Project Overview: This project is an enhanced LED blinking circuit that goes beyond a simple 555 timer-based design. It incorporates additional features such as random blinking patterns, speed control, and a start/stop function. The project utilizes a microcontroller, such as an Arduino or Raspberry Pi, to control the blinking patterns, speed, and start/stop functionality. LED Blinking: The board features a total of 8 LEDs that blink in various random patterns. When the board is powered on, even before user interaction, the LEDs start blinking randomly, creating an eye-catching display. Each LED has its own current-limiting resistor to ensure proper current flow and prevent damage. The microcontroller is programmed to generate random blinking patterns for the LEDs, ensuring that the LEDs do not blink in a predictable or sequential order. This random blinking adds an element of unpredictability and visual interest to the project. Speed Control: The board includes two speed control buttons that allow the user to adjust the blinking speed of the LEDs. Button 1 is designated as the "fast" button, increasing the blinking speed when pressed, while Button 2 is designated as the "slow" button, decreasing the blinking speed when pressed. The speed control provides a range of blinking speeds, from a slow, gradual blink to a rapid, strobe-like effect. The microcontroller monitors the state of the speed control buttons and adjusts the blinking speed accordingly. Start/Stop Functionality: A third button serves as a start/stop control. When pressed, it toggles the blinking of the LEDs on or off. This allows the user to freeze the blinking pattern at any desired moment or resume the blinking when desired. The microcontroller handles the start/stop functionality by turning the LEDs on or off based on the state of the start/stop button. Manual Speed Adjustment: In addition to the speed control buttons, the board includes a potentiometer or variable resistor. This component allows the user to manually adjust the blinking speed of the LEDs by turning the knob or sliding the control. The manual speed adjustment provides more precise and customizable control over the blinking speed compared to the preset speeds of the buttons. The microcontroller reads the analog value from the potentiometer and adjusts the blinking speed accordingly. Power and Connectivity: The board is powered through a USB-C or USB-micro B connector, allowing it to be easily connected to a power source such as a computer or wall adapter. A voltage regulator may be included to ensure a stable and appropriate voltage supply to the components. A power switch is incorporated to conveniently turn the board on or off.

The Qwiic PC Fan Controller allows you easily control almost any PC fan over the Qwiic bus using the on board ATtiny microcontroller and control firmware. The control firmware monitors the tachometer output of the fan in order to implement PI Control over the fan speed, allowing you to set your desired speed in real units.

The TUSB8041 by Texas Instruments is a highly integrated four-port USB 3.0 hub controller designed to facilitate high-speed data transfers and power management in computer systems, docking stations, monitors, and set-top boxes. This component offers simultaneous SuperSpeed USB (5 Gbps), high-speed (480 Mbps), full-speed (12 Mbps), and low-speed (1.5 Mbps) data connections, ensuring backward compatibility with USB 2.0 and USB 1.x devices. Key features include multi-transaction translation with four transaction translators, asynchronous endpoint buffers for improved data management, and comprehensive battery charging support compliant with various standards including CDP, DCP, and Chinese Telecommunications Industry Standard YD/T 1591-2009. Flexible power management options are available, catering to both per-port and ganged power control configurations, alongside over-current protection mechanisms. The device also supports custom configurations via OTP ROM, serial EEPROM, or I2C/SMBus interfaces, enabling customization for vendor IDs, product IDs, port specifics, and string descriptors. Ease of integration is further enhanced with the ability for on-board and in-system OTP/EEPROM programming via the USB 2.0 upstream port, and the device requires no special drivers, operating seamlessly with any OS that supports USB. Packaged in a compact 64-pin QFN format, the TUSB8041 is offered in both commercial (0℃ to 70℃) and industrial temperature (-40℃ to 85℃) ranges, ensuring robust performance across diverse environmental conditions. With a single clock input requirement and comprehensive system resource support, the TUSB8041 is ideal for developers aiming to implement high-performance and reliable USB hubs in their designs.

a solar battery BMS for a DIY battery bank consiting of 20 12V, 200Ah LiFEPO4 batteries in a 4S5P configuration. The BMS should integrate with a Victron SmartShunt monitor for voltage and current readings as well as DIY bank voltage monitors that measure and publish to an MQTT server. The Victron data is also available on the MQTT server. The BMS should add an RS485 port for communicating with Fortress Power Inverters to communicate battery health, charge state, voltage, and other required metrics.

The TUSB8041, developed by Texas Instruments, is a four-port USB 3.0 hub intended for use in computer systems, docking stations, monitors, and set-top boxes, providing simultaneous SuperSpeed USB and high-speed/full-speed connections on the upstream port as well as on the downstream ports. This component supports battery charging features, enabling Charging Downstream Port (CDP) and Dedicated Charging Port (DCP) modes, compliant with the Chinese Telecommunications Industry Standard YD/T 1591-2009, and introduces an automatic mode for transparent support for BC devices and devices supporting Divider Mode charging solutions. It offers customization through OTP ROM, I2C EEPROM or via an I2C/SMBus slave interface for Vendor ID (VID), Product ID (PID), port customizations, and manufacturer and product strings. The TUSB8041 comes in a 64-pin RGC package and is available in both commercial (0°C to 70°C) and industrial (-40°C to 85°C) temperature ranges, part numbers TUSB8041 and TUSB8041I respectively, with an operating voltage requirement of 3.3V for I/O and 1.1V for the core. This hub doesn't require special drivers as it's designed to work seamlessly with any operating system supporting the USB stack, making it a highly adaptable solution for expanding USB connectivity in a wide range of applications.