Added 2017-2018 mars rover repository.

OSU Robotics Club/Mars Rover 2017-2018/electrical/documents/nodes/science.md

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+Science Node
+============
+
+![Science](files/Science.PNG)
+
+Designed by Anthony Grana.
+
+Summary
+-------
+
+Made for the science end affector for the 2018 rover. Powers, and
+comunicates with the [Soil
+Probe](https://www.fondriest.com/pdf/stevens_hydra_manual.pdf) via
+RS-485. Uses simple logic to power a drill motor (24V,5A, full forward,
+full back, stop). Outputs 5V to power a [digital
+camera.](https://www.amazon.com/Canon-PowerShot-Stabilized-2-7-Inch-Black/dp/B0035FZJJ4)
+Sends a signal to the didgital camera to control shoot and zoom.
+
+### Bill of Materials
+
+[Bill of
+Materials V1.1](https://docs.google.com/spreadsheets/d/1dY48bTzPCWO-qP4mQwElCYWBNv3Bg6SGOoxIt3NPqik/edit?usp=sharing)
+
+#### Design Files
+
+[Science node on circuit
+maker](https://workspace.circuitmaker.com/Projects/Details/Anthony-Grana/Sience-Node)
+
+[V1.1](files/SienceNode.Zip)
+
+### Known Issues
+V1.1
+
+1. The Drill motor controller will pull 5A but the curent power connector for the board can only handle 3A.
+2. For both RS 485 chips, the RX and TX pins need to be reversed.
+3. The RS 485 for the soil sensor is connected to the CAN RX TX instead of the Serial RX TX.
+
+V1.2
+
+No Known Issues