Articles about ESP32

ESP32 is a low-cost system on chip with integrated Wi-Fi and dual-mode Bluetooth created by Espressif Systems. Therefore, it is a popular SoC that is integrated on many microcontrollers boards.

On this page, you will find tutorials on how to use your ESP32 development boards.

How to setup MicroPython on your ESP32 development board to run Python applications

When my friend Youssef shared a link to MicroPython, I kept it at the back of my mind. Since I had found some time to sharpen my saw, I decided to take a look at it.

If I get familiar MicroPython, then I can perform machine learning magic with an AIOT board like Sipeed Maixduino Kit with greater ease.

Given that in mind, here are the steps that I took to setup MicroPython on my ESP32 development board to kickstart my learning.

In case you wish to setup MicroPython on your ESP32 development board to run Python applications, read on to find out more.

How to post JSON data to a HTTP server endpoint from your ESP32 development board with ArduinoJson

When sending data from your ESP32 development board, you may choose to send the data in JSON.

In such a situation, you can consider using ArduinoJson to help you construct the JSON data.

Given that, let us look at how we can post JSON data to a HTTP server endpoint from a ESP32 development board with ArduinoJson.

How to send a HTTP Basic Authentication request from your ESP32 development board

When you connect your ESP32 board to the internet, you may need to send HTTP Basic Authentication requests.

In this situation, we can rely on the HttpClient library from the Arduino core for ESP32.

Given that, this post shows how you can send a HTTP Basic Authentication request from your ESP32 development board.

How to control a servo motor with an ESP32 development board

When I try to reuse the Ardunio Sketch to control a servo motor with a ESP8266, I encountered the following error during compile time:

WARNING: library Servo claims to run on (avr, sam, samd, nrf52, stm32f4) architecture(s) and may be incompatible with your current board which runs on (esp32) architecture(s).
In file included from /Users/i309663/Documents/learning/Arduino-sketches/sketch_arduino_servo/sketch_arduino_servo.ino:1:0:
/Users/i309663/Arduino.1.8.7/Arduino.app/Contents/Java/libraries/Servo/src/Servo.h:73:2: error: #error “This library only supports boards with an AVR, SAM, SAMD, NRF52 or STM32F4 processor.”
#error “This library only supports boards with an AVR, SAM, SAMD, NRF52 or STM32F4 processor.”
^
exit status 1
Error compiling for board ESP32 Dev Module.

Therefore, I had to find another way to control my SG90 servo motor with an ESP32 development board.

Given that, this post shows how to control a servo motor with an ESP32 development board.

ESP32 devkit-c v4 connected to sg90 servo motor

How to use an ESP32 development board to read from a VCNL4010 Proximity/Light sensor

If you have a Proximity/Light sensor, you will be able to detect how close an object is. When your range of detection is within 200mm, you can use the VCNL4010 Proximity/Light sensor.

Given that characteristic, you can use the VCNL4010 Proximity/Light sensor as a contactless switch to trigger some action.

For example, you can use it in a soap dispenser that will dispense some soap when a palm is near the nozzle.

In case you need it, this is how to use an ESP32 development board to read from a VCNL4010 Proximity/Light sensor.

VCNL4010 Proximity/Light sensor

How to use an ESP32 development board to read RFID tags from a SparkFun RFID USB Reader

When you have an RFID starter kit from Sparkfun, you will be able to read RFID tags through a serial connection.

Although the SparkFun RFID USB Reader comes with a USB port, you can also read RFID tags with an ESP32 development board.

In case you need it, this is how to use an ESP32 development board to read RFID tags from a SparkFun RFID USB Reader.

SparkFun RFID USB Reader

How to write a C# program to communicate with an ESP32 development board via Bluetooth Serial

Coupled with Bluetooth Serial and GPIO pins, ESP32 can augment a Windows machine with the ability to read from sensors.

So with an ESP32 development board, you can turn your old Windows machine into an IOT gateway that can sense its operating environment.

Given these points, let us look at how we can write a C# program to communicate with an ESP32 development board via Bluetooth Serial.

How to connect to an ESP32 development board via Bluetooth on your Mac

When you are trying to build a ESP32 project that uses Bluetooth to receive from or send data to another device on Mac, you may want to use your Mac to connect to your ESP32 board to test Bluetooth connectivity.

In this case, you will need to first connect your Mac with the ESP32 development board via Bluetooth.

So how can you do that?

In case you need it, this is how to connect to an ESP32 development board via Bluetooth on your Mac.