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Which output should be preferred - RS485 OR 4-20ma OR 0-5V OR 0-10V?

All of these will probably work for your particular application. Here are some thoughts on each. Would have made this a comment, but would probably exceed length limits. RS485: For this application, ...
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Sensor suggestions for accurate drone speed testing

Here's an alternative solution to what you're shown. Create a way of having a bright point light from the drone. Have a way where you take two pictures that captures this point of light from the drone....
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Are there any IoT outdoor lighting sensors?

More than 5 years after the original question was asked... The best answer in 2022 for me has been the Xiaomi Mi light detection sensor which uses Zigbee 3.0. This can easily be added to a Home ...
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