Arduino, ESP8266, ESP32 related BLOG

WM_Mini (Watmonitor Mini) is a small PCB measuring 30 x 28.6 mm. It has two mounting holes with a diameter of 3 mm, a communication bus with two data channels and 3V3 power supply. As well as a 2-pin interface for connecting an external 5V power supply for recharging the battery (external power supply, solar panel), while it can...

The MAX98357 mono amplifier is very popular with the Arduino community. It is a reliable module that can be easily connected to the I2S (Inter-IC Sound) audio interface, which is available for example in ESP32-WROOM-32, ESP32-S, or ESP32-S3 and others. Of course, to play sounds, we also need a speaker. I have good experience with 2W and 3W speaker...

I decided to build an injector tester. It will allow the system to inject into measuring cylinders, where differences in the amount of fuel will be visible if an injector does not give the required dose. In this section, we will look at the selected components and in the next section we will show whether the system works or...

The PN532 RFID reader is a popular NFC reader operating at 13.56 MHz. It is popular mainly because it exists in the form of a module that is compatible with Arduino or other open-source hardware. The most famous is the V3 version of this reader, which was brought by ELECHOUSE (a manufacturer from Hong Kong) and can currently be found...

In May 2023, the design of the PCB (printed circuit board) for the RFID DOMINATOR 2.0 stopwatch, which is intended mainly for Airsoft or Paintball games with the DOMINATION game mode, saw the light of day. Subsequently, in August 2023, physical PCB samples from JLCPCB were also released. It was an upgrade of the original version 1.0, which fixed...

Today I would like to present the water level meter IoT monitoring project (Watmonitor), which consists of a web application and sensor nodes, which are formed by a microcontroller and transmission technology that allows the transmission of measured data from ultrasonic distance sensors. The web application allows to record data from the sensor...

Today we will show you the possibility of uploading a compiled program - the so-called machine code into Arduino that is unreadable to the average user. However, it contains instructions that the microcontroller executes. The main advantage of machine code is that it can be uploaded to Arduino by anyone who has access to it without having libraries...

Secure Boot is a method of securing the boot process for ESP32 microcontrollers against untrusted firmware and bootloader, which can be physically loaded into flash memory via the UART interface or in an update. Secure Boot combines the method of verifying the digital signature of the firmware in the boot process and also in the process of remote...