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If you read my post ESP32, Wemos or not to Wemos you know that I brought a development board, that happened to be a D-duino-32 clone, with an ESP-WROOM-32 module and a 0.96″ oled display. This display, available also as a standalone module on several websites (for example on Banggood), has the following features: [checklist] size: 0.96 inches resolution: 128×64 pixels controller: SSD1306 with I2C interface power supply: 3.3V – 6V…
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The security of several protocols is implemented using SSL certificates. Usually, those certificates are created by public certificate authorities. If we’re connecting to a website (HTTPS protocol), the browser we’re using must recognize the identity of the CA that signed the server certificate, otherwise an error message is shown: A CA “creates” a new certificate signing it…
In my previous tutorial I explained how to use the I2C driver included in the esp-idf framework to communicate with I2C devices. Today I’ll show you a pratical example: the use of a temperature/humidity sensor. The sensor For this tutorial I chose the HTU21D sensor by Te Connectivity. This sensor offers a good level of accuracy and…
In today’s tutorial I’ll explain you how to interface the esp32 chip to external devices (sensors, displays…) using a very widespread bus: the I2C bus. I2C I2C (pronounced i-squared-c) is a serial communication bus – invented by Philips in 1982 – that allows two or more devices to communicate. The devices connected to the bus can…
In some of the previous tutorials, I explained how to include “external” items (images, SSL certificates…) in your program thanks to the embedding binary data feature of the esp framework. Today I’ll show you how to use part of the flash memory to store data, like it was an hard drive or a memory card. Partitions and filesystem You’ve…
In addition to the love for electronics, in my (little) spare time I’m working with my friend Davide on a model railway in H0 scale; in particular my main task is to take care of the digital control of locos, turnouts and accessories. The de facto standard to digitally control a model railway is named DCC (Digital Command Control);…
In this tutorial, divided in two posts, I’ll show you how to use RFID (Radio-frequency Identification) tags with Arduino. In the first part you’ll learn how to connect the reader to your Arduino and how to write a simple sketch to display the tag’s ID, while in the second part you’ll learn how to build a complete access control…