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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 sensitive. Switch on for a minimum of 20ms and the solenoid will rotate 35 degrees. Switch off and the return spring will rotate the output shaft back to the start position. Thanks
If you don't have experiences in using "normal" transistors take an "intelligent" transistor (for example Philips: TOPFET, Infineon: TEMPFET or PROFET, International Rectifier: Smart Power MOSFETs) which can switch the current (see the valve's datasheet or use an ampmeter). You can control it direct by your micro's port. See http://www.aufzu.de for links to manufacturers and distributors. Good luck!
You may also want to take into account that most 8051 uC's have I/O ports set to HIGH upon powering up, which may turn on the transistor for a brief moment before you get a chance to write a zero to the port.