In my previous article I explained the Bluetooth Low Energy technology and the advertising process. You learned that a BLE device can leverage the advertising packets to send data; in this case the device is called broadcaster and the devices which receive data are called observers. The payload of an advertising packet has the following structure: ADV ADDR is the device MAC address (this is the…
In my previous tutorials you learned how to use the wifi interface of the esp32 chip. Starting from this post, I’m going to explain you the second wireless technology the esp32 chip supports: bluetooth. In particular, my tutorial will be about Bluetooth Low Energy (BLE), sometimes called also Bluetooth 4.0 or Bluetooth Smart: Bluetooth Low Energy BLE is a technology…
One of the most frequent questions I receive from my website’s contact form or from my Facebook page is whether it’s possible to publish an HTTP server when the esp32 chip is working in SoftAP mode, that is when it publishes its own wifi network. In previous tutorials (18 – Access Point and 20 – Webserver) I’ve already blogged about the…
One of the major concerns for embedded devices is the power consumption. If the device you’re designing will be battery powered, it’s indeed important to reduce as much as possible its power consumption to maximize the autonomy (= the working time before it’s necessary to replace or recharge the battery). The esp32 chip offers 5 different power…
Today’s project, ESP32lights, is a smart device based on the esp32 chip. Thanks to ESP32lights you can turn a load on and off (I used it for my christmas lights) [checklist] manually based on daily schedules based on the light intensity [/checklist] ESP32lights connects to your wifi network, can be configured and operated via a…
Security is a very important aspect for MQTT brokers. In a previous article you’ve already learned how to implement authentication and authorization. The weakness in that configuration was that credentials were transmitted in cleartext; it was therefore possible, for an attacker who can sniff the network traffic, to read and use them to impersonate a legitimate client. Today I’ll show…
With great pleasure, I want to introduce you today the project of an Italian startup: 4zerobox. 4zerobox is a module, DIN-rail mountable (9 modules), designed to complement or replace a classic PLC in industrial automation applications. As the name suggests, the features of 4zerobox can help companies interested in implementing Industry 4.0 solutions. 4zerobox is a project…
In today’s post I’ll show you how to interface the esp32 chip to a GPS receiver to receive the actual position, speed and more… GPS receiver On the Internet and in electronic stores you can find different GPS receivers… thanks to the spread of navigators, smartphones and multicopters you can now buy one for few euros. For…
UART (Universal Asynchronous Receiver-Transmitter) is an hardware peripheral which allows serial, asynchronous communication with configurable data format and speed. The UART interface usually works at logic level: the electric signals are generated by an external circuit, following the standards of the communication bus you chose. For example the classical “serial port” of many personal computers is based…
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…