Six years ago, Raspberry Pi founder Eben Upton set out to reignite programming in schools with a cheap, compact computing platform. Despite targeting students, his foundation's $35 computer captured the imaginations of tinkers worldwide, resulting in overwhelming demand. Interest was so high, that distributors Premier Farnell and RS buckled under the strain of preorders in February. The former outfit later said demand was 20 times greater than its supply, with orders hitting 700 a second at one point.