Emboldened by my past success with the Roomba revision D boards, I decided to incorporate this new knowledge of reflow into the next revision for the keyboard toy.  A few things needed to change with this design.  First, I never did find a good way to incorporate the port expander into the final design; so out it went.  Second, the wire harness proved much too cumbersome–I would use a simple female header instead for the TFT.  Third, to save space, I would use the TQFP-32 package for the ATMega328p.   Continue reading Reflow soldering: further experiments and observations →