Limor sent this wonderful little document my way after we had some problems with a 0.4mm pitch footprint I made, just to see if we could improve the paste layer and reduce the bridging a bit: Root Cause Failure Analysis of Printed Circuit Board Assemblies. Despite the organization not being the best — a clearer separation of problems from potential solutions/recommendations would have been helpful — there’s a lot of useful information in here. It’s often easier to understand the kinds of problems you encounter working with fine-pitch devices looking at photos. Unfortunately, X-ray images of things like ‘ball-drop’ with BGA reflow aren’t easy to come by, nor post-mortem, sawed-in-half BGA packages, etc. If you’re fascinated by the many ways boards can die a premature death, this is a goldmine of info.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
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