how to control a solenoid valve ?

Hello Everyone! Anyone would like to tell me a easy way to control a solenoid valve by a microprocessor? This solenid valve need to connect the leads to a power source(24VDC). It is not polarity...
how to control a solenoid valve ?

Hello Everyone! Anyone would like to tell me a easy way to control a solenoid valve by a microprocessor? This solenid valve need to connect the leads to a power source(24VDC). It is not polarity...
i am working on rotary encoders to get data of the encoder and send it serially to the controller.

Please I am new with rotary encoder so please i need help in processing the data received from the encoder how to process this data in gray code form....
i am working on rotary encoders to get data of the encoder and send it serially to the controller.

Please I am new with rotary encoder so please i need help in processing the data received from the encoder how to process this data in gray code form....
using the rotary encoder as an input device

i am searching for 'C' code for using the rotary encoder to input 4 digits and save them , then comapare the input code with a saved one. i wish if any one can help waled