Designing An Automated PCB Test System | Voltlog #475

In this captivating project, Voltlog takes us on a journey to revolutionize the testing and programming process for their VoltLink boards. Tired of the repetitive and time-consuming manual approach, they set out to design a semi-automated test and programming fixture called VoltHub7. The VoltLink, a reliable USB-to-Serial adapter designed to solve the inconsistencies of cheap alternatives, is a crucial component in Voltlog’s electronics design work.

However, manually testing and flashing each board one by one proved tedious and error-prone, leading to the need for an automated solution. Enter the VoltHub7, a ingenious system that combines a custom-designed USB hub and a Raspberry Pi Zero 2W. At the heart of the design lies the Microchip USB2517, a configurable 7-port USB 2.0 Hi-Speed hub controller, carefully chosen for its capabilities and minimal external circuitry requirements.

Voltlog meticulously crafted the USB hub PCB, incorporating features like power distribution switches, status LEDs, and multiple power input options for flexibility. The integration of the Raspberry Pi Zero 2W directly onto the PCB, with its GPIO interfacing with the hub controller, streamlines the setup and enhances reliability.

But the true innovation lies in the use of pogo pins to interface with the Pi Zero’s test pads, eliminating the need for fiddly micro-USB cables and ensuring a robust connection. Voltlog’s attention to detail in the mechanical design, ensuring precise component alignment and fit, is a testament to their commitment to excellence.

The assembly process, complete with a black soldermask and yellow silkscreen for a visually striking result, culminated in a successful power-on and initialization of the hub and Pi Zero. Voltlog’s joy at witnessing the seamless integration of the components is palpable, inviting viewers to share in their excitement.

With the VoltHub7 up and running, Voltlog demonstrated its capability to connect and flash six VoltLink boards simultaneously, a task that would have been significantly more time-consuming with manual intervention. The future holds the promise of a custom test jig, further streamlining the process and eliminating the need for individual USB cables.

Leave a Reply

Your email address will not be published. Required fields are marked *