Requirement Charge USB devices by the sun Capture energy during the day even if target device is not plugged in Materials Switching Regulator $4 Solar panel $70 (1/3 of $200) – had these laying around – could have gone smaller USB hub ~$2 USB battery pack ~$10 wire to solar panel (included in panel) USB cable to […]
Updating an old bicycle with chalkboa...
Background 20 year-old Huffy 18-speed bike purchased at K-Mart for <$100. Requires new tires every 5 years. Path forward This bike was green and purple with pink brake lines. I initially considered putting stickers on it. I then remembered I had some old spray paint including blackboard paint. 15 minutes of spraying and […]
Backing up photos while traveling wit...
Problem Digital photographs can easily be lost while traveling due to theft, memory failure, or inadvertent erasure of a memory card. There are many devices designed specifically to make copies but don’t want to carry an additional device. Solution 1 – Local copy on iPad Simply copy the photos on a daily basis […]