With a current consumption of only a few microamperes, this thermometer can operate for years on a single CR2032 battery—or indefinitely with a solar cell.

Main advantages of THEREMINO AUTOMATION LANGUAGE ● Simplicity: The language is easy to learn, with a small set of keywords. It runs on Windows 10/11. ● Versatility: It can handle a wide range of automation tasks, from simple control sequences to complex interactions with hardware. ● Flexibility: The system can be used with a variety of hardware components and systems, and can communicate with other applications via slots. ● Accessibility: It is designed for those who do not have in-depth knowledge of programming, allowing a wide range of users to implement their ideas. ● Open Source: The Theremino system is open source and free. In summary, this language is a powerful and accessible that can allow technology enthusiasts to bring their projects to life. It combines simplicity and versatility and can be a valuable tool for a wide variety of automation tasks. If you know the basics of programming and are not a professional programmer, this language is perfect for you.

In this tutorial, I am going to talk about the PC817 Optocoupler which is one of the most common and inexpensive 4-pin optocouplers.

This intriguing but festive Christmas-themed PCB gift card provides a feature-packed home automation interface thanks to its complementary mobile application (Android).

This innovative project is a robotic lion model made entirely using e-waste and recycled materials. It uses an ultrasonic sensor to detect nearby objects (within 2 meters), responds with a realistic roaring sound, and wagging tail movement through a servo motor. Designed to encourage sustainability and creative reuse of discarded electronics, this project blends environmental awareness with practical electronics and coding skills, making it perfect for student learning and STEM outreach.

BathButler is an open-source smart bath filling system that automatically controls hot and cold water valves to fill your bath to the perfect temperature and depth. It features a two-board architecture: an ESP32-S3 relay controller (Waveshare) handles valve control, temperature sensing, and safety logic, while the CrowPanel 1.28" Rotary Display provides an intuitive physical interface — just twist the knob to set your temperature, click to start. The system includes a real-time circular web dashboard accessible from any phone, Amazon Alexa voice control, over-the-air firmware updates, automatic WiFi setup with captive portal, and a flow rate calibration system for depth estimation without a level sensor. Safety features include overheat cutoff, watchdog timer, and valve protection. All interfaces share a common REST API + WebSocket backbone, with a Flutter mobile app in development.

eBUS Adapter Stick C6 is a reduced size version of previous highly demanded eBUS Adapter Shields and provides an interface to a 2-wire eBUS with galvanic isolation for enabling communication with an eBUS enabled heating, ventilation or solar system. With a size of 42 x 16 mm it is way smaller than the previous Shield versions, but still supports an USR-ES1 module being plugged onto it for having Ethernet access. Even better, with the upcoming firmware version for the ESP32-C6, it automatically scans the heating components and makes all data available via MQTT to e.g. Home Assistant with auto discovery of entities.

Shield for learning.

Project #15: Environment – Soil Moisture Sensor – Mk20

Project #28 – Sensors – Flame Sensor – Mk29

Project #15: Environment – SD – Mk28

A core board for use with a PMW3360 to connect 3V3 for use as a mouse.

Project #28 – Sensors – Barometer – Mk25

It's great what you can do with some modern workshop tools! I've created a DIY herb planter which is fully automated so that you can enjoy fresh herbs all year round with little maintenance! It might have become a bit Fallout-themed along the way!! I've used the very excellent Elecrow Growcube as the beating heart of this design: https://shrsl.com/4qit4

Project #15: Environment - AHT20 Temperature and Humidity - Mk35