I came across the term MQTT online and really liked the approach behind it. So, I treated myself to a small experimental setup, which I've described below. First, a few details about MQTT. About MQTT General Information MQTT governs communication between data sources and data sinks using a broker. Data Source Sources for…
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There is an expansion board with a motor driver for the NodeMCU V2. It allows two small motors (up to 1.2 Amperes) to be controlled via an L293DD motor driver. It is also possible to connect a stepper motor. Furthermore, it offers two separate connections for the power supply of the board and the motors. Most of the ESP pins are brought out with an additional ground/power pin, which makes connecting...
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I bought two almost identical 128×64 displays to test them. These are controlled via the Wire (I2C) bus. However, there are also variants for the SPI bus, which are not covered here. The two displays have only two obvious differences at first glance. First, they have different sized drill holes and...
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I still had two OLED displays from a test and was wondering what I could do with them. Since I've been experimenting with nodes with integrated displays lately, I was planning to give my old ESP8266 NodeMCU V3 a bit of a boost. I want to briefly outline the process here; don't hesitate to ask questions and leave a comment. ...
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Alongside the ESP Lora 32, I also ordered the smaller version. It's slightly cheaper (~€17), without an external antenna and about 2mm shorter. Apart from the network transmission strength, the two boards seem to differ only minimally. The Lora transmitter is also missing here. It just about fits on a breadboard, so that...
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PlatformIO is an environment for developing software for IoT devices. It runs on Linux, Mac, and Windows and supports various microcontroller platforms. Here, I will limit myself to installation on Windows.
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As always, there is a wealth of information online on how to configure the Arduino GUI. Therefore, I will be very brief here, and for more detailed information, please refer to the sources linked below. Board Manager The ESP 32 has made its way into the Board Manager quite some time ago. The steps for installation are outlined here briefly. …
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This is about a China import and not the official Uno WiFi. The board has a full Arduino Uno with an Atmega processor and an ESP8266 chip on board. Via DIP switches, the Uno can be connected to the USB, the ESP to the USB, or the ESP to the UNO. For operation, …
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I've found a new toy, the ESP32 with an on-board display. The ESP32 WiFi LoRa 433 board, with its white PCB, is a bit similar to the Atmel Butterfly, but only half the size. Especially if you want to operate more than one of these boards, it's still within an affordable range at around €20. It fits...
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The BH1750 is a light intensity measuring sensor. I am not using the sensor discretely, but on the GY-302 board. It is controlled via the I2C (Wire) bus. As the GY-302 board is operated at 5V, it is suitable for control via the Arduino Uno. Circuit Diagram The circuit is similar (see sketch) to that of other GY...
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