{"id":120,"date":"2024-03-17T01:31:04","date_gmt":"2024-03-17T01:31:04","guid":{"rendered":"http:\/\/course.ece.cmu.edu\/~ece500\/projects\/s24-teamb8\/?p=120"},"modified":"2024-03-17T01:31:04","modified_gmt":"2024-03-17T01:31:04","slug":"carsons-status-report-for-march-16th-2024","status":"publish","type":"post","link":"http:\/\/course.ece.cmu.edu\/~ece500\/projects\/s24-teamb8\/2024\/03\/17\/carsons-status-report-for-march-16th-2024\/","title":{"rendered":"Carson’s Status Report for March 16th, 2024"},"content":{"rendered":"

Progress<\/h1>\n

This week I helped write some of the asynchronous backend code for the firmware (along with Gary) and did some preliminary energy harvesting tests with the solar panel. For the energy harvesting, I did some measurements of the solar panel to see if it would be viable. We purchased a solar panel small enough to fit on the band of the watch (23mm x 25mm) and tested it outside with a variety of resistances to find the optimal range for power output. Unfortunately, the weather was changing too quickly to do a complete test, but all measurements showed at least 5mW of power output, and one showed above 15mW. These numbers are incredibly high, and give us a considerable margin for losses should we decide to use a panel. To further test this idea, I built the ADP5090-based boost converter circuit and used it to power an LED. Simply pointing my phone’s flashlight at the solar panel from ~10cm away was enough to power the LED intermittently. This was very impressive. Again, I will need to do more thorough tests in the future, but this is a promising power source.<\/p>\n

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Pacing<\/h1>\n

This week I would’ve liked to get some more quantitative measurements of more sources, but I was very busy with other obligations. Next week I don’t have much to be working on, so I should be able to catch up on the testing.<\/p>\n

Planning<\/h1>\n

Next week, I will:<\/p>\n