The popular IoT platform ThingsBoard has many options for integrating data from other systems. On the blog, we have already described the methods of the Pull model using a custom HTML widget that periodically retrieves the latest data from Watmonitor, as well as a form of direct writing of device telemetry to ThingsBoard from the Node-RED tool...

Node-RED is a tool that enables data acquisition, transformation and visualization in real time. It is designed as a low-code platform for creating event-driven applications. The basic principle is to compose blocks (nodes) into flows that provide the required automation. It is used not only in small projects, but also in large scalable industrial...

Today, we're excited to showcase the integration of the Watmonitor project (a smart level meter) with ThingsBoard – a powerful open-source IoT (Internet of Things) platform trusted by both hobbyists and enterprises for industrial and corporate applications.

Watmonitor is a web interface for a water level meter (PHP application) that allows you to collect data from a sensor node. which performs measurements in a dug, drilled well, or retention tank, cesspool. This universal web interface is also suitable for measuring and visualizing the height of bulk materials. It can be used with any DIY sensor or...

If you are using Watmonitor (a web interface for a level meter) from Your-IoT to measure the water level in a well, retention tank, or measure the height of bulk materials in a silo, storage tank, you may have encountered a limitation of Watmonitor if you wanted to use multiple sensor nodes. Each instance of the Watmonitor interface is tied...

Watmonitor is a universal web interface for a water level meter that allows you to collect data from a sensor node that sends a differential or total water level at regular intervals, depending on the sensor used (ultrasonic, radar, pressure, capacitive, optical, doppler, inductive). Each sensor has its advantages and disadvantages in terms of use...

LoRa is a technology for transmitting data over long distances, which also excels in its resistance to interference or data transmission even through obstacles, where other technologies would fail. LoRa is excellent for use where we do not have WiFi or another form of internet connection and we want to transmit data. Today we will show a LoRa...

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...

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...

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...

The WiFi thermostat project was originally created for the ESP8266 WiFi microcontroller platform from Espressif as equivalent to the Ethernet thermostat, which was built on the AVR microcontroller ATmega328P used in Arduino UNO, on which an Ethernet shield can be slid. The thermostat allows control of the GPIO output based on the measured...

The ESP32 microcontroller can be programmed in various development environments. Arduino IDE is one of the most popular, mainly due to easy program implementation even for beginners. However, there is also the ESP-IDF framework from Espressif Systems, which manufactures these microcontrollers. It allows closer access to the physical layer of the...

The WiFi thermostat project for the ESP8266 microcontroller was originally created similar to a room thermostat, which is controlled automatically with its data - i. target temperature and hysteresis. Automated control is used especially during the autumn, winter and early spring months. However, during the summer, the thermostat is switched off...

Domination Timer is a device - a stopwatch with a second resolution that allows you to measure the time (time) of a point occupied. The stopwatch has two times for 2 teams playing against each other, visualizing them on the LCD character display. Time is always added to only one of the teams, or not to one if the point (DOMINATOR) is neutral. ...