1. Introduction
Let 's start with LED blinky example, it is equivalent to “Hello World”. We use Arduino ESP32 to blink the LED on/off every 1 second. You can also extend it with a Relay module (as a ON/OFF switch) that can control ON/OFF a high power electric devices such as electric motor, bulb, ... by using a small electric signal from micro controller.
Let 's start with LED blinky example, it is equivalent to “Hello World”. We use Arduino ESP32 to blink the LED on/off every 1 second. You can also extend it with a Relay module (as a ON/OFF switch) that can control ON/OFF a high power electric devices such as electric motor, bulb, ... by using a small electric signal from micro controller.
Figure: Relay module with IN1, IN2 is small input signal from
MCU and the opposite side for high power devices
For Blinky demo, just connect:
[ESP3 IO14 and ESP3 GND to LED]
Figure: ESP32 connect to LED
For extension demo, connect:
[ESP32 IO18 - Relay IN1]
[ESP32 GND - Relay GND]
Figure: ESP32 connect to Relay module
3. Software
If you
are familiar with Arduino you see that it is very easy. First we use
pinMode() function to
set the pin IO14 as OUTPUT.
Then we set the HIGH level for pin IO14 by using digitalWrite()
function. We need a little
delay so that we can
monitor the LED is ON or OFF.
Select your board in > Tools > Board > ESP32 Dev Module
Select Upload Speed in > Tools > Upload Speed > 115200
Select Flash Frequency in > Tools > Flash Frequency > 80MHz
Select the COM port that the board is attached to in > Tools > Port
Then Compile and Flash SW to ESP32
Figure: Press red button to compile and flash SW to ESSP32
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