![AVR Keyboard Toy rev B, reflow finished](http://142.93.194.197/wp-content/uploads/2016/12/WP_20161212_12_46_03_Pro-e1481571559805-1-169x300.jpg)
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