After watching people build loggers based on the plans I released last year, I realized that simply learning to solder was the biggest challenge they faced. So I reconfigured the basic logger design to use crimped jumpers: 2016 ProMini Build Update

The changes bring the platform in under $10, and reduce the assembly time below 2 hours (for me). The students still need about 6 hours to assemble a platform from scratch, but I figure that is pretty good for folks with no experience.