodeMCU to your device
• Upload code on ESP32

3. External LED blink test:

Connection diagram for ESP32 & LED:

ESP32 Connection diagram

Note: Make sure to connect led negative(-) to esp32 gnd(ground) and use register accordingly (without register, it will also work fine but not recommended)

External LED blink code:

#define ONBOARD_LED  19 // external LED pin

void setup() {
  pinMode(ONBOARD_LED,OUTPUT);
}

void loop() {
  delay(1000);
  digitalWrite(ONBOARD_LED,HIGH);
  delay(100);
  digitalWrite(ONBOARD_LED,LOW);
}

• For ArduinoDroid use, refer here
• Upload code in IDE and compile it
• Now connect ESP32 NodeMCU to your device
• Upload code on ESP32

4. Summary:

You can experiment with code by changing time delay, pattern on turning light on/off, by adding more color light and more.

There’s nothing limited, Just think and try it.

Happy Coding!