Design and build a spin coater

I describe how I designed and built a spincoater, and how you can use a similar motor control system in your own projects. Firmware with I2C and Arduino library .
Video related to Chips & Tips article by Gurucharan V. Karnad, R. N. Ninad and V. Venkataraman showing how to create a spin coater for polymer-based .
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HDD Seagate 40GB 7200 rpm.