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 So far all I've got the board doing it blinking a LED on and of at varying rates. But its a start, so come back regularly as I'll be updating the project every few weeks or so. 
 UPDATE:  So, major breakthrough today. Have successfully wired a relay to the Arduino to trigger the pump. Need to use a relay as the pump runs on 12V and the Arduino only on 5V or 3,5V. So have hooked up a 12V battery to the relay and pump and its
Moisture Sensor
Potentiometer
 I'm leaning slightly towards this approach for the moment as I've set up a Serial.println that and have adjusted the thresholds in the code so when the sensor is in a glass of water (maximum saturation) is says "too much water" when its in moist soi
 Next step is triggering the pump when the reading returns <300 "thirsty" and switching off when is reads "just right" with a failsafe for "too much water" >1000      
Circuit diagram
The housing
Finished, for now
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