VoltJots | Electronics and IoT

Issue 57

Author

VoltJots
September 04, 2025

Welcome to the latest edition of the VoltJots newsletter, linking you to the very best electronics and IoT news, products, and projects.

Hope you enjoy! Until next week,

VoltJots

NEWS & ARTICLES

A team of chemists has created a promising electrochemical technique for extracting lithium from old lithium-iron-phosphate batteries, potentially providing an economical and environmentally friendly solution as electric vehicle adoption continues to rise.

Every engineer's project can become a business, but transitioning requires more than coding skills; understanding market needs, protecting intellectual property, and setting up a business structure are crucial for turning your ideas into sustainable products.

Combining YOLOv5’s fast object detection with SORT tracking, this AI system identifies and follows pedestrians frame by frame to help autonomous vehicles respond smoothly and safely.

Researchers are replacing silicon with gallium-doped indium oxide to create transistors that boost electron mobility, paving the way for efficient, high-density electronic components vital for big data and AI applications.

Despite new competitors boasting better specs, Raspberry Pi's reliable software, active community, and consistent updates make it the superior single-board computer choice in 2025, proving that ecosystem matters more than raw hardware performance.

The 1975 MOS Technology 6502 processor, developed by former Motorola engineers, broke price barriers in computing, enabling devices like the Apple II and Atari 2600, and laid the groundwork for today’s RISC architectures.

PROJECTS & TUTORIALS

Learn to build a web server on the ESP32 that serves HTML and CSS from LittleFS. LittleFS offers a straightforward way to manage files on microcontrollers, particularly the ESP32, letting you create, store, and access data without external devices.

Here’s a seriously extensive guide from TI on building humanoid and mobile robots; it includes sections on motor drive design, communications, computing, perception sensing, and functional safety. It's not a two-minute read, but one you should definitely bookmark.

Create a simple three-band active audio equalizer circuit with the TL072 IC, which will allow you to adjust bass, midrange, and treble frequencies for better sound quality before amplification. Build it on a PCB (Gerber files provided) or stick it on a breadboard (as demonstrated in video).

Learn about the PioT Project, a unique Raspberry Pi-based farm automation system that’s entirely self-hosted, offering tailored solutions for irrigation and data management while thriving in challenging environments without external dependencies.

Discover how to create an STM32 DSP audio processing and synthesis board, including hardware design tips, generating manufacturing files, placing PCBA orders, and programming with the STM32Cube IDE for sound projects like MIDI and WAV players.

Flockr runs a TensorFlow Lite AI model on the Particle Tachyon to identify bird species right on the device, no internet needed for classification. It streams live video and results over 5G from a battery-powered setup, letting you watch birds remotely via a web page.

PRODUCTS

Check out this ESP32 Bluetooth streamer that holds up to 1000 stations, connects to any Bluetooth audio device, uses an 18650 battery, and has built‑in charging. It'll also operate from USB‑C without the battery.

Featuring a Raspberry Pi RP2350B MCU, the RP2350-Relay-6CH delivers six isolated relays rated for 10A at 250VAC or 30VDC each. It integrates RS485 for Modbus communication, accepts wide DC input, and includes a DIN-rail enclosure plus USB-C for firmware drag-and-drop updates.

Connect Prophesee’s ultra-efficient GenX320 event-based vision sensor directly to your Raspberry Pi 5 and build real-time vision applications using their open-source Metavision SDK and OpenEB core, designed for robotics, drones, and more.

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