One of the most popular projects among the ones included in my tutorial about the enc28j60 chip is fore sure WebRelay. This project allows to control an output pin of Arduino using a simple web page, designed to be accessed also using your smartphone. Today I’m going to show you how to implement a similar project with the…
On this site I’ve already posted about the CH340G chip, manufactured by a chinese company and often adopted as a cheap solution when a USB -> serial converter is needed. As the chip package (SOP16) is quite easy to solder, I ordered some ICs from AliExpress and I designed a minimal demoboard, based on the reference schematics: You can download Eagle files (both schematics…
Today we start building the chassis kit from Banggood that will become the robotic platform we’ll play with in the next posts… But first, remove the protective paper from all the acrylic parts: Let’s mount the motor on the chassis. You need the motor, two screws with their nuts, two mounting plates and the plastic wheel for the encoder. Insert the wheel…
In today’s tutorial you’ll learn how to permanently store information, so that they are preserved even if the esp32 chip is reset or power is removed. NVS NVS (Non Volatile Storage) is a library included in the esp-idf framework that allows to store information (in the form of key/value) in the flash memory, the content of which is not erased…
In all the examples so far, we used the esp32 chip in STAtion Mode, that is as a client which connects to an existing wifi network. In a previous article I explained in details how the different components of the esp-idf framework interact to establish the connection and how to use events to syncronize the tasks of your program. Today…
In embedded applications it’s often necessary a clock, as accurate as possible. For example, imagine a device that has to activate an output at a given time or a logger that has to store values (temperature…) at precise intervals. A solution widely adopted is the use of an RTC (Real Time Clock) chip. The problem…
After having published my tutorial about sending SMS with the ESP32, I received some comments via the contact form of my website asking a way to send notifications for free. Today I’ll show you a way to do it; it will be also the occasion to write about IFTTT service and about developing custom components for the…
When you surf on the Internet, the DNS (Domain Name System) service has the job of “translating” (resolve) the hostnames to the corresponding IP addresses. If, for example, you type www.google.com in your favorite browser, your computer queries the DNS server – usually the one managed by your provider – and gets from it the IP…
Pi Zero is a small board – part of the Raspberry family – designed for embedded applications where space is a constraint. The low cost (about 10€ for version W, with wifi connectivity) and the ability to run different operating systems makes it the ideal choice for different applications (media centers, data loggers…). Raspberry Pi Zero unfortunately doesn’t offer a dedicated audio…
On 6th of April, Espressif published version 2.0 of the esp-idf framework. The complete list of the new features and the bugs fixed is available on Github, let’s see the most important ones (in my opinion ;)): [checklist] they included or made stable new drivers for peripherals like I2C, I2S, SPI Master, SDMMC you can now run a serial…