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HID-Relay
Arduino project to convert wired USB HID device to Bluetooth (pipes USB HID reports out through a Bluetooth HID module)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
This project combining some cheap off the shelf modules looks like a good start, https://github.com/juancgarcia/HID-Relay, https://www.youtube.com/watch?v=5qXv7TJI324
NOTE:
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Hence, a higher number means a more popular project.