Single phase and three phase Induction Motor control arduino

Question

How do I control AC single phase 1/2hp @230v induction motor with arduino? Microcontroller should turn ON motor when water in a tank reaches below certain level and it should turn OFF motor when water in tank reaches above certain level. 
 
 How to interface AC single phase as well as three phase induction motor with arduino or any other Microcontroller?

robogary · Answer

Use a small pilot relay driven by the Arduino to drive the coil of a bigger relay or contactor that feeds the power to the pump. Either relay is likely to be an industrial rated component. 
 Some type of level switch, float switch, or sonic sensor can be used to feed the tank level into Arduino. 
 As Doug stated, if the application is a as simple as stated like a sump pump, a controller isnt needed,

Single phase and three phase Induction Motor control arduino

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