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Good project, i did something similar with a cheap keychain flashlight. Please use a diode in series with the solar panel. That provides 2 things:1. Protect the solar panel under low light conditions2. Avoids battery discharge!
Max distance of I2C depends of cable capacitance, not cable length, so it could be longer or shorter than 35 meters.
Hi! In the last page are the schematics and source code, or if you like, visit http://absolutelyautomation.com, in a single page are contained the written article, schematics and source code
If you don't main wait for a mont, you can but a PIR sensor from china for less than a $1 US dollar! http://s.click.aliexpress.com/e/yNRZrr3
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