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I might suggest that instead of lashing the whole bundle of sticks together, you just lash 3 to make a tripod. The other sticks can then be added to the framework one at a time. That is how you set up the framework for a teepee. See https://www.wikihow.com/Make-a-Teepeefor a reference
I'm in the process of building something similar to track the water depth in my sump pump catch basins. My plan is to replace the display with a connection to a board that I can use to log data to the cloud.By the way, SparcFun sells a Pro Micro that has a USB Port. Earlier this year the were on sale for $9.95.