UKHAS badge board with RFM22, Arduino328 with 8Mhz external crystal (no brownout) running off a 1.8v MCP1700 regulator, 2.5V 10F supercap in parallel to badge board. Charged initially by 3.7v lipo to 1.8v and then this supply is removed either to run off the supercap or the solar panel.

• 50baud, 1 string every minute, under a lamp indoors
  • Just Cap = 5mins 36secs
  • Solar Cell = 18mins 49secs
• 300baud, 1 string every minute, under a lamp indoors
  • Just Cap = 12mins 21secs
  • Solar Cell = Continuous

• 2.5v regulator then supercap and then 1.8v reg to the board - this would exploite more of the supercap as we'd get the drop from 2.5v down to 1.6 rather than 1.8 to 1.6v.
• Boost regulator between supercap and board so we could use all the supercap.
• Tighter powersaving